diff --git a/ietf/doc/forms.py b/ietf/doc/forms.py
index f9b1024fe..a0a76e0c0 100644
--- a/ietf/doc/forms.py
+++ b/ietf/doc/forms.py
@@ -5,13 +5,16 @@
 import datetime
 import debug #pyflakes:ignore
 from django import forms
+from django.core.exceptions import ObjectDoesNotExist, ValidationError
 
 from ietf.doc.fields import SearchableDocAliasesField, SearchableDocAliasField
-from ietf.doc.models import RelatedDocument
+from ietf.doc.models import RelatedDocument, DocExtResource
 from ietf.iesg.models import TelechatDate
 from ietf.iesg.utils import telechat_page_count
 from ietf.person.fields import SearchablePersonsField
 
+from ietf.name.models import ExtResourceName
+from ietf.utils.validators import validate_external_resource_value
 
 class TelechatForm(forms.Form):
     telechat_date = forms.TypedChoiceField(coerce=lambda x: datetime.datetime.strptime(x, '%Y-%m-%d').date(), empty_value=None, required=False, help_text="Page counts are the current page counts for the telechat, before this telechat date edit is made.")
@@ -57,7 +60,7 @@ class NotifyForm(forms.Form):
         return ', '.join(addrspecs)
 
 class ActionHoldersForm(forms.Form):
-    action_holders = SearchablePersonsField(required=False)    
+    action_holders = SearchablePersonsField(required=False)
     reason = forms.CharField(
         label='Reason for change',
         required=False,
@@ -125,3 +128,77 @@ class AddDownrefForm(forms.Form):
             if v_err_refnorm:
                 v_err_refnorm_prefix = "There does not seem to be a normative reference to RFC " + rfc.document.rfc_number() + " by "
                 raise forms.ValidationError(v_err_refnorm_prefix  + v_err_refnorm)
+
+
+class ExtResourceForm(forms.Form):
+    resources = forms.CharField(widget=forms.Textarea, label="Additional Resources", required=False,
+                                help_text=("Format: 'tag value (Optional description)'."
+                                           " Separate multiple entries with newline. When the value is a URL, use https:// where possible.") )
+
+    def __init__(self, *args, initial=None, extresource_model=None, **kwargs):
+        self.extresource_model = extresource_model
+        if initial:
+            kwargs = kwargs.copy()
+            resources = initial.get('resources')
+            if resources is not None and not isinstance(resources, str):
+                initial = initial.copy()
+                # Convert objects to string representation
+                initial['resources'] = self.format_resources(resources)
+            kwargs['initial'] = initial
+        super(ExtResourceForm, self).__init__(*args, **kwargs)
+
+    @staticmethod
+    def format_resources(resources, fs="\n"):
+        # Might be better to shift to a formset instead of parsing these lines.
+        return fs.join([r.to_form_entry_str() for r in resources])
+
+    def clean_resources(self):
+        """Clean the resources field
+
+        The resources field is a newline-separated set of resource entries. Each entry
+        should be "<tag> <value>" or "<tag> <value> (<display name>)" with any whitespace
+        delimiting the components. This clean only validates that the tag and value are
+        present and valid - tag must be a recognized ExtResourceName and value is
+        validated using validate_external_resource_value(). Further interpretation of
+        the resource is performed int he clean() method.
+        """
+        lines = [x.strip() for x in self.cleaned_data["resources"].splitlines() if x.strip()]
+        errors = []
+        for l in lines:
+            parts = l.split()
+            if len(parts) == 1:
+                errors.append("Too few fields: Expected at least tag and value: '%s'" % l)
+            elif len(parts) >= 2:
+                name_slug = parts[0]
+                try:
+                    name = ExtResourceName.objects.get(slug=name_slug)
+                except ObjectDoesNotExist:
+                    errors.append("Bad tag in '%s': Expected one of %s" % (l, ', '.join([ o.slug for o in ExtResourceName.objects.all() ])))
+                    continue
+                value = parts[1]
+                try:
+                    validate_external_resource_value(name, value)
+                except ValidationError as e:
+                    e.message += " : " + value
+                    errors.append(e)
+        if errors:
+            raise ValidationError(errors)
+        return lines
+
+    def clean(self):
+        """Clean operations after all other fields are cleaned by clean_<field> methods
+
+        Converts resource strings into ExtResource model instances.
+        """
+        cleaned_data = super(ExtResourceForm, self).clean()
+        cleaned_resources = []
+        cls = self.extresource_model or DocExtResource
+        for crs in cleaned_data.get('resources', []):
+            cleaned_resources.append(
+                cls.from_form_entry_str(crs)
+            )
+        cleaned_data['resources'] = cleaned_resources
+
+    @staticmethod
+    def valid_resource_tags():
+        return ExtResourceName.objects.all().order_by('slug').values_list('slug', flat=True)
\ No newline at end of file
diff --git a/ietf/doc/mails.py b/ietf/doc/mails.py
index 8b2168cf7..d86b88597 100644
--- a/ietf/doc/mails.py
+++ b/ietf/doc/mails.py
@@ -672,3 +672,20 @@ def email_iana_expert_review_state_changed(request, events):
               dict(event=events[0], url=settings.IDTRACKER_BASE_URL + events[0].doc.get_absolute_url() ),
               cc = addrs.cc,
              )
+
+def send_external_resource_change_request(request, doc, submitter_info, requested_resources):
+    """Send an email to requesting changes to a draft's external resources"""
+    addrs = gather_address_lists('doc_external_resource_change_requested', doc=doc)
+    to = set(addrs.to)
+    cc = set(addrs.cc)
+
+    send_mail(request, list(to), settings.DEFAULT_FROM_EMAIL,
+              'External resource change requested for %s' % doc.name,
+              'doc/mail/external_resource_change_request.txt',
+              dict(
+                  doc=doc,
+                  submitter_info=submitter_info,
+                  requested_resources=requested_resources,
+                  doc_url=settings.IDTRACKER_BASE_URL + doc.get_absolute_url(),
+              ),
+              cc=list(cc),)
diff --git a/ietf/doc/models.py b/ietf/doc/models.py
index c43127aea..ba49b0741 100644
--- a/ietf/doc/models.py
+++ b/ietf/doc/models.py
@@ -922,8 +922,7 @@ class DocumentURL(models.Model):
     desc = models.CharField(max_length=255, default='', blank=True)
     url  = models.URLField(max_length=2083) # 2083 is the legal max for URLs
 
-class DocExtResource(models.Model):
-    doc = ForeignKey(Document) # Should this really be to DocumentInfo rather than Document?
+class ExtResource(models.Model):
     name = models.ForeignKey(ExtResourceName, on_delete=models.CASCADE)
     display_name = models.CharField(max_length=255, default='', blank=True)
     value = models.CharField(max_length=2083) # 2083 is the maximum legal URL length
@@ -931,6 +930,49 @@ class DocExtResource(models.Model):
         priority = self.display_name or self.name.name
         return u"%s (%s) %s" % (priority, self.name.slug, self.value)
 
+    class Meta:
+        abstract = True
+        
+    # The to_form_entry_str() and matching from_form_entry_str() class method are
+    # defined here to ensure that change request emails suggest resources in the
+    # correct format to cut-and-paste into the current textarea on the external
+    # resource form. If that is changed to a formset or other non-text entry field,
+    # these methods really should not be needed.
+    def to_form_entry_str(self):
+        """Serialize as a string suitable for entry in a form"""
+        if self.display_name:
+            return "%s %s (%s)" % (self.name.slug, self.value, self.display_name.strip('()'))
+        else:
+            return "%s %s" % (self.name.slug, self.value)
+
+    @classmethod
+    def from_form_entry_str(cls, s):
+        """Create an instance from the form_entry_str format
+
+        Expected format is "<tag> <value>[ (<display name>)]"
+        Any text after the value is treated as the display name, with whitespace replaced by
+        spaces and leading/trailing parentheses stripped.
+        """
+        parts = s.split(None, 2)
+        display_name = ' '.join(parts[2:]).strip('()')
+        kwargs = dict(name_id=parts[0], value=parts[1])
+        if display_name:
+            kwargs['display_name'] = display_name
+        return cls(**kwargs)
+
+    @classmethod
+    def from_sibling_class(cls, sib):
+        """Create an instance with same base attributes as another subclass instance"""
+        kwargs = dict()
+        for field in ExtResource._meta.get_fields():
+            value = getattr(sib, field.name, None)
+            if value:
+                kwargs[field.name] = value
+        return cls(**kwargs)
+
+class DocExtResource(ExtResource):
+    doc = ForeignKey(Document) # Should this really be to DocumentInfo rather than Document?
+
 class RelatedDocHistory(models.Model):
     source = ForeignKey('DocHistory')
     target = ForeignKey('DocAlias', related_name="reversely_related_document_history_set")
diff --git a/ietf/doc/utils.py b/ietf/doc/utils.py
index 1bda84dd9..76aa40ea5 100644
--- a/ietf/doc/utils.py
+++ b/ietf/doc/utils.py
@@ -29,7 +29,7 @@ from ietf.doc.models import DocEvent, ConsensusDocEvent, BallotDocEvent, IRSGBal
 from ietf.doc.models import TelechatDocEvent, DocumentActionHolder
 from ietf.name.models import DocReminderTypeName, DocRelationshipName
 from ietf.group.models import Role, Group
-from ietf.ietfauth.utils import has_role
+from ietf.ietfauth.utils import has_role, is_authorized_in_doc_stream, is_individual_draft_author
 from ietf.person.models import Person
 from ietf.review.models import ReviewWish
 from ietf.utils import draft, text
@@ -149,6 +149,11 @@ def can_unadopt_draft(user, doc):
     else:
         return False
 
