diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a2b4da1..730b081 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -24,14 +24,14 @@ jobs:
 
       - name: Install Dependencies
         run: |
-          pip -q install poetry pre-commit
+          pip -q install poetry pre-commit rdflib
           poetry install
 
       - name: Pre-commit Checks
         run: pre-commit run --all-files
 
       - name: Unit Tests
-        run: poetry run pytest
+        run: poetry run pytest --doctest-modules
 
       - name: Run Example
         run: poetry run python example.py > case.jsonld
@@ -44,6 +44,11 @@ jobs:
           case-version: "case-1.3.0"
           extension-filter: "jsonld"
 
+      - name: Convert example
+        run: |
+          rdfpipe --output-format turtle case.jsonld > case.ttl
+          test 0 -eq $(grep 'file:' case.ttl | wc -l) || (echo "ERROR:ci.yml:Some graph IRIs do not supply a resolving prefix.  Look for the string 'file:///' in the file case.ttl (created by running 'make check') to see these instances." >&2 ; exit 1)
+
       # Always build the package as a sanity check to ensure no issues with the build system
       # exist as part of the CI process
       - name: Build Package
diff --git a/.gitignore b/.gitignore
index ad89e2d..2d7de5f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -19,3 +19,4 @@ __pycache__/
 # Build Artifacts
 build/
 dist/
+case.ttl
diff --git a/Makefile b/Makefile
index 8abb4e9..5b2e0b2 100644
--- a/Makefile
+++ b/Makefile
@@ -81,7 +81,26 @@ case.jsonld: \
 	    _$@
 	mv _$@ $@
 
+case.ttl: \
+  case.jsonld
+	source venv/bin/activate \
+	  && rdfpipe \
+	    --output-format turtle \
+	    $< \
+	    > _$@
+	source venv/bin/activate \
+	  && case_validate \
+	    _$@
+	@# In instances where graph nodes omit use of a prefix, a 'default' prefix-base is used that incorporates the local directory as a file URL.  This is likely to be an undesired behavior, so for the generated example JSON-LD in the top source directory, check that "file:///" doesn't start any of the graph individuals' IRIs.
+	test \
+	  0 \
+	  -eq \
+	  $$(grep 'file:' _$@ | wc -l) \
+	  || ( echo "ERROR:Makefile:Some graph IRIs do not supply a resolving prefix.  Look for the string 'file:///' in the file _$@ to see these instances." >&2 ; exit 1)
+	mv _$@ $@
+
 check: \
-  all
+  all \
+  case.ttl
 	source venv/bin/activate \
-	  && poetry run pytest
+	  && poetry run pytest --doctest-modules
diff --git a/case.jsonld b/case.jsonld
index f87e17a..2e0aafe 100644
--- a/case.jsonld
+++ b/case.jsonld
@@ -1,5 +1,5 @@
 {
-    "@id": "aef8e4c4-db83-59fd-8f71-b65cd7676c0a",
+    "@id": "kb:aef8e4c4-db83-59fd-8f71-b65cd7676c0a",
     "@context": {
         "@vocab": "http://caseontology.org/core#",
         "case-investigation": "https://ontology.caseontology.org/case/investigation/",
@@ -15,36 +15,37 @@
         "uco-tool": "https://ontology.unifiedcyberontology.org/uco/tool/",
         "uco-types": "https://ontology.unifiedcyberontology.org/uco/types/",
         "uco-vocabulary": "https://ontology.unifiedcyberontology.org/uco/vocabulary/",
-        "xsd": "http://www.w3.org/2001/XMLSchema#"
+        "xsd": "http://www.w3.org/2001/XMLSchema#",
+        "kb": "http://example.org/kb/"
     },
     "@type": "uco-core:Bundle",
     "uco-core:description": "An Example Case File",
     "uco-core:object": [
         {
-            "@id": "307df50e-0116-5c51-904c-d5aa69279018",
+            "@id": "kb:307df50e-0116-5c51-904c-d5aa69279018",
             "@type": "uco-identity:Organization",
             "uco-core:name": "Nikon"
         },
         {
-            "@id": "1ccd06e1-1a39-53c2-8e70-86ad7c48ec5c",
+            "@id": "kb:1ccd06e1-1a39-53c2-8e70-86ad7c48ec5c",
             "@type": "uco-observable:ObservableObject",
             "uco-core:hasFacet": [
                 {
-                    "@id": "e26d7f7d-081c-58e5-8990-77ec13d60d89",
+                    "@id": "kb:e26d7f7d-081c-58e5-8990-77ec13d60d89",
                     "@type": "uco-observable:DeviceFacet",
                     "uco-observable:manufacturer": {
-                        "@id": "307df50e-0116-5c51-904c-d5aa69279018"
