diff --git a/ontology/uco-gufo.ttl b/ontology/uco-gufo.ttl
index af74787..dfff42e 100644
--- a/ontology/uco-gufo.ttl
+++ b/ontology/uco-gufo.ttl
@@ -180,6 +180,13 @@ uco-core:Item
 		;
 	.
 
+uco-core:Relationship
+	rdfs:subClassOf
+		drafting:Endurant ,
+		gufo:Object
+		;
+	.
+
 uco-core:endTime
 	rdfs:seeAlso
 		gufo:hasEndPoint ,
@@ -272,3 +279,37 @@ uco-types:Hash
 	owl:annotatedSubject uco-core:Assertion ;
 	.
 
+[]
+	a owl:NegativePropertyAssertion ;
+	rdfs:comment "If this specialization were introduced, a further specialization would be suggested for gufo:mediates.  A demonstration exists among the CASE examples that is incompatible: A Relationship, 'Mapped_Into', that relates two Actions together to demonstrate a lifecycle phase."@en ;
+	rdfs:seeAlso
+		<http://example.org/kb/lifecycle_phase-60a55e96-d39e-487e-9b39-3ba96e1ffc7a> ,
+		<https://github.com/casework/CASE-Examples/tree/dc6f6b901289c1684fd88e25e9bcec925974d155/examples/illustrations/forensic_lifecycle> ,
+		[
+			a owl:NegativePropertyAssertion ;
+			rdfs:comment "gufo:mediates has range gufo:Endurant, but a uco-core:Relationship is permitted to link any UcoObject, including perdurants."@en ;
+			rdfs:seeAlso
+				<http://example.org/kb/lifecycle_phase-60a55e96-d39e-487e-9b39-3ba96e1ffc7a> ,
+				<https://github.com/casework/CASE-Examples/tree/dc6f6b901289c1684fd88e25e9bcec925974d155/examples/illustrations/forensic_lifecycle>
+				;
+			owl:assertionProperty rdfs:subPropertyOf ;
+			owl:sourceInvididual uco-core:source ;
+			owl:targetInvididual gufo:mediates ;
+		] ,
+		[
+			a owl:NegativePropertyAssertion ;
+			rdfs:comment "gufo:mediates has range gufo:Endurant, but a uco-core:Relationship is permitted to link any UcoObject, including perdurants."@en ;
+			rdfs:seeAlso
+				<http://example.org/kb/lifecycle_phase-60a55e96-d39e-487e-9b39-3ba96e1ffc7a> ,
+				<https://github.com/casework/CASE-Examples/tree/dc6f6b901289c1684fd88e25e9bcec925974d155/examples/illustrations/forensic_lifecycle>
+				;
+			owl:assertionProperty rdfs:subPropertyOf ;
+			owl:sourceInvididual uco-core:target ;
+			owl:targetInvididual gufo:mediates ;
+		]
+		;
+	owl:assertionProperty rdfs:subClassOf ;
+	owl:sourceInvididual uco-core:Relationship ;
+	owl:targetInvididual gufo:Relator ;
+	.
+
diff --git a/tests/exemplars.ttl b/tests/exemplars.ttl
index e32d28a..f6b95c7 100644
--- a/tests/exemplars.ttl
+++ b/tests/exemplars.ttl
@@ -60,11 +60,19 @@ kb:BluetoothAddressFacet-717b8cce-e9c2-4d59-81e4-1747d7e2d8ee
 	a uco-observable:BluetoothAddressFacet ;
 	.
 
+kb:ContentData-0571dfb7-889e-4e8c-bec7-47a62ab9286f
+	a uco-observable:ContentData ;
+	.
+
 kb:ContentData-179c7e84-f72d-47f7-b6f3-3f4a1f0938bd
 	a uco-observable:ContentData ;
 	uco-core:hasFacet kb:ContentDataFacet-a961d865-087b-43bd-ab31-0e33331c5628 ;
 	.
 
+kb:ContentData-3f13e43a-a3f4-4dcc-8db2-e934b24890ec
+	a uco-observable:ContentData ;
+	.
+
 kb:ContentDataFacet-a961d865-087b-43bd-ab31-0e33331c5628
 	a uco-observable:ContentDataFacet ;
 	.
@@ -140,6 +148,14 @@ kb:QualityValueAttributionSituation-872b7dd1-b49a-4278-bfdf-df507493d63f
 	gufo:hasEndPoint kb:Instant-c9ae3fce-ddcb-416b-971b-559c2f5bee95 ;
 	.
 
+kb:Relationship-2be6b54a-a051-499c-9dcd-63d17d813293
+	a uco-core:Relationship ;
+	uco-core:isDirectional "true"^^xsd:boolean ;
+	uco-core:kindOfRelationship "Contained_Within" ;
+	uco-core:source kb:ContentData-0571dfb7-889e-4e8c-bec7-47a62ab9286f ;
+	uco-core:target kb:ContentData-3f13e43a-a3f4-4dcc-8db2-e934b24890ec ;
+	.
+
 kb:Vehicle-c7e910e8-4bed-473e-ad74-3df3eb63cbcc
 	a drafting:Vehicle ;
 	gufo:standsInQualifiedAttribution