+def can_edit_docextresources(user, doc):
+    return (has_role(user, ("Secretariat", "Area Director"))
+            or is_authorized_in_doc_stream(user, doc)
+            or is_individual_draft_author(user, doc))
+
 def two_thirds_rule( recused=0 ):
     # For standards-track, need positions from 2/3 of the non-recused current IESG.
     active = Role.objects.filter(name="ad",group__type="area",group__state="active").count()
@@ -1131,3 +1136,22 @@ def augment_docs_and_user_with_user_info(docs, user):
     for d in docs:
         d.tracked_in_personal_community_list = d.pk in tracked
         d.has_review_wish = d.pk in review_wished
+
+
+def update_doc_extresources(doc, new_resources, by):
+    old_res_strs = '\n'.join(sorted(r.to_form_entry_str() for r in doc.docextresource_set.all()))
+    new_res_strs = '\n'.join(sorted(r.to_form_entry_str() for r in new_resources))
+    
+    if old_res_strs == new_res_strs:
+        return False  # no change
+
+    doc.docextresource_set.all().delete()
+    for new_res in new_resources:
+        new_res.doc = doc
+        new_res.save()
+    e = DocEvent(doc=doc, rev=doc.rev, by=by, type='changed_document')
+    e.desc = "Changed document external resources from:\n\n%s\n\nto:\n\n%s" % (
+        old_res_strs, new_res_strs)
+    e.save()
+    doc.save_with_history([e])
+    return True
\ No newline at end of file
diff --git a/ietf/doc/views_draft.py b/ietf/doc/views_draft.py
index 89cc51a2c..f7ae4592c 100644
--- a/ietf/doc/views_draft.py
+++ b/ietf/doc/views_draft.py
@@ -13,7 +13,6 @@ from django import forms
 from django.conf import settings
 from django.contrib import messages
 from django.contrib.auth.decorators import login_required
-from django.core.exceptions import ValidationError, ObjectDoesNotExist
 from django.db.models import Q
 from django.http import HttpResponseRedirect, Http404
 from django.shortcuts import render, get_object_or_404, redirect
@@ -35,21 +34,22 @@ from ietf.doc.mails import ( email_pulled_from_rfc_queue, email_resurrect_reques
 from ietf.doc.utils import ( add_state_change_event, can_adopt_draft, can_unadopt_draft,
     get_tags_for_stream_id, nice_consensus, update_action_holders,
     update_reminder, update_telechat, make_notify_changed_event, get_initial_notify,
-    set_replaces_for_document, default_consensus, tags_suffix, )
+    set_replaces_for_document, default_consensus, tags_suffix, can_edit_docextresources,
+    update_doc_extresources )
 from ietf.doc.lastcall import request_last_call
 from ietf.doc.fields import SearchableDocAliasesField
+from ietf.doc.forms import ExtResourceForm
 from ietf.group.models import Group, Role, GroupFeatures
 from ietf.iesg.models import TelechatDate
-from ietf.ietfauth.utils import has_role, is_authorized_in_doc_stream, user_is_person, is_individual_draft_author
+from ietf.ietfauth.utils import has_role, is_authorized_in_doc_stream, user_is_person
 from ietf.ietfauth.utils import role_required
 from ietf.mailtrigger.utils import gather_address_lists
 from ietf.message.models import Message
-from ietf.name.models import IntendedStdLevelName, DocTagName, StreamName, ExtResourceName
+from ietf.name.models import IntendedStdLevelName, DocTagName, StreamName
 from ietf.person.fields import SearchableEmailField
 from ietf.person.models import Person, Email
 from ietf.utils.mail import send_mail, send_mail_message, on_behalf_of
 from ietf.utils.textupload import get_cleaned_text_file_content
-from ietf.utils.validators import validate_external_resource_value
 from ietf.utils import log
 from ietf.utils.response import permission_denied
 
@@ -1205,81 +1205,23 @@ def edit_consensus(request, name):
 
 
 def edit_doc_extresources(request, name):
-    class DocExtResourceForm(forms.Form):
-        resources = forms.CharField(widget=forms.Textarea, label="Additional Resources", required=False,
-            help_text=("Format: 'tag value (Optional description)'."
-                " Separate multiple entries with newline. When the value is a URL, use https:// where possible.") )
-
-        def clean_resources(self):
-            lines = [x.strip() for x in self.cleaned_data["resources"].splitlines() if x.strip()]
-            errors = []
-            for l in lines:
-                parts = l.split()
-                if len(parts) == 1:
-                    errors.append("Too few fields: Expected at least tag and value: '%s'" % l)
-                elif len(parts) >= 2:
-                    name_slug = parts[0]
-                    try:
-                        name = ExtResourceName.objects.get(slug=name_slug)
-                    except ObjectDoesNotExist:
-                        errors.append("Bad tag in '%s': Expected one of %s" % (l, ', '.join([ o.slug for o in ExtResourceName.objects.all() ])))
-                        continue
-                    value = parts[1]
-                    try:
-                        validate_external_resource_value(name, value)
-                    except ValidationError as e:
-                        e.message += " : " + value
-                        errors.append(e)
-            if errors:
-                raise ValidationError(errors)
-            return lines
-
-    def format_resources(resources, fs="\n"):
-        res = []
-        for r in resources:
-            if r.display_name:
-                res.append("%s %s (%s)" % (r.name.slug, r.value, r.display_name.strip('()')))
-            else:
-                res.append("%s %s" % (r.name.slug, r.value)) 
-                # TODO: This is likely problematic if value has spaces. How then to delineate value and display_name? Perhaps in the short term move to comma or pipe separation.
-                # Might be better to shift to a formset instead of parsing these lines.
-        return fs.join(res)
-
     doc = get_object_or_404(Document, name=name)
 
-    if not (has_role(request.user, ("Secretariat", "Area Director"))
-            or is_authorized_in_doc_stream(request.user, doc)
-            or is_individual_draft_author(request.user, doc)):
+    if not can_edit_docextresources(request.user, doc):
         permission_denied(request, "You do not have the necessary permissions to view this page.")
 
-    old_resources = format_resources(doc.docextresource_set.all())
-
     if request.method == 'POST':
-        form = DocExtResourceForm(request.POST)
+        form = ExtResourceForm(request.POST)
         if form.is_valid():
-            old_resources = sorted(old_resources.splitlines())
-            new_resources = sorted(form.cleaned_data['resources'])
-            if old_resources != new_resources:
-                doc.docextresource_set.all().delete()
-                for u in new_resources:
-                    parts = u.split(None, 2)
-                    name = parts[0]
-                    value = parts[1]
-                    display_name = ' '.join(parts[2:]).strip('()')
-                    doc.docextresource_set.create(value=value, name_id=name, display_name=display_name)
-                new_resources = format_resources(doc.docextresource_set.all())
-                e = DocEvent(doc=doc, rev=doc.rev, by=request.user.person, type='changed_document')
-                e.desc = "Changed document external resources from:\n\n%s\n\nto:\n\n%s" % (old_resources, new_resources)
-                e.save()
-                doc.save_with_history([e])
+            if update_doc_extresources(doc, form.cleaned_data['resources'], by=request.user.person):
                 messages.success(request,"Document resources updated.")
             else:
                 messages.info(request,"No change in Document resources.")
             return redirect('ietf.doc.views_doc.document_main', name=doc.name)
     else:
-        form = DocExtResourceForm(initial={'resources': old_resources, })
+        form = ExtResourceForm(initial={'resources': doc.docextresource_set.all()})
 