+                        "@id": "kb:307df50e-0116-5c51-904c-d5aa69279018"
                     },
                     "uco-observable:model": "D750"
                 }
             ]
         },
         {
-            "@id": "fa07818e-5832-5d5f-81b4-f7e143e98252",
+            "@id": "kb:fa07818e-5832-5d5f-81b4-f7e143e98252",
             "@type": "uco-observable:ObservableObject",
             "uco-core:hasFacet": [
                 {
-                    "@id": "9ab260ac-cdf5-5524-9047-3ea85ebfb6e2",
+                    "@id": "kb:9ab260ac-cdf5-5524-9047-3ea85ebfb6e2",
                     "@type": "uco-observable:FileFacet",
                     "uco-observable:fileSystemType": "EXT4",
                     "uco-observable:fileName": "IMG_0123.jpg",
@@ -56,7 +57,7 @@
                     }
                 },
                 {
-                    "@id": "09cab366-d82b-57f8-a94c-9814bf7ef63d",
+                    "@id": "kb:09cab366-d82b-57f8-a94c-9814bf7ef63d",
                     "@type": "uco-observable:ContentDataFacet",
                     "uco-observable:magicNumber": "/9j/ww==",
                     "uco-observable:mimeType": "image/jpg",
@@ -71,7 +72,7 @@
                     },
                     "uco-observable:hash": [
                         {
-                            "@id": "84c0e1ca-a4da-59f3-b60a-096983862089",
+                            "@id": "kb:84c0e1ca-a4da-59f3-b60a-096983862089",
                             "@type": "uco-types:Hash",
                             "uco-types:hashMethod": {
                                 "@type": "uco-vocabulary:HashNameVocab",
@@ -85,7 +86,7 @@
                     ]
                 },
                 {
-                    "@id": "f3ce4eee-0a5d-54a7-9cc7-5ac043234d77",
+                    "@id": "kb:f3ce4eee-0a5d-54a7-9cc7-5ac043234d77",
                     "@type": "uco-observable:RasterPictureFacet",
                     "uco-observable:pictureType": "jpg",
                     "uco-observable:pictureHeight": {
@@ -102,20 +103,20 @@
                     }
                 },
                 {
-                    "@id": "d6585cd5-ad4b-54c3-a649-d45d12d1605d",
+                    "@id": "kb:d6585cd5-ad4b-54c3-a649-d45d12d1605d",
                     "@type": "uco-observable:EXIFFacet",
                     "uco-observable:exifData": {
-                        "@id": "ab4cd39a-dea8-558b-a49e-4aedd9aff7f1",
+                        "@id": "kb:ab4cd39a-dea8-558b-a49e-4aedd9aff7f1",
                         "@type": "uco-types:ControlledDictionary",
                         "uco-types:entry": [
                             {
-                                "@id": "7721bd93-fff7-5e1d-a14e-2d627c399ebe",
+                                "@id": "kb:7721bd93-fff7-5e1d-a14e-2d627c399ebe",
                                 "@type": "uco-types:ControlledDictionaryEntry",
                                 "uco-types:key": "Make",
                                 "uco-types:value": "Canon"
                             },
                             {
-                                "@id": "9ed3e5de-cde8-5cec-a71b-774e485da67d",
+                                "@id": "kb:9ed3e5de-cde8-5cec-a71b-774e485da67d",
                                 "@type": "uco-types:ControlledDictionaryEntry",
                                 "uco-types:key": "Model",
                                 "uco-types:value": "Powershot"
@@ -126,12 +127,12 @@
             ]
         },
         {
-            "@id": "2ed228fb-6c23-567a-8128-c891ccdb0dc6",
+            "@id": "kb:2ed228fb-6c23-567a-8128-c891ccdb0dc6",
             "@type": "uco-identity:Organization",
             "uco-core:name": "Apple"
         },
         {
-            "@id": "268ab394-417e-579a-871b-84947adc9926",
+            "@id": "kb:268ab394-417e-579a-871b-84947adc9926",
             "@type": "case-investigation:InvestigativeAction",
             "uco-core:name": "annotated",
             "uco-action:startTime": {
@@ -144,10 +145,10 @@
             },
             "uco-core:hasFacet": [
                 {
-                    "@id": "102c218a-bc39-52e6-8228-abbc200378cf",
