diff --git a/cromulent/model.py b/cromulent/model.py
index 12997d8..e2363c1 100644
--- a/cromulent/model.py
+++ b/cromulent/model.py
@@ -371,10 +371,19 @@ class ExternalResource(object):
 	_type = ""
 	_embed = True
 
+
+	def _is_uri(self, what):
+		uri_schemes = ['urn:uuid:', 'tag:', 'data:', 'mailto:', 'info:', 'ftp:/', 'sftp:/'] 
+		for u in uri_schemes:
+			if what.startswith(u):
+				return True
+		return False
+
+
 	def __init__(self, ident=None):
 		self._factory = factory
 		if ident is not None:
-			if ident.startswith('urn:uuid'):
+			if self._is_uri(ident):
 				self.id = ident
 			elif ident.startswith('http'):
 				# Try to find prefixable term
@@ -395,7 +404,7 @@ class ExternalResource(object):
 				# Allow explicit setting of empty string
 				self.id = ""
 			else:
-				# Allow for prefixed term
+				# Allow for prefixed term that isn't ambiguously a URI
 				curied = ident.split(':', 1)
 				if len(curied) == 2 and curied[0] in self._factory.prefixes:
 					self.id = ident

Support tag: URIs for internal identity management

Rather than assigning UUIDs or other final URIs to instances, crom should support tag: URIs that are temporary carriers of the identity conditions, to then be substituted on the way into a more permanent infrastructure.  These would need to be assigned (they can't be auto-generated) and would be similar to the urn:uuid: pattern otherwise.

(/ht @kasei)
diff --git a/tests/test_model.py b/tests/test_model.py
index 281d0f8..e85827c 100644
--- a/tests/test_model.py
+++ b/tests/test_model.py
@@ -269,6 +269,14 @@ class TestAutoIdentifiers(unittest.TestCase):
 		p4 = model.Person('fish:4')
 		self.assertTrue(p4.id.startswith(model.factory.base_url))
 
+	def test_other_uris(self):
+		p1 = model.Person(ident="tag:some-info-about-person")
+		self.assertEqual(p1.id, "tag:some-info-about-person")
+		p2 = model.Person(ident="info:ulan/500012345")
+		self.assertEqual(p2.id, "info:ulan/500012345")
+		p3 = model.Person(ident="some:random:thing:with:colons")
+		self.assertFalse(p3.id == "some:random:thing:with:colons")
+
 	def test_no_ident(self):
 
 		model.factory.auto_assign_id = True

pip install -e .
parse_log_pytest
requirements.txt
pytest pytest-cov pytest-xdist
apt-get update apt-get install -y gcc
3.6
requirements.txt
pytest --no-header -rA --tb=line --color=no -p no:cacheprovider -W ignore::DeprecationWarning
attrs==22.2.0
certifi==2021.5.30
coverage==6.2
-e git+https://github.com/thegetty/crom.git@44cbb8103b7c6372c111dd7969e6049ffaa05ad0#egg=cromulent
execnet==1.9.0
importlib-metadata==4.8.3
iniconfig==1.1.1
ordereddict==1.1
packaging==21.3
pluggy==1.0.0
py==1.11.0
pyparsing==3.1.4
pytest==7.0.1
pytest-cov==4.0.0
pytest-xdist==3.0.2
tomli==1.2.3
typing_extensions==4.1.1
zipp==3.6.0