-    info = "Valid tags:<br><br> %s" % ', '.join([ o.slug for o in ExtResourceName.objects.all().order_by('slug') ])
+    info = "Valid tags:<br><br> %s" % ', '.join(form.valid_resource_tags())
     # May need to explain the tags more - probably more reason to move to a formset.
     title = "Additional document resources"
     return render(request, 'doc/edit_field.html',dict(doc=doc, form=form, title=title, info=info) )
diff --git a/ietf/name/fixtures/names.json b/ietf/name/fixtures/names.json
index 6195215f2..c2d4aa03f 100644
--- a/ietf/name/fixtures/names.json
+++ b/ietf/name/fixtures/names.json
@@ -3507,6 +3507,21 @@
     "model": "mailtrigger.mailtrigger",
     "pk": "doc_expires_soon"
   },
+  {
+    "fields": {
+      "cc": [],
+      "desc": "Recipients when a change to the external resources for a document is requested.",
+      "to": [
+        "doc_ad",
+        "doc_group_chairs",
+        "doc_group_delegates",
+        "doc_shepherd",
+        "doc_stream_manager"
+      ]
+    },
+    "model": "mailtrigger.mailtrigger",
+    "pk": "doc_external_resource_change_requested"
+  },
   {
     "fields": {
       "cc": [],
diff --git a/ietf/submit/admin.py b/ietf/submit/admin.py
index 05ee2480c..703ad5860 100644
--- a/ietf/submit/admin.py
+++ b/ietf/submit/admin.py
@@ -2,9 +2,12 @@
 from django.urls import reverse as urlreverse
 from django.contrib import admin
 from django.conf import settings
+from django import forms
 
+from ietf.submit.models import (Preapproval, Submission, SubmissionEvent, 
+    SubmissionCheck, SubmissionEmailEvent, SubmissionExtResource)
+from ietf.utils.validators import validate_external_resource_value
 
-from ietf.submit.models import Preapproval, Submission, SubmissionEvent, SubmissionCheck, SubmissionEmailEvent
 
 class SubmissionAdmin(admin.ModelAdmin):
     list_display = ['id', 'rev', 'draft_link', 'status_link', 'submission_date',]
@@ -48,4 +51,15 @@ admin.site.register(Preapproval, PreapprovalAdmin)
 
 class SubmissionEmailEventAdmin(admin.ModelAdmin):
     list_display = ['id', 'submission', 'time', 'by', 'message', 'desc', ]
-admin.site.register(SubmissionEmailEvent, SubmissionEmailEventAdmin)    
+admin.site.register(SubmissionEmailEvent, SubmissionEmailEventAdmin)
+
+class SubmissionExtResourceAdminForm(forms.ModelForm):
+    def clean(self):
+        validate_external_resource_value(self.cleaned_data['name'],self.cleaned_data['value'])
+
+class SubmissionExtResourceAdmin(admin.ModelAdmin):
+    form = SubmissionExtResourceAdminForm
+    list_display = ['id', 'submission', 'name', 'display_name', 'value',]
+    search_fields = ['submission__name', 'value', 'display_name', 'name__slug',]
+    raw_id_fields = ['submission', ]
+admin.site.register(SubmissionExtResource, SubmissionExtResourceAdmin)
diff --git a/ietf/submit/factories.py b/ietf/submit/factories.py
new file mode 100644
index 000000000..143634723
--- /dev/null
+++ b/ietf/submit/factories.py
@@ -0,0 +1,34 @@
+# Copyright The IETF Trust 2020, All Rights Reserved
+# -*- coding: utf-8 -*-
+
+
+import debug    # pyflakes:ignore
+import factory
+
+from ietf.doc.factories import draft_name_generator
+from ietf.name.models import ExtResourceName
+from ietf.submit.models import Submission, SubmissionExtResource
+from ietf.utils.accesstoken import generate_random_key
+
+
+class SubmissionExtResourceFactory(factory.DjangoModelFactory):
+    name = factory.Iterator(ExtResourceName.objects.all())
+    value = factory.Faker('url')
+    submission = factory.SubFactory('ietf.submit.factories.SubmissionFactory')
+
+    class Meta:
+        model = SubmissionExtResource
+
+class SubmissionFactory(factory.DjangoModelFactory):
+    state_id = 'uploaded'
+
+    @factory.lazy_attribute_sequence
+    def name(self, n):
+        return draft_name_generator('draft', getattr(self, 'group', None), n)
+
+    @factory.lazy_attribute
+    def auth_key(self):
+        return generate_random_key()
+
+    class Meta:
+        model = Submission
diff --git a/ietf/submit/migrations/0008_submissionextresource.py b/ietf/submit/migrations/0008_submissionextresource.py
new file mode 100644
index 000000000..be51e2c6d
--- /dev/null
+++ b/ietf/submit/migrations/0008_submissionextresource.py
@@ -0,0 +1,29 @@
+# Generated by Django 2.2.17 on 2021-01-27 12:23
+
+from django.db import migrations, models
+import django.db.models.deletion
+import ietf.utils.models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('name', '0020_add_rescheduled_session_name'),
+        ('submit', '0007_auto_20201109_0439'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='SubmissionExtResource',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('display_name', models.CharField(blank=True, default='', max_length=255)),
+                ('value', models.CharField(max_length=2083)),
+                ('name', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='name.ExtResourceName')),
+                ('submission', ietf.utils.models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='external_resources', to='submit.Submission')),
+            ],
+            options={
+                'abstract': False,
+            },
+        ),
+    ]
diff --git a/ietf/submit/models.py b/ietf/submit/models.py
index 3ecd06c13..4a09c0323 100644
--- a/ietf/submit/models.py
+++ b/ietf/submit/models.py
@@ -10,7 +10,7 @@ from django.db import models
 
 import debug                            # pyflakes:ignore
 
-from ietf.doc.models import Document
+from ietf.doc.models import Document, ExtResource
 from ietf.person.models import Person
 from ietf.group.models import Group
 from ietf.message.models import Message
@@ -167,3 +167,6 @@ class SubmissionEmailEvent(SubmissionEvent):
     class Meta:
         ordering = ['-time', '-id']
 
+
+class SubmissionExtResource(ExtResource):
+    submission = ForeignKey(Submission, related_name='external_resources')
\ No newline at end of file
diff --git a/ietf/submit/resources.py b/ietf/submit/resources.py
index 2d5d47308..bf4959f24 100644
--- a/ietf/submit/resources.py
+++ b/ietf/submit/resources.py
@@ -10,7 +10,7 @@ from tastypie.cache import SimpleCache
 
 from ietf import api
 from ietf.submit.models import ( Preapproval, SubmissionCheck, Submission,
-    SubmissionEmailEvent, SubmissionEvent )
+    SubmissionEmailEvent, SubmissionEvent, SubmissionExtResource )
 from ietf.person.resources import PersonResource
 
 
@@ -139,3 +139,23 @@ class SubmissionEmailEventResource(ModelResource):
         }
 api.submit.register(SubmissionEmailEventResource())
 
+
+
+from ietf.name.resources import ExtResourceNameResource
+class SubmissionExtResourceResource(ModelResource):
+    name             = ToOneField(ExtResourceNameResource, 'name')
+    submission       = ToOneField(SubmissionResource, 'submission')
+    class Meta:
+        queryset = SubmissionExtResource.objects.all()
+        serializer = api.Serializer()
+        cache = SimpleCache()
+        resource_name = 'submissionextresource'
+        ordering = ['id', ]
+        filtering = { 
+            "id": ALL,
+            "display_name": ALL,
+            "value": ALL,
+            "name": ALL_WITH_RELATIONS,
+            "submission": ALL_WITH_RELATIONS,
+        }
+api.submit.register(SubmissionExtResourceResource())
diff --git a/ietf/submit/tests.py b/ietf/submit/tests.py
index cba53cdf0..d04bc0cdb 100644
--- a/ietf/submit/tests.py
+++ b/ietf/submit/tests.py
@@ -9,7 +9,7 @@ import os
 import re
 import shutil
 import sys
-
+import mock
 
 from io import StringIO
 from pyquery import PyQuery
@@ -24,7 +24,7 @@ from ietf.submit.utils import expirable_submissions, expire_submission
 from ietf.doc.factories import DocumentFactory, WgDraftFactory, IndividualDraftFactory
 from ietf.doc.models import ( Document, DocAlias, DocEvent, State,
     BallotPositionDocEvent, DocumentAuthor, SubmissionDocEvent )
-from ietf.doc.utils import create_ballot_if_not_open
+from ietf.doc.utils import create_ballot_if_not_open, can_edit_docextresources
 from ietf.group.factories import GroupFactory, RoleFactory
 from ietf.group.models import Group
 from ietf.group.utils import setup_default_community_list_for_group
@@ -34,14 +34,15 @@ from ietf.message.models import Message
 from ietf.name.models import FormalLanguageName
 from ietf.person.models import Person
 from ietf.person.factories import UserFactory, PersonFactory, EmailFactory
-from ietf.submit.models import Submission, Preapproval
+from ietf.submit.factories import SubmissionFactory, SubmissionExtResourceFactory
+from ietf.submit.models import Submission, Preapproval, SubmissionExtResource
 from ietf.submit.mail import add_submission_email, process_response_email
+from ietf.utils.accesstoken import generate_access_token
 from ietf.utils.mail import outbox, empty_outbox, get_payload_text
 from ietf.utils.models import VersionInfo
 from ietf.utils.test_utils import login_testing_unauthorized, TestCase
 from ietf.utils.draft import Draft
 