+                    "@id": "kb:102c218a-bc39-52e6-8228-abbc200378cf",
                     "@type": "uco-observable:DeviceFacet",
                     "uco-observable:manufacturer": {
-                        "@id": "2ed228fb-6c23-567a-8128-c891ccdb0dc6"
+                        "@id": "kb:2ed228fb-6c23-567a-8128-c891ccdb0dc6"
                     },
                     "uco-observable:deviceType": "iPhone",
                     "uco-observable:model": "6XS",
@@ -156,12 +157,12 @@
             ]
         },
         {
-            "@id": "f3f8c0fb-6a78-5547-aa4f-7c995d9a8732",
+            "@id": "kb:f3f8c0fb-6a78-5547-aa4f-7c995d9a8732",
             "@type": "uco-identity:Organization",
             "uco-core:name": "oneplus"
         },
         {
-            "@id": "19ff5a9d-1d15-5a6f-858d-28528d5f90d9",
+            "@id": "kb:19ff5a9d-1d15-5a6f-858d-28528d5f90d9",
             "@type": "case-investigation:InvestigativeAction",
             "uco-core:name": "annotated",
             "uco-action:startTime": {
@@ -174,10 +175,10 @@
             },
             "uco-core:hasFacet": [
                 {
-                    "@id": "713d0464-a90c-52f3-88f4-1f0a4a9de091",
+                    "@id": "kb:713d0464-a90c-52f3-88f4-1f0a4a9de091",
                     "@type": "uco-observable:DeviceFacet",
                     "uco-observable:manufacturer": {
-                        "@id": "f3f8c0fb-6a78-5547-aa4f-7c995d9a8732"
+                        "@id": "kb:f3f8c0fb-6a78-5547-aa4f-7c995d9a8732"
                     },
                     "uco-observable:deviceType": "Android",
                     "uco-observable:model": "8",
@@ -186,7 +187,7 @@
             ]
         },
         {
-            "@id": "56004659-8649-5ef2-b2e9-e1dae56877f0",
+            "@id": "kb:56004659-8649-5ef2-b2e9-e1dae56877f0",
             "@type": "uco-observable:ObservableRelationship",
             "uco-core:isDirectional": {
                 "@type": "xsd:boolean",
@@ -194,38 +195,38 @@
             },
             "uco-core:kindOfRelationship": "Contained_Within",
             "uco-core:source": {
-                "@id": "1ccd06e1-1a39-53c2-8e70-86ad7c48ec5c"
+                "@id": "kb:1ccd06e1-1a39-53c2-8e70-86ad7c48ec5c"
             },
             "uco-core:target": {
-                "@id": "fa07818e-5832-5d5f-81b4-f7e143e98252"
+                "@id": "kb:fa07818e-5832-5d5f-81b4-f7e143e98252"
             },
             "uco-core:hasFacet": [
                 {
-                    "@id": "862e79c2-ecab-5798-8c43-09ac916ab0d4",
+                    "@id": "kb:862e79c2-ecab-5798-8c43-09ac916ab0d4",
                     "@type": "uco-observable:PathRelationFacet",
                     "uco-observable:path": "/sdcard/IMG_0123.jpg"
                 }
             ]
         },
         {
-            "@id": "72930cf3-7693-5c80-ae79-ca82151b5d30",
+            "@id": "kb:72930cf3-7693-5c80-ae79-ca82151b5d30",
             "@type": "uco-observable:ObservableObject",
             "uco-core:hasFacet": [
                 {
-                    "@id": "5a33cc98-bf34-5011-82ee-1e664da00d29",
+                    "@id": "kb:5a33cc98-bf34-5011-82ee-1e664da00d29",
                     "@type": "uco-observable:EmailAccountFacet",
                     "uco-observable:emailAddress": {
-                        "@id": "94adcf50-cad5-5a2d-9be3-e1e42d698028"
+                        "@id": "kb:94adcf50-cad5-5a2d-9be3-e1e42d698028"
                     }
                 }
             ]
         },
         {
-            "@id": "94adcf50-cad5-5a2d-9be3-e1e42d698028",
+            "@id": "kb:94adcf50-cad5-5a2d-9be3-e1e42d698028",
             "@type": "uco-observable:ObservableObject",
             "uco-core:hasFacet": [
                 {
-                    "@id": "069043f2-89ee-532e-892b-d90a55ed987c",
+                    "@id": "kb:069043f2-89ee-532e-892b-d90a55ed987c",
                     "@type": "uco-observable:EmailAddressFacet",
                     "uco-observable:addressValue": "info@example.com",
                     "uco-observable:displayName": "Example User"
@@ -233,24 +234,24 @@
             ]
         },
         {