name: crom
channels:
  - defaults
  - https://repo.anaconda.com/pkgs/main
  - https://repo.anaconda.com/pkgs/r
  - conda-forge
dependencies:
  - _libgcc_mutex=0.1=main
  - _openmp_mutex=5.1=1_gnu
  - ca-certificates=2025.2.25=h06a4308_0
  - certifi=2021.5.30=py36h06a4308_0
  - ld_impl_linux-64=2.40=h12ee557_0
  - libffi=3.3=he6710b0_2
  - libgcc-ng=11.2.0=h1234567_1
  - libgomp=11.2.0=h1234567_1
  - libstdcxx-ng=11.2.0=h1234567_1
  - ncurses=6.4=h6a678d5_0
  - openssl=1.1.1w=h7f8727e_0
  - pip=21.2.2=py36h06a4308_0
  - python=3.6.13=h12debd9_1
  - readline=8.2=h5eee18b_0
  - setuptools=58.0.4=py36h06a4308_0
  - sqlite=3.45.3=h5eee18b_0
  - tk=8.6.14=h39e8969_0
  - wheel=0.37.1=pyhd3eb1b0_0
  - xz=5.6.4=h5eee18b_1
  - zlib=1.2.13=h5eee18b_1
  - pip:
      - attrs==22.2.0
      - coverage==6.2
      - execnet==1.9.0
      - importlib-metadata==4.8.3
      - iniconfig==1.1.1
      - ordereddict==1.1
      - packaging==21.3
      - pluggy==1.0.0
      - py==1.11.0
      - pyparsing==3.1.4
      - pytest==7.0.1
      - pytest-cov==4.0.0
      - pytest-xdist==3.0.2
      - tomli==1.2.3
      - typing-extensions==4.1.1
      - zipp==3.6.0
prefix: /opt/conda/envs/crom

tests/test_model.py::TestAutoIdentifiers::test_other_uris
tests/test_model.py::TestFactorySerialization::test_toFile tests/test_model.py::TestBaseResource::test_check_reference
tests/test_model.py::TestFactorySetup::test_base_dir tests/test_model.py::TestFactorySetup::test_base_url tests/test_model.py::TestFactorySetup::test_default_lang tests/test_model.py::TestFactorySetup::test_load_context tests/test_model.py::TestFactorySetup::test_pickle tests/test_model.py::TestFactorySetup::test_set_debug tests/test_model.py::TestFactorySetup::test_set_debug_stream tests/test_model.py::TestFactorySerialization::test_breadth tests/test_model.py::TestFactorySerialization::test_broken_unicode tests/test_model.py::TestFactorySerialization::test_collapse_json tests/test_model.py::TestFactorySerialization::test_external tests/test_model.py::TestFactorySerialization::test_pipe_scoped tests/test_model.py::TestFactorySerialization::test_recursion tests/test_model.py::TestFactorySerialization::test_string_list tests/test_model.py::TestFactorySerialization::test_toJSON tests/test_model.py::TestFactorySerialization::test_toJSON_full tests/test_model.py::TestFactorySerialization::test_toString tests/test_model.py::TestProcessTSV::test_process_tsv tests/test_model.py::TestBuildClasses::test_build_classes tests/test_model.py::TestBuildClass::test_build_class tests/test_model.py::TestAutoIdentifiers::test_bad_autoid tests/test_model.py::TestAutoIdentifiers::test_int tests/test_model.py::TestAutoIdentifiers::test_int_per_segment tests/test_model.py::TestAutoIdentifiers::test_int_per_type tests/test_model.py::TestAutoIdentifiers::test_no_ident tests/test_model.py::TestAutoIdentifiers::test_prefixes tests/test_model.py::TestAutoIdentifiers::test_uuid tests/test_model.py::TestBaseResource::test_allows_multiple tests/test_model.py::TestBaseResource::test_check_prop tests/test_model.py::TestBaseResource::test_dir tests/test_model.py::TestBaseResource::test_init tests/test_model.py::TestBaseResource::test_init_params tests/test_model.py::TestBaseResource::test_list_all_props tests/test_model.py::TestBaseResource::test_list_my_props tests/test_model.py::TestBaseResource::test_multiplicity tests/test_model.py::TestPropertyCache::test_cache_hierarchy tests/test_model.py::TestMagicMethods::test_set_magic_resource tests/test_model.py::TestMagicMethods::test_set_magic_resource_inverse tests/test_model.py::TestMagicMethods::test_validate_multiplicity tests/test_model.py::TestMagicMethods::test_validate_profile_off tests/test_model.py::TestMagicMethods::test_validation_off tests/test_model.py::TestMagicMethods::test_validation_unknown tests/test_model.py::TestMagicMethods::test_validation_wrong_type
cromulent/model.py
cromulent/model.py