-
 def submission_file(name, rev, group, format, templatename, author=None, email=None, title=None, year=None, ascii=True):
     # construct appropriate text draft
     f = io.open(os.path.join(settings.BASE_DIR, "submit", templatename))
@@ -217,7 +218,7 @@ class SubmitTests(TestCase):
 
         return status_url, author
 
-    def supply_extra_metadata(self, name, status_url, submitter_name, submitter_email, replaces):
+    def supply_extra_metadata(self, name, status_url, submitter_name, submitter_email, replaces, extresources=None):
         # check the page
         r = self.client.get(status_url)
         q = PyQuery(r.content)
@@ -225,19 +226,30 @@ class SubmitTests(TestCase):
         self.assertEqual(len(post_button), 1)
         action = post_button.parents("form").find('input[type=hidden][name="action"]').val()
 
-        # post submitter info
-        r = self.client.post(status_url, {
+        post_data = {
             "action": action,
             "submitter-name": submitter_name,
             "submitter-email": submitter_email,
             "replaces": replaces,
-        })
+            'resources': '\n'.join(r.to_form_entry_str() for r in extresources) if extresources else '',
+        }
+
+        # post submitter info
+        r = self.client.post(status_url, post_data)
 
         if r.status_code == 302:
             submission = Submission.objects.get(name=name)
             self.assertEqual(submission.submitter, email.utils.formataddr((submitter_name, submitter_email)))
-            self.assertEqual(submission.replaces, ",".join(d.name for d in DocAlias.objects.filter(pk__in=replaces.split(",") if replaces else [])))
-
+            self.assertEqual(submission.replaces, 
+                             ",".join(
+                                 d.name for d in DocAlias.objects.filter(
+                                     pk__in=replaces.split(",") if replaces else []
+                                 )
+                             ))
+            self.assertCountEqual(
+                [str(r) for r in submission.external_resources.all()],
+                [str(r) for r in extresources] if extresources else [],
+            )
         return r
 
     def extract_confirmation_url(self, confirmation_email):
@@ -457,6 +469,9 @@ class SubmitTests(TestCase):
     def test_submit_new_replaced_wg_as_author(self):
         self.submit_new_concluded_wg_as_author('replaced')
 
+    def test_submit_new_wg_with_extresources(self):
+        self.submit_new_draft_with_extresources(group=GroupFactory())
+
     def submit_existing(self, formats, change_authors=True, group_type='wg', stream_type='ietf'):
         # submit new revision of existing -> supply submitter info -> prev authors confirm
         if stream_type == 'ietf':
@@ -655,18 +670,33 @@ class SubmitTests(TestCase):
     def test_submit_existing_txt_preserve_authors(self):
         self.submit_existing(["txt"], change_authors=False)
 
+    def test_submit_existing_wg_with_extresources(self):
+        self.submit_existing_with_extresources(group_type='wg')
+
     def test_submit_existing_rg(self):
         self.submit_existing(["txt"],group_type='rg', stream_type='irtf')
 
+    def test_submit_existing_rg_with_extresources(self):
+        self.submit_existing_with_extresources(group_type='rg', stream_type='irtf')
+
     def test_submit_existing_ag(self):
         self.submit_existing(["txt"],group_type='ag')
 
+    def test_submit_existing_ag_with_extresources(self):
+        self.submit_existing_with_extresources(group_type='ag')
+
     def test_submit_existing_area(self):
         self.submit_existing(["txt"],group_type='area')
 
+    def test_submit_existing_area_with_extresources(self):
+        self.submit_existing_with_extresources(group_type='area')
+
     def test_submit_existing_ise(self):
         self.submit_existing(["txt"],stream_type='ise', group_type='individ')
 
+    def test_submit_existing_ise_with_extresources(self):
+        self.submit_existing_with_extresources(stream_type='ise', group_type='individ')
+
     def test_submit_existing_iab(self):
         self.submit_existing(["txt"],stream_type='iab', group_type='individ')
 
@@ -731,6 +761,9 @@ class SubmitTests(TestCase):
     def test_submit_existing_replaced_wg_as_author(self):
         self.do_submit_existing_concluded_wg_test(group_state_id='replaced', submit_as_author=True)
 
+    def test_submit_existing_iab_with_extresources(self):
+        self.submit_existing_with_extresources(stream_type='iab', group_type='individ')
+
     def submit_new_individual(self, formats):
         # submit new -> supply submitter info -> confirm
 
@@ -749,6 +782,8 @@ class SubmitTests(TestCase):
         r = self.client.get(status_url)
         self.assertEqual(r.status_code, 200)
         self.assertContains(r, "The submission is pending email authentication")
+        self._assert_extresources_in_table(r, [])
+        self._assert_extresources_form_not_present(r)
 
         self.assertEqual(len(outbox), mailbox_before + 1)
         confirm_email = outbox[-1]
@@ -786,6 +821,87 @@ class SubmitTests(TestCase):
     def test_submit_new_individual_txt_xml(self):
         self.submit_new_individual(["txt", "xml"])
 
+    def _assert_extresources_in_table(self, response, extresources, th_label=None):
+        """Assert that external resources are properly shown on the submission_status table"""
+        q = PyQuery(response.content)
+        
+        # Find the <th> that labels the resource list
+        th = q('th:contains("%s")' % (th_label or 'Submission additional resources'))
+        self.assertEqual(len(th), 1)
+        
+        # Find the <td> element that holds the resource list
+        td_siblings = th.siblings('td')
+        self.assertEqual(len(td_siblings), 1)
+        td = td_siblings.eq(0)
+        td_html = td.html()
+        
+        if extresources:
+            for res in extresources:
+                # If the value is present, that's good enough. Don't test the detailed format.
+                self.assertIn(res.value, td_html, 'Value of resource %s not found' % (res))
+        else:
+            self.assertIn('None', td_html)
+
+    def _assert_extresources_form(self, response, expected_extresources):
+        """Assert that the form for editing external resources is present and has expected contents"""
+        q = PyQuery(response.content)
+        
+        # The external resources form is currently just a text area. Find it by its ID and check
+        # that it has the expected contents.
+        elems = q('form textarea#id_resources')
+        self.assertEqual(len(elems), 1)
+        
+        text_area = elems.eq(0)
+        contents = text_area.text()
+        if len(expected_extresources) == 0:
+            self.assertEqual(contents.strip(), '')
+        else:
+            res_strings = [rs for rs in contents.split('\n') if len(rs.strip()) > 0]  # ignore empty lines
+            self.assertCountEqual(
+                res_strings,
+                [r.to_form_entry_str() for r in expected_extresources],
+            )
+
+    def _assert_extresources_form_not_present(self, response):
+        q=PyQuery(response.content)
+        self.assertEqual(len(q('form textarea#id_resources')), 0)
+        
+    def _assert_extresource_change_event(self, doc, is_present=True):
+        """Assert that an external resource change event is (or is not) present for the doc"""
+        event = doc.latest_event(type='changed_document', desc__contains='Changed document external resources')
+        if is_present:
+            self.assertIsNotNone(event, 'External resource change event was not created properly')
+        else:
+            self.assertIsNone(event, 'External resource change event was unexpectedly created')
+
+    def submit_new_draft_with_extresources(self, group):
+        name = 'draft-testing-with-extresources'
+
+        status_url, author = self.do_submission(name, rev='00', group=group)
+
+        # Check that the submission starts with no external resources
+        r = self.client.get(status_url)
+        self.assertEqual(r.status_code, 200)
+        self._assert_extresources_in_table(r, [])
+        self._assert_extresources_form(r, [])
+
+        resources = [
+            SubmissionExtResource(name_id='faq', value='https://faq.example.com/'),
+            SubmissionExtResource(name_id='wiki', value='https://wiki.example.com', display_name='Test Wiki'),
+        ]
+        r = self.supply_extra_metadata(name, status_url, 'Submitter name', 'submitter@example.com', replaces='',
+                                       extresources=resources)
+        self.assertEqual(r.status_code, 302)
+        status_url = r['Location']
+        
+        r = self.client.get(status_url)
+        self.assertEqual(r.status_code, 200)
+        self._assert_extresources_in_table(r, resources)
+        self._assert_extresources_form_not_present(r)
+
+    def test_submit_new_individual_with_extresources(self):
+        self.submit_new_draft_with_extresources(group=None)
+
     def submit_new_individual_logged_in(self, formats):
         # submit new -> supply submitter info -> done
 