-            "@id": "742fedd8-ec56-5efd-bbae-eac6de464215",
+            "@id": "kb:742fedd8-ec56-5efd-bbae-eac6de464215",
             "@type": "uco-observable:ObservableObject",
             "uco-core:hasFacet": [
                 {
-                    "@id": "1e2a360e-9b34-5fa9-978d-e28c455e59d0",
+                    "@id": "kb:1e2a360e-9b34-5fa9-978d-e28c455e59d0",
                     "@type": "uco-observable:EmailAccountFacet",
                     "uco-observable:emailAddress": {
-                        "@id": "a3f00ca2-db54-51a9-a281-1125bbd37783"
+                        "@id": "kb:a3f00ca2-db54-51a9-a281-1125bbd37783"
                     }
                 }
             ]
         },
         {
-            "@id": "a3f00ca2-db54-51a9-a281-1125bbd37783",
+            "@id": "kb:a3f00ca2-db54-51a9-a281-1125bbd37783",
             "@type": "uco-observable:ObservableObject",
             "uco-core:hasFacet": [
                 {
-                    "@id": "f72553c7-7fa7-5354-aa68-7837e9e7b8c4",
+                    "@id": "kb:f72553c7-7fa7-5354-aa68-7837e9e7b8c4",
                     "@type": "uco-observable:EmailAddressFacet",
                     "uco-observable:addressValue": "admin@example.com",
                     "uco-observable:displayName": "Example Admin"
@@ -258,11 +259,11 @@
             ]
         },
         {
-            "@id": "70e47458-fd7d-594d-816e-272d5bb1e440",
+            "@id": "kb:70e47458-fd7d-594d-816e-272d5bb1e440",
             "@type": "uco-observable:ObservableObject",
             "uco-core:hasFacet": [
                 {
-                    "@id": "60d29bf6-1cb0-5974-866a-2f1d60ee4a51",
+                    "@id": "kb:60d29bf6-1cb0-5974-866a-2f1d60ee4a51",
                     "@type": "uco-observable:EmailMessageFacet",
                     "uco-observable:subject": "Thoughts on Our Next Book Club Pick?",
                     "uco-observable:body": "Hello fellow bookworms! It's that time again.",
@@ -276,54 +277,54 @@
                         "@value": "2023-01-01T01:06:06.000006+00:00"
                     },
                     "uco-observable:from": {
-                        "@id": "94adcf50-cad5-5a2d-9be3-e1e42d698028"
+                        "@id": "kb:94adcf50-cad5-5a2d-9be3-e1e42d698028"
                     },
                     "uco-observable:to": [
                         {
-                            "@id": "94adcf50-cad5-5a2d-9be3-e1e42d698028"
+                            "@id": "kb:94adcf50-cad5-5a2d-9be3-e1e42d698028"
                         },
                         {
-                            "@id": "a3f00ca2-db54-51a9-a281-1125bbd37783"
+                            "@id": "kb:a3f00ca2-db54-51a9-a281-1125bbd37783"
                         }
                     ]
                 }
             ]
         },
         {
-            "@id": "41bc2540-fdd8-5753-864c-00a5de7d0d2e",
+            "@id": "kb:41bc2540-fdd8-5753-864c-00a5de7d0d2e",
             "@type": "uco-observable:ObservableObject",
             "uco-core:hasFacet": [
                 {
-                    "@id": "0f0b71e7-39a8-5249-83a5-b52888d5c8b7",
+                    "@id": "kb:0f0b71e7-39a8-5249-83a5-b52888d5c8b7",
                     "@type": "uco-observable:URLFacet",
                     "uco-observable:fullValue": "www.docker.com/howto"
                 }
             ]
         },
         {
-            "@id": "9af4324d-cb7b-54d7-aba4-95714396435e",
+            "@id": "kb:9af4324d-cb7b-54d7-aba4-95714396435e",
             "@type": "uco-observable:ObservableObject",
             "uco-core:hasFacet": [
                 {
-                    "@id": "d5797860-8d73-5a53-a6fc-660a4e8c64e2",
+                    "@id": "kb:d5797860-8d73-5a53-a6fc-660a4e8c64e2",
                     "@type": "uco-observable:ApplicationFacet",
                     "uco-core:name": "Safari"
                 }
             ]
         },
         {
-            "@id": "997f05df-f309-588d-829f-c20e3cbadb57",
+            "@id": "kb:997f05df-f309-588d-829f-c20e3cbadb57",
             "@type": "uco-observable:ObservableObject",
             "uco-core:hasFacet": [
                 {