@@ -808,6 +924,8 @@ class SubmitTests(TestCase):
         r = self.client.get(status_url)
         self.assertEqual(r.status_code, 200)
         self.assertContains(r, "New version accepted")
+        self._assert_extresources_in_table(r, [])
+        self._assert_extresources_form_not_present(r)
 
         self.assertEqual(len(outbox), mailbox_before+2)
         announcement_email = outbox[-2]
@@ -821,9 +939,11 @@ class SubmitTests(TestCase):
 
         draft = Document.objects.get(docalias__name=name)
         self.assertEqual(draft.rev, rev)
+        self.assertEqual(draft.docextresource_set.count(), 0)
         new_revision = draft.latest_event()
         self.assertEqual(new_revision.type, "new_revision")
         self.assertEqual(new_revision.by.name, author.name)
+        self._assert_extresource_change_event(draft, is_present=False)
 
         # Check submission settings
         self.assertEqual(draft.submission().xml_version, "3" if 'xml' in formats else None)
@@ -834,6 +954,43 @@ class SubmitTests(TestCase):
     def test_submit_new_logged_in_xml(self):
         self.submit_new_individual_logged_in(["xml"])
 
+    def test_submit_new_logged_in_with_extresources(self):
+        """Logged-in author of individual draft can set external resources"""
+        name = 'draft-individual-testing-with-extresources'
+        author = PersonFactory()
+        username = author.user.email
+        
+        self.client.login(username=username, password=username+'+password')
+        status_url, author = self.do_submission(name, rev='00', author=author)
+
+        # Check that the submission starts with no external resources
+        r = self.client.get(status_url)
+        self.assertEqual(r.status_code, 200)
+        self._assert_extresources_in_table(r, [])
+        self._assert_extresources_form(r, [])
+
+        resources = [
+            SubmissionExtResource(name_id='faq', value='https://faq.example.com/'),
+            SubmissionExtResource(name_id='wiki', value='https://wiki.example.com', display_name='Test Wiki'),
+        ]
+        r = self.supply_extra_metadata(name, status_url, author.name, username, replaces='',
+                                       extresources=resources)
+        self.assertEqual(r.status_code, 302)
+        status_url = r['Location']
+
+        r = self.client.get(status_url)
+        self.assertEqual(r.status_code, 200)
+        self._assert_extresources_in_table(r, resources)
+        self._assert_extresources_form_not_present(r)
+
+        # Check that the draft itself got the resources        
+        draft = Document.objects.get(docalias__name=name)
+        self.assertCountEqual(
+            [str(r) for r in draft.docextresource_set.all()],
+            [str(r) for r in resources],
+        )
+        self._assert_extresource_change_event(draft, is_present=True)
+
     def test_submit_update_individual(self):
         IndividualDraftFactory(name='draft-ietf-random-thing', states=[('draft','rfc')], other_aliases=['rfc9999',], pages=5)
         ad=Person.objects.get(user__username='ad')
@@ -844,23 +1001,36 @@ class SubmitTests(TestCase):
         rev = '%02d'%(int(draft.rev)+1)
         status_url, author = self.do_submission(name,rev)
         mailbox_before = len(outbox)
+
         replaced_alias = draft.docalias.first()
         r = self.supply_extra_metadata(name, status_url, "Submitter Name", "author@example.com", replaces=str(replaced_alias.pk))
         self.assertEqual(r.status_code, 200)
         self.assertContains(r, 'cannot replace itself')
+        self._assert_extresources_in_table(r, [])
+        self._assert_extresources_form(r, [])
+
         replaced_alias = DocAlias.objects.get(name='draft-ietf-random-thing')
         r = self.supply_extra_metadata(name, status_url, "Submitter Name", "author@example.com", replaces=str(replaced_alias.pk))
         self.assertEqual(r.status_code, 200)
         self.assertContains(r, 'cannot replace an RFC')
+        self._assert_extresources_in_table(r, [])
+        self._assert_extresources_form(r, [])
+
         replaced_alias.document.set_state(State.objects.get(type='draft-iesg',slug='approved'))
         replaced_alias.document.set_state(State.objects.get(type='draft',slug='active'))
         r = self.supply_extra_metadata(name, status_url, "Submitter Name", "author@example.com", replaces=str(replaced_alias.pk))
         self.assertEqual(r.status_code, 200)
         self.assertContains(r, 'approved by the IESG and cannot')
+        self._assert_extresources_in_table(r, [])
+        self._assert_extresources_form(r, [])
+
         r = self.supply_extra_metadata(name, status_url, "Submitter Name", "author@example.com", replaces='')
         self.assertEqual(r.status_code, 302)
         status_url = r["Location"]
         r = self.client.get(status_url)
+        self._assert_extresources_in_table(r, [])
+        self._assert_extresources_form_not_present(r)
+
         self.assertEqual(len(outbox), mailbox_before + 1)
         confirmation_url = self.extract_confirmation_url(outbox[-1])
         self.assertFalse("chairs have been copied" in str(outbox[-1]))
@@ -871,10 +1041,55 @@ class SubmitTests(TestCase):
         draft = Document.objects.get(docalias__name=name)
         self.assertEqual(draft.rev, rev)
         self.assertEqual(draft.relateddocument_set.filter(relationship_id='replaces').count(), replaces_count)
+        self.assertEqual(draft.docextresource_set.count(), 0)
         #
         r = self.client.get(urlreverse('ietf.doc.views_search.recent_drafts'))
         self.assertContains(r, draft.name)
         self.assertContains(r, draft.title)
+        self._assert_extresource_change_event(draft, is_present=False)
+
+    def submit_existing_with_extresources(self, group_type, stream_type='ietf'):
+        """Submit a draft with external resources
+        
+        Unlike some other tests in this module, does not confirm draft if this would be required.
+        """
+        orig_draft = DocumentFactory(
+            type_id='draft',
+            group=GroupFactory(type_id=group_type) if group_type else None,
+            stream_id=stream_type,
+        )  # type: Document
+        name = orig_draft.name
+        group = orig_draft.group
+        new_rev = '%02d' % (int(orig_draft.rev) + 1)
+        author = PersonFactory()  # type: Person
+        DocumentAuthor.objects.create(person=author, document=orig_draft)
+        orig_draft.docextresource_set.create(name_id='faq', value='https://faq.example.com/')
+        orig_draft.docextresource_set.create(name_id='wiki', value='https://wiki.example.com', display_name='Test Wiki')
+        orig_extresources = list(orig_draft.docextresource_set.all())
+
+        status_url, _ = self.do_submission(name=name, rev=new_rev, author=author, group=group)
+
+        # Make sure the submission status inherits the original draft's external resources
+        r = self.client.get(status_url)
+        self.assertEqual(r.status_code, 200)
+        self._assert_extresources_in_table(r, orig_extresources)
+        self._assert_extresources_form(r, orig_extresources)
+
+        # Update with an empty set of resources
+        r = self.supply_extra_metadata(orig_draft.name, status_url, author.name, author.user.email,
+                                       replaces='', extresources=[])
+        self.assertEqual(r.status_code, 302)
+        status_url = r['Location']
+
+        # Should now see the submission's resources and the set currently assigned to the document        
+        r = self.client.get(status_url)
+        self.assertEqual(r.status_code, 200)
+        self._assert_extresources_in_table(r, [])
+        self._assert_extresources_in_table(r, orig_extresources, 'Current document additional resources')
+        self._assert_extresources_form_not_present(r)
+
+    def test_submit_update_individual_with_extresources(self):
+        self.submit_existing_with_extresources(group_type=None, stream_type='ietf')
 
     def submit_new_individual_replacing_wg(self, logged_in=False, group_state_id='active', notify_ad=False):
         """Chair of an active WG should be notified if individual draft is proposed to replace a WG draft"""
@@ -1085,6 +1300,7 @@ class SubmitTests(TestCase):
 
         draft = Document.objects.get(docalias__name=name)
         self.assertEqual(draft.rev, rev)
+        self.assertEqual(draft.docextresource_set.count(), 0)
 
     def test_search_for_submission_and_edit_as_secretariat(self):
         # submit -> edit
@@ -1609,7 +1825,186 @@ class SubmitTests(TestCase):
     def test_submit_wg_ad_approval_auth(self):
         """Area directors should be able to approve submissions in ad-appr state"""
         self.do_wg_approval_auth_test('ad-appr', chair_can_approve=False)
+    def do_approval_with_extresources_test(self, submission, url, action, permitted):
+        """Helper for submission approval external resource testing
+        
+        Only intended to test the permissions handling for external resources. Assumes
+        the permissions defined by can_edit_docextresources() are tested separately.
+        
+        Checks that the submission's external_resources are added / not added based on
+        permitted. Also checks that a suggestion email is not sent / sent.
+        """
+        mailbox_before = len(outbox)
+        with mock.patch('ietf.submit.utils.can_edit_docextresources', return_value=permitted,) as mocked_permission_check:
+            r = self.client.post(url, dict(action=action))
+        self.assertEqual(r.status_code, 302)
+        self.assertTrue(mocked_permission_check.called, 'Permissions were not checked')
 
+        draft = Document.objects.get(name=submission.name)
+        self.assertCountEqual(
+            [str(r) for r in draft.docextresource_set.all()],
+            [str(r) for r in submission.external_resources.all()] if permitted else [],
+        )
+
+        expected_other_emails = 1  # confirmation / approval email
+        if permitted:
+            self._assert_extresource_change_event(draft, is_present=True)
+            self.assertEqual(len(outbox), mailbox_before + expected_other_emails)
+        else:
+            self._assert_extresource_change_event(draft, is_present=False)
+            self.assertEqual(len(outbox), mailbox_before + 1 + expected_other_emails)
+            new_mail = outbox[mailbox_before:]
+            subject = 'External resource change requested for %s' % submission.name
+            suggestion_email = [m for m in new_mail 
+                                if m['Subject'] == subject]
+            self.assertEqual(len(suggestion_email), 1)
+            body = str(suggestion_email[0])
+            for res in submission.external_resources.all():
+                self.assertIn(res.to_form_entry_str(), body)
+
+    def group_approve_with_extresources(self, permitted):
+        group = GroupFactory()
+        # someone to be notified of resource suggestion when permission not granted
+        RoleFactory(group=group, person=PersonFactory(), name_id='chair')
+        submission = SubmissionFactory(state_id='grp-appr', group=group)  # type: Submission
+        SubmissionExtResourceFactory(submission=submission)
+
+        # use secretary user to ensure we have permission to approve
+        self.client.login(username='secretary', password='secretary+password')
+        url = urlreverse('ietf.submit.views.submission_status',
+                         kwargs=dict(submission_id=submission.pk))
+        self.do_approval_with_extresources_test(submission, url, 'approve', permitted)        
+    
+    def test_group_approve_with_extresources(self):
+        """Doc external resources should be updated when approved by group"""
+        self.group_approve_with_extresources(permitted=True)
+        self.group_approve_with_extresources(permitted=False)
+
+    def confirm_with_extresources(self, state, permitted):
+        group = GroupFactory()
+        # someone to be notified of resource suggestion when permission not granted
+        RoleFactory(group=group, person=PersonFactory(), name_id='chair')
+        submission = SubmissionFactory(state_id=state, group=group)  # type: Submission
+        SubmissionExtResourceFactory(submission=submission)
+
+        url = urlreverse(
+            'ietf.submit.views.confirm_submission',
+            kwargs=dict(submission_id=submission.pk,
+                        auth_token=generate_access_token(submission.auth_key))
+        )
+
+        self.do_approval_with_extresources_test(submission, url, 'confirm', permitted)
+
+    def test_confirm_with_extresources(self):
+        """Doc external resources should be updated when confirmed by author"""
+        self.confirm_with_extresources('aut-appr', permitted=True)
+        self.confirm_with_extresources('aut-appr', permitted=False)
+        self.confirm_with_extresources('auth', permitted=True)
+        self.confirm_with_extresources('auth', permitted=False)
+
+    def test_can_edit_docextresources(self):
+        """The can_edit_docextresources method should authorize correctly
+        
+        Tests that is_authorized_in_doc_stream() being True grants access, but does not
+        do detailed testing of that method.
+        """
+        author = PersonFactory()
+        plain = PersonFactory()
+        secretary = Person.objects.get(user__username='secretary')
+        ad = Person.objects.get(user__username='ad')
+        wg_chair = PersonFactory()
+        wg = GroupFactory()
+        RoleFactory(person=wg_chair, group=wg, name_id='chair')
+
+        wg_doc = WgDraftFactory(authors=[author], group=wg)
+        self.assertFalse(can_edit_docextresources(author.user, wg_doc))
+        self.assertTrue(can_edit_docextresources(secretary.user, wg_doc))
+        self.assertTrue(can_edit_docextresources(ad.user, wg_doc))
+        self.assertTrue(can_edit_docextresources(wg_chair.user, wg_doc))
+        self.assertFalse(can_edit_docextresources(plain.user, wg_doc))
+        with mock.patch('ietf.doc.utils.is_authorized_in_doc_stream', return_value=True):
+            self.assertTrue(can_edit_docextresources(plain.user, wg_doc))
+
+        individ_doc = IndividualDraftFactory(authors=[author])
+        self.assertTrue(can_edit_docextresources(author.user, individ_doc))
+        self.assertTrue(can_edit_docextresources(secretary.user, individ_doc))
+        self.assertTrue(can_edit_docextresources(ad.user, individ_doc))
+        self.assertFalse(can_edit_docextresources(wg_chair.user, individ_doc))
+        self.assertFalse(can_edit_docextresources(plain.user, individ_doc))
+        with mock.patch('ietf.doc.utils.is_authorized_in_doc_stream', return_value=True):
+            self.assertTrue(can_edit_docextresources(plain.user, individ_doc))
+
+    def test_forcepost_with_extresources(self):
+        # state needs to be one that has 'posted' as a next state
+        submission = SubmissionFactory(state_id='grp-appr')  # type: Submission
+        SubmissionExtResourceFactory(submission=submission)
+
+        url = urlreverse(
+            'ietf.submit.views.submission_status',
+            kwargs=dict(submission_id=submission.pk),
+        )
+
+        self.client.login(username='secretary', password='secretary+password')
+        r = self.client.post(url, dict(action='forcepost'))
+        self.assertEqual(r.status_code, 302)
+        draft = Document.objects.get(name=submission.name)
+        self._assert_extresource_change_event(draft, is_present=True)
+        self.assertCountEqual(
+            [str(r) for r in draft.docextresource_set.all()],
+            [str(r) for r in submission.external_resources.all()],
+        )
+
+    def test_submission_status_labels_extresource_changes(self):
+        """Added or removed labels should be present for changed external resources"""
+        draft = WgDraftFactory(rev='00')
+        draft.docextresource_set.create(
+            name_id='faq',
+            value='https://example.com/faq-removed',
+            display_name='Resource to be removed',
+        )
+        draft.docextresource_set.create(
+            name_id='faq',
+            value='https://example.com/faq-kept',
+            display_name='Resource to be kept',
+        )
+        
+        submission = SubmissionFactory(name=draft.name, rev='01')
+        submission.external_resources.create(
+            name_id='faq',
+            value='https://example.com/faq-kept',
+            display_name='Resource to be kept',
+        )
+        submission.external_resources.create(
+            name_id='faq',
+            value='https://example.com/faq-added',
+            display_name='Resource to be added',
+        )
+        
+        url = urlreverse('ietf.submit.views.submission_status',
+                         kwargs=dict(submission_id=submission.pk))
+        r = self.client.get(url)
+        self.assertEqual(r.status_code, 200)
+        
+        q = PyQuery(r.content)
+        
+        # The removed resource should appear once (for the doc current value), tagged as removed
+        removed_div = q('td>div:contains("Resource to be removed")')
+        self.assertEqual(len(removed_div), 1)
+        self.assertEqual(len(removed_div('span.label:contains("Removed")')), 1)
+        self.assertEqual(len(removed_div('span.label:contains("New")')), 0)
+
+        # The added resource should appear once (for the submission), tagged as new
+        added_div = q('td>div:contains("Resource to be added")')
+        self.assertEqual(len(added_div), 1)
+        self.assertEqual(len(added_div('span.label:contains("Removed")')), 0)
+        self.assertEqual(len(added_div('span.label:contains("New")')), 1)
+
+        # The kept resource should appear twice (once for the doc, once for the submission), with no tag
+        kept_div = q('td>div:contains("Resource to be kept")')
+        self.assertEqual(len(kept_div), 2)
+        self.assertEqual(len(kept_div('span.label:contains("Removed")')), 0)
+        self.assertEqual(len(kept_div('span.label:contains("New")')), 0)
+        
 class ApprovalsTestCase(TestCase):
     def test_approvals(self):
         RoleFactory(name_id='chair',
@@ -2380,6 +2775,33 @@ class ApiSubmitTests(TestCase):
         expected = "Document date must be within 3 days of submission date"
         self.assertContains(r, expected, status_code=400)
 