-                    "@id": "697d25c6-00bd-571e-aebd-5a96e34ea4b5",
+                    "@id": "kb:697d25c6-00bd-571e-aebd-5a96e34ea4b5",
                     "@type": "uco-observable:URLHistoryFacet",
                     "uco-observable:browserInformation": {
-                        "@id": "9af4324d-cb7b-54d7-aba4-95714396435e"
+                        "@id": "kb:9af4324d-cb7b-54d7-aba4-95714396435e"
                     },
                     "uco-observable:urlHistoryEntry": [
                         {
-                            "@id": "641fc5c4-49a3-573e-bdb2-d6d8dc000fee",
+                            "@id": "kb:641fc5c4-49a3-573e-bdb2-d6d8dc000fee",
                             "@type": "uco-observable:URLHistoryEntry",
                             "uco-observable:browserUserProfile": "Jill",
                             "uco-observable:expirationTime": {
@@ -346,7 +347,7 @@
                             },
                             "uco-observable:pageTitle": "Docker tutorial",
                             "uco-observable:url": {
-                                "@id": "41bc2540-fdd8-5753-864c-00a5de7d0d2e"
+                                "@id": "kb:41bc2540-fdd8-5753-864c-00a5de7d0d2e"
                             },
                             "uco-observable:visitCount": {
                                 "@type": "xsd:integer",
@@ -354,7 +355,7 @@
                             }
                         },
                         {
-                            "@id": "5860f49a-8471-5984-9610-402672d63f56",
+                            "@id": "kb:5860f49a-8471-5984-9610-402672d63f56",
                             "@type": "uco-observable:URLHistoryEntry",
                             "uco-observable:browserUserProfile": "Tamasin",
                             "uco-observable:expirationTime": {
@@ -377,7 +378,7 @@
                             },
                             "uco-observable:pageTitle": "GitHub actions tutorial",
                             "uco-observable:url": {
-                                "@id": "41bc2540-fdd8-5753-864c-00a5de7d0d2e"
+                                "@id": "kb:41bc2540-fdd8-5753-864c-00a5de7d0d2e"
                             },
                             "uco-observable:visitCount": {
                                 "@type": "xsd:integer",
@@ -389,33 +390,33 @@
             ]
         },
         {
-            "@id": "6e0ac6ce-6afc-58c6-b4b6-501fa5de2699",
+            "@id": "kb:6e0ac6ce-6afc-58c6-b4b6-501fa5de2699",
             "@type": "uco-observable:ObservableObject",
             "uco-core:hasFacet": [
                 {
-                    "@id": "00f08d34-2abd-53e3-b758-cd5ba00300c9",
+                    "@id": "kb:00f08d34-2abd-53e3-b758-cd5ba00300c9",
                     "@type": "uco-observable:PhoneAccountFacet",
                     "uco-observable:phoneNumber": "123456"
                 }
             ]
         },
         {
-            "@id": "3d6f634e-7c5d-5ff8-b996-8d738bb2793a",
+            "@id": "kb:3d6f634e-7c5d-5ff8-b996-8d738bb2793a",
             "@type": "uco-observable:ObservableObject",
             "uco-core:hasFacet": [
                 {
-                    "@id": "17525359-a042-5503-ad5f-f8f9bcd53472",
+                    "@id": "kb:17525359-a042-5503-ad5f-f8f9bcd53472",
                     "@type": "uco-observable:PhoneAccountFacet",
                     "uco-observable:phoneNumber": "987654"
                 }
             ]
         },
         {
-            "@id": "1c09087a-0577-5025-a23b-c3e0155a5bf7",
+            "@id": "kb:1c09087a-0577-5025-a23b-c3e0155a5bf7",
             "@type": "uco-observable:ObservableObject",
             "uco-core:hasFacet": [
                 {
-                    "@id": "0336f3a3-ff74-5e34-97bb-14534316f393",
+                    "@id": "kb:0336f3a3-ff74-5e34-97bb-14534316f393",
                     "@type": "uco-observable:MessageFacet",
                     "uco-observable:messageText": "Are you free this weekend?",
                     "uco-observable:sentTime": {
@@ -423,39 +424,39 @@
                         "@value": "2023-01-01T01:08:08.000008+00:00"
                     },