+    def test_api_submit_keeps_extresources(self):
+        """API submit should not disturb doc external resources
+        
+        Tests that the submission inherits the existing doc's docextresource_set.
+        Relies on separate testing that Submission external_resources will be
+        handled appropriately.
+        """
+        draft = WgDraftFactory()
+
+        # add an external resource
+        self.assertEqual(draft.docextresource_set.count(), 0)
+        extres = draft.docextresource_set.create(
+            name_id='faq',
+            display_name='this is a display name',
+            value='https://example.com/faq-for-test.html',
+        )
+        
+        r, _, __ = self.do_post_submission('01', name=draft.name)
+        self.assertEqual(r.status_code, 200)
+        # draft = Document.objects.get(pk=draft.pk)  # update the draft
+        sub = Submission.objects.get(name=draft.name)
+        self.assertEqual(
+            [str(r) for r in sub.external_resources.all()],
+            [str(extres)],
+        )
+
+        
 class RefsTests(TestCase):
 
     def test_draft_refs_identification(self):
diff --git a/ietf/submit/utils.py b/ietf/submit/utils.py
index 2c04fc230..27a14420f 100644
--- a/ietf/submit/utils.py
+++ b/ietf/submit/utils.py
@@ -23,18 +23,19 @@ import debug                            # pyflakes:ignore
 from ietf.doc.models import ( Document, State, DocAlias, DocEvent, SubmissionDocEvent,
     DocumentAuthor, AddedMessageEvent )
 from ietf.doc.models import NewRevisionDocEvent
-from ietf.doc.models import RelatedDocument, DocRelationshipName
+from ietf.doc.models import RelatedDocument, DocRelationshipName, DocExtResource
 from ietf.doc.utils import add_state_change_event, rebuild_reference_relations
-from ietf.doc.utils import set_replaces_for_document, prettify_std_name
-from ietf.doc.mails import send_review_possibly_replaces_request
+from ietf.doc.utils import set_replaces_for_document, prettify_std_name, update_doc_extresources, can_edit_docextresources
+from ietf.doc.mails import send_review_possibly_replaces_request, send_external_resource_change_request
 from ietf.group.models import Group
 from ietf.ietfauth.utils import has_role
 from ietf.name.models import StreamName, FormalLanguageName
 from ietf.person.models import Person, Email
 from ietf.community.utils import update_name_contains_indexes_with_new_doc
 from ietf.submit.mail import ( announce_to_lists, announce_new_version, announce_to_authors,
-    announce_new_wg_00, send_approval_request, send_submission_confirmation )
-from ietf.submit.models import Submission, SubmissionEvent, Preapproval, DraftSubmissionStateName, SubmissionCheck
+    send_approval_request, send_submission_confirmation, announce_new_wg_00 )
+from ietf.submit.models import ( Submission, SubmissionEvent, Preapproval, DraftSubmissionStateName,
+    SubmissionCheck, SubmissionExtResource )
 from ietf.utils import log
 from ietf.utils.accesstoken import generate_random_key
 from ietf.utils.draft import Draft
@@ -408,10 +409,24 @@ def post_submission(request, submission, approved_doc_desc, approved_subm_desc):
     log.log(f"{submission.name}: moved files")
 
     new_replaces, new_possibly_replaces = update_replaces_from_submission(request, submission, draft)
-
     update_name_contains_indexes_with_new_doc(draft)
     log.log(f"{submission.name}: updated replaces and indexes")
 
+    # See whether a change to external resources is requested. Test for equality of sets is ugly,
+    # but works.
+    draft_resources = '\n'.join(sorted(str(r) for r in draft.docextresource_set.all()))
+    submission_resources = '\n'.join(sorted(str(r) for r in submission.external_resources.all()))
+    if draft_resources != submission_resources:
+        if can_edit_docextresources(request.user, draft):
+            update_docextresources_from_submission(request, submission, draft)
+            log.log(f"{submission.name}: updated external resources")
+        else:
+            send_external_resource_change_request(request,
+                                                  draft,
+                                                  submitter_info,
+                                                  submission.external_resources.all())
+            log.log(f"{submission.name}: sent email suggesting external resources")
+
     announce_to_lists(request, submission)
     if submission.group and submission.group.type_id == 'wg' and draft.rev == '00':
         announce_new_wg_00(request, submission)
@@ -482,6 +497,12 @@ def update_replaces_from_submission(request, submission, draft):
 
     return approved, suggested
 
+def update_docextresources_from_submission(request, submission, draft):
+    doc_resources = [DocExtResource.from_sibling_class(res)
+                     for res in submission.external_resources.all()]
+    by = request.user.person if request.user.is_authenticated else Person.objects.get(name='(System)')
+    update_doc_extresources(draft, doc_resources, by)
+
 def get_person_from_name_email(name, email):
     # try email
     if email and (email.startswith('unknown-email-') or is_valid_email(email)):
@@ -781,6 +802,7 @@ def fill_in_submission(form, submission, authors, abstract, file_size):
     submission.save()
 
     submission.formal_languages.set(FormalLanguageName.objects.filter(slug__in=form.parsed_draft.get_formal_languages()))
+    set_extresources_from_existing_draft(submission)
 
 def apply_checkers(submission, file_name):
     # run submission checkers
@@ -814,7 +836,7 @@ def accept_submission_requires_prev_auth_approval(submission):
 
 def accept_submission_requires_group_approval(submission):
     """Does acceptance process require group approval?
-    
+
     Depending on the state of the group, this approval may come from group chair or area director.
     """
     return (
@@ -825,7 +847,7 @@ def accept_submission_requires_group_approval(submission):
 
 def accept_submission(request, submission, autopost=False):
     """Accept a submission and post or put in correct state to await approvals
-    
+
     If autopost is True, will post draft if submitter is authorized to do so.
     """
     doc = submission.existing_document()
@@ -940,5 +962,24 @@ def accept_submission(request, submission, autopost=False):
         create_submission_event(request, submission, sub_event_desc)
     if docevent_desc:
         docevent_from_submission(request, submission, docevent_desc, who=Person.objects.get(name="(System)"))
-        
-    return address_list
\ No newline at end of file
+
+    return address_list
+
+def set_extresources_from_existing_draft(submission):
+    """Replace a submission's external resources with values from previous revision
+
+    If there is no previous revision, clears the external resource list for the submission.
+    """
+    doc = submission.existing_document()
+    if doc:
+        update_submission_external_resources(
+            submission,
+            [SubmissionExtResource.from_sibling_class(res)
+             for res in doc.docextresource_set.all()]
+        )
+
+def update_submission_external_resources(submission, new_resources):
+    submission.external_resources.all().delete()
+    for new_res in new_resources:
+        new_res.submission = submission
+        new_res.save()
diff --git a/ietf/submit/views.py b/ietf/submit/views.py
index c939603f2..4a61a4eeb 100644
--- a/ietf/submit/views.py
+++ b/ietf/submit/views.py
@@ -6,7 +6,7 @@ import re
 import base64
 import datetime
 
-from typing import Optional         # pyflakes:ignore
+from typing import Optional, cast         # pyflakes:ignore
 
 from django.conf import settings
 from django.contrib import messages
@@ -22,6 +22,7 @@ from django.views.decorators.csrf import csrf_exempt
 import debug                            # pyflakes:ignore
 
 from ietf.doc.models import Document, DocAlias, AddedMessageEvent
+from ietf.doc.forms import ExtResourceForm
 from ietf.group.models import Group
 from ietf.group.utils import group_features_group_filter
 from ietf.ietfauth.utils import has_role, role_required
@@ -31,14 +32,14 @@ from ietf.person.models import Email
 from ietf.submit.forms import ( SubmissionManualUploadForm, SubmissionAutoUploadForm, AuthorForm,
     SubmitterForm, EditSubmissionForm, PreapprovalForm, ReplacesForm, SubmissionEmailForm, MessageModelForm )
 from ietf.submit.mail import send_full_url, send_manual_post_request, add_submission_email, get_reply_to
-from ietf.submit.models import (Submission, Preapproval,
+from ietf.submit.models import (Submission, Preapproval, SubmissionExtResource,
     DraftSubmissionStateName, SubmissionEmailEvent )
 from ietf.submit.utils import ( approvable_submissions_for_user, preapprovals_for_user,
     recently_approved_by_user, validate_submission, create_submission_event, docevent_from_submission,
     post_submission, cancel_submission, rename_submission_files, remove_submission_files, get_draft_meta,
     get_submission, fill_in_submission, apply_checkers, save_files, 
     check_submission_revision_consistency, accept_submission, accept_submission_requires_group_approval,
-    accept_submission_requires_prev_auth_approval)
+    accept_submission_requires_prev_auth_approval, update_submission_external_resources )
 from ietf.stats.utils import clean_country_name
 from ietf.utils.accesstoken import generate_access_token
 from ietf.utils.log import log
@@ -267,6 +268,7 @@ def submission_status(request, submission_id, access_token=None):
     confirmation_list = [ "%s <%s>" % parseaddr(a) for a in addresses ]
 
     message = None
+
     if submission.state_id == "cancel":
         message = ('error', 'This submission has been cancelled, modification is no longer possible.')
     elif submission.state_id == "auth":
@@ -278,8 +280,58 @@ def submission_status(request, submission_id, access_token=None):
     elif submission.state_id == "aut-appr":
         message = ('success', 'The submission is pending approval by the authors of the previous version. An email has been sent to: %s' % ", ".join(confirmation_list))
 