                     "uco-observable:from": {
-                        "@id": "6e0ac6ce-6afc-58c6-b4b6-501fa5de2699"
+                        "@id": "kb:6e0ac6ce-6afc-58c6-b4b6-501fa5de2699"
                     },
                     "uco-observable:to": [
                         {
-                            "@id": "6e0ac6ce-6afc-58c6-b4b6-501fa5de2699"
+                            "@id": "kb:6e0ac6ce-6afc-58c6-b4b6-501fa5de2699"
                         },
                         {
-                            "@id": "3d6f634e-7c5d-5ff8-b996-8d738bb2793a"
+                            "@id": "kb:3d6f634e-7c5d-5ff8-b996-8d738bb2793a"
                         }
                     ],
                     "uco-observable:application": {
-                        "@id": "80c8f41b-e720-51db-b650-1df11b5f2acb"
+                        "@id": "kb:80c8f41b-e720-51db-b650-1df11b5f2acb"
                     }
                 }
             ]
         },
         {
-            "@id": "80c8f41b-e720-51db-b650-1df11b5f2acb",
+            "@id": "kb:80c8f41b-e720-51db-b650-1df11b5f2acb",
             "@type": "uco-observable:ObservableObject",
             "uco-core:hasFacet": [
                 {
-                    "@id": "35fb4ae9-6e55-59b7-a797-6aff1494a314",
+                    "@id": "kb:35fb4ae9-6e55-59b7-a797-6aff1494a314",
                     "@type": "uco-observable:ApplicationFacet",
                     "uco-core:name": "WhatsApp"
                 }
             ]
         },
         {
-            "@id": "6d5906a1-df3f-5aa3-8c0d-c76c570d8b96",
+            "@id": "kb:6d5906a1-df3f-5aa3-8c0d-c76c570d8b96",
             "@type": "uco-identity:Identity",
             "uco-core:hasFacet": [
                 {
-                    "@id": "742d8932-3fe2-5c0f-afc4-9dd2e20533e3",
+                    "@id": "kb:742d8932-3fe2-5c0f-afc4-9dd2e20533e3",
                     "@type": "uco-identity:BirthInformationFacet",
                     "uco-identity:birthdate": {
                         "@type": "xsd:dateTime",
@@ -463,7 +464,7 @@
                     }
                 },
                 {
-                    "@id": "24cd8876-1c97-5fce-9976-8733f6e901f6",
+                    "@id": "kb:24cd8876-1c97-5fce-9976-8733f6e901f6",
                     "@type": "uco-identity:SimpleNameFacet",
                     "uco-identity:givenName": "Davey",
                     "uco-identity:familyName": "Jones"
@@ -471,11 +472,11 @@
             ]
         },
         {
-            "@id": "32599b39-84d2-5471-9452-c494171897fd",
+            "@id": "kb:32599b39-84d2-5471-9452-c494171897fd",
             "@type": "uco-location:Location",
             "uco-core:hasFacet": [
                 {
-                    "@id": "6f716a17-3a29-513a-9e21-8bf6112c1d50",
+                    "@id": "kb:6f716a17-3a29-513a-9e21-8bf6112c1d50",
                     "@type": "uco-location:LatLongCoordinatesFacet",
                     "uco-location:latitude": {
                         "@type": "xsd:decimal",
@@ -489,18 +490,18 @@
             ]
         },
         {
-            "@id": "3344007e-c9c4-5437-9766-4001fc9f3af5",
+            "@id": "kb:3344007e-c9c4-5437-9766-4001fc9f3af5",
             "@type": "case-investigation:Investigation",
             "uco-core:name": "Crime A",
             "case-investigation:focus": "Transfer of Illicit Materials",
             "uco-core:description": "Inquiry into the transfer of illicit materials and the devices used to do so",
             "uco-core:object": [
                 {
-                    "@id": "fa07818e-5832-5d5f-81b4-f7e143e98252",
+                    "@id": "kb:fa07818e-5832-5d5f-81b4-f7e143e98252",
                     "@type": "uco-observable:ObservableObject",
                     "uco-core:hasFacet": [
                         {
-                            "@id": "9ab260ac-cdf5-5524-9047-3ea85ebfb6e2",
+                            "@id": "kb:9ab260ac-cdf5-5524-9047-3ea85ebfb6e2",
                             "@type": "uco-observable:FileFacet",
                             "uco-observable:fileSystemType": "EXT4",
                             "uco-observable:fileName": "IMG_0123.jpg",
@@ -512,7 +513,7 @@
                             }
                         },
                         {
-                            "@id": "09cab366-d82b-57f8-a94c-9814bf7ef63d",
+                            "@id": "kb:09cab366-d82b-57f8-a94c-9814bf7ef63d",
                             "@type": "uco-observable:ContentDataFacet",
                             "uco-observable:magicNumber": "/9j/ww==",
                             "uco-observable:mimeType": "image/jpg",
@@ -527,7 +528,7 @@
                             },
                             "uco-observable:hash": [
                                 {
-                                    "@id": "84c0e1ca-a4da-59f3-b60a-096983862089",
+                                    "@id": "kb:84c0e1ca-a4da-59f3-b60a-096983862089",
                                     "@type": "uco-types:Hash",
                                     "uco-types:hashMethod": {
                                         "@type": "uco-vocabulary:HashNameVocab",
@@ -541,7 +542,7 @@
                             ]
                         },
                         {
-                            "@id": "f3ce4eee-0a5d-54a7-9cc7-5ac043234d77",
+                            "@id": "kb:f3ce4eee-0a5d-54a7-9cc7-5ac043234d77",
                             "@type": "uco-observable:RasterPictureFacet",
                             "uco-observable:pictureType": "jpg",
                             "uco-observable:pictureHeight": {
@@ -558,20 +559,20 @@
                             }
                         },
                         {
-                            "@id": "d6585cd5-ad4b-54c3-a649-d45d12d1605d",
+                            "@id": "kb:d6585cd5-ad4b-54c3-a649-d45d12d1605d",
                             "@type": "uco-observable:EXIFFacet",
                             "uco-observable:exifData": {
-                                "@id": "ab4cd39a-dea8-558b-a49e-4aedd9aff7f1",
+                                "@id": "kb:ab4cd39a-dea8-558b-a49e-4aedd9aff7f1",
                                 "@type": "uco-types:ControlledDictionary",
                                 "uco-types:entry": [
                                     {
-                                        "@id": "7721bd93-fff7-5e1d-a14e-2d627c399ebe",
+                                        "@id": "kb:7721bd93-fff7-5e1d-a14e-2d627c399ebe",
                                         "@type": "uco-types:ControlledDictionaryEntry",
                                         "uco-types:key": "Make",
                                         "uco-types:value": "Canon"
                                     },
                                     {
-                                        "@id": "9ed3e5de-cde8-5cec-a71b-774e485da67d",
+                                        "@id": "kb:9ed3e5de-cde8-5cec-a71b-774e485da67d",
                                         "@type": "uco-types:ControlledDictionaryEntry",
                                         "uco-types:key": "Model",
                                         "uco-types:value": "Powershot"
@@ -582,7 +583,7 @@
                     ]
                 },
                 {
-                    "@id": "268ab394-417e-579a-871b-84947adc9926",
+                    "@id": "kb:268ab394-417e-579a-871b-84947adc9926",
                     "@type": "case-investigation:InvestigativeAction",
                     "uco-core:name": "annotated",
                     "uco-action:startTime": {
@@ -595,10 +596,10 @@
                     },
                     "uco-core:hasFacet": [
                         {
-                            "@id": "102c218a-bc39-52e6-8228-abbc200378cf",
+                            "@id": "kb:102c218a-bc39-52e6-8228-abbc200378cf",
                             "@type": "uco-observable:DeviceFacet",
                             "uco-observable:manufacturer": {
-                                "@id": "2ed228fb-6c23-567a-8128-c891ccdb0dc6"
+                                "@id": "kb:2ed228fb-6c23-567a-8128-c891ccdb0dc6"
                             },
                             "uco-observable:deviceType": "iPhone",
                             "uco-observable:model": "6XS",
@@ -609,