+    existing_doc = submission.existing_document()
+
+    # Sort out external resources
+    external_resources = [
+        dict(res=r, added=False)
+        for r in submission.external_resources.order_by('name__slug', 'value', 'display_name')
+    ]
+
+    # Show comparison of resources with current doc resources. If not posted or canceled,
+    # determine which resources were added / removed. In the output, submission resources
+    # will be marked as "new" if they were not present on the existing document. Document
+    # resources will be marked as "removed" if they are not present in the submission.
+    #
+    # To classify the resources, start by assuming that every submission resource already
+    # existed (the "added=False" above) and that every existing document resource was
+    # removed (the "removed=True" below). Then check every submission resource for a
+    # matching resource on the existing document that is still marked as "removed". If one
+    # exists, change the existing resource to "not removed" and leave the submission resource
+    # as "not added." If there is no matching removed resource, then mark the submission
+    # resource as "added."
+    #
+    show_resource_changes = submission.state_id not in ['posted', 'cancel']
+    doc_external_resources = [dict(res=r, removed=True)
+                              for r in existing_doc.docextresource_set.all()] if existing_doc else []
+    if show_resource_changes:
+        for item in external_resources:
+            er = cast(SubmissionExtResource, item['res'])  # cast to help type checker with the dict typing
+            # get first matching resource still marked as 'removed' from previous rev resources
+            existing_item = next(
+                filter(
+                    lambda r: (r['removed']
+                               and er.name == r['res'].name
+                               and er.value == r['res'].value
+                               and er.display_name == r['res'].display_name),
+                    doc_external_resources
+                ),
+                None
+            )  # type: ignore
+            if existing_item is None:
+                item['added'] = True
+            else:
+                existing_item['removed'] = False
+        doc_external_resources.sort(
+            key=lambda d: (d['res'].name.slug, d['res'].value, d['res'].display_name)
+        )
+
     submitter_form = SubmitterForm(initial=submission.submitter_parsed(), prefix="submitter")
     replaces_form = ReplacesForm(name=submission.name,initial=DocAlias.objects.filter(name__in=submission.replaces.split(",")))
+    extresources_form = ExtResourceForm(
+        initial=dict(resources=[er['res'] for er in external_resources]),
+        extresource_model=SubmissionExtResource,
+    )
 
     if request.method == 'POST':
         action = request.POST.get('action')
@@ -289,13 +341,23 @@ def submission_status(request, submission_id, access_token=None):
 
             submitter_form = SubmitterForm(request.POST, prefix="submitter")
             replaces_form = ReplacesForm(request.POST, name=submission.name)
-            validations = [submitter_form.is_valid(), replaces_form.is_valid()]
+            extresources_form = ExtResourceForm(
+                request.POST, extresource_model=SubmissionExtResource
+            )
+            validations = [
+                submitter_form.is_valid(),
+                replaces_form.is_valid(),
+                extresources_form.is_valid(),
+            ]
 
             if all(validations):
                 submission.submitter = submitter_form.cleaned_line()
                 replaces = replaces_form.cleaned_data.get("replaces", [])
                 submission.replaces = ",".join(o.name for o in replaces)
 
+                extresources = extresources_form.cleaned_data.get('resources', [])
+                update_submission_external_resources(submission, extresources)
+
                 approvals_received = submitter_form.cleaned_data['approvals_received']
                 
                 if submission.rev == '00' and submission.group and not submission.group.is_active:
@@ -388,6 +450,12 @@ def submission_status(request, submission_id, access_token=None):
         'passes_checks': passes_checks,
         'submitter_form': submitter_form,
         'replaces_form': replaces_form,
+        'extresources_form': extresources_form,
+        'external_resources': {
+            'current': external_resources, # dict with 'res' and 'added' as keys
+            'previous': doc_external_resources, # dict with 'res' and 'removed' as keys
+            'show_changes': show_resource_changes,
+        },
         'message': message,
         'can_edit': can_edit,
         'can_force_post': can_force_post,
diff --git a/ietf/templates/doc/mail/external_resource_change_request.txt b/ietf/templates/doc/mail/external_resource_change_request.txt
new file mode 100644
index 000000000..5d0a12c35
--- /dev/null
+++ b/ietf/templates/doc/mail/external_resource_change_request.txt
@@ -0,0 +1,18 @@
+{% autoescape off %}{% with current_resources=doc.docextresource_set.all %}
+{{ submitter_info }} has requested changes to the additional resources for 
+{{ doc }}:
+
+{% if current_resources %}Currently, the additional resources for this document are:
+{% for res in current_resources %}
+{{ res.to_form_entry_str }}{% endfor %}{% else %}Currently, this document has no additional resources.{% endif %}
+
+{% if requested_resources %}It is requested that the additional resources be changed to:
+{% for res in requested_resources %}
+{{ res.to_form_entry_str }}{% endfor %}{% else %}It is requested that the additional resources be removed.{% endif %}
+
+If this is an acceptable change, please visit
+
+  {{ doc_url }}
+
+and edit the additional resources accordingly.
+{% endwith %}{% endautoescape %}
diff --git a/ietf/templates/submit/extresources_form.html b/ietf/templates/submit/extresources_form.html
new file mode 100644
index 000000000..beaf3e668
--- /dev/null
+++ b/ietf/templates/submit/extresources_form.html
@@ -0,0 +1,4 @@
+{% load bootstrap3 %}
+<h3>Additional resource information</h3>
+{% bootstrap_form extresources_form %}
+<p><b>Valid tags:</b> {{ extresources_form.valid_resource_tags|join:", " }}</p>
diff --git a/ietf/templates/submit/submission_status.html b/ietf/templates/submit/submission_status.html
index 2037244a5..66dbf352c 100644
--- a/ietf/templates/submit/submission_status.html
+++ b/ietf/templates/submit/submission_status.html
@@ -31,7 +31,7 @@
     </p>
   {% endif %}
 
-  {% if submitter_form.errors or replaces_form.errors %}
+  {% if submitter_form.errors or replaces_form.errors or extresources_form.errors %}
     <p class="alert alert-danger">Please fix errors in the form below.</p>
   {% endif %}
 
@@ -269,6 +269,42 @@
         {% if errors.formal_languages %}<p class="text-danger bg-danger"><b>{{ errors.formal_languages }}</b></p>{% endif %}
       </td>
     </tr>
+  
+  <tr>
+      <th>Submission additional resources</th>
+      <td>
+          {% for r in external_resources.current %}{% with res=r.res added=r.added %}
+          <div>
+              {{ res.name.name }}: {{ res.value }}
+              {% if res.display_name %} (as &quot;{{ res.display_name }}&quot;) {% endif %}
+              {% if external_resources.show_changes and added %}
+                  <span class="label label-success">New</span>
+              {% endif %}
+          </div>
+          {% endwith %}
+          {% empty %}
+              None 
+          {% endfor %}
+      </td>
+  </tr>
+
+  {% if external_resources.show_changes %}<tr>
+      <th>Current document additional resources</th>
+      <td>
+          {% for r in external_resources.previous %}{% with res=r.res removed=r.removed %}
+          <div>
+              {{ res.name.name }}: {{ res.value }}
+              {% if res.display_name %} (as &quot;{{ res.display_name }}&quot;) {% endif %}
+              {% if removed %}
+                  <span class="label label-warning">Removed</span>
+              {% endif %}
+          </div>
+          {% endwith %}
+          {% empty %}
+              None
+          {% endfor %}
+      </td>
+  </tr>{% endif %}
   </table>
 
   {% if can_edit %}
@@ -287,6 +323,7 @@
         {% csrf_token %}
         {% include "submit/submitter_form.html" %}
         {% include "submit/replaces_form.html" %}
+        {% include "submit/extresources_form.html" %}
         <input type="hidden" name="action" value="autopost">
 	<h3>Post submission</h3>
         <button class="btn btn-primary" type="submit">Post submission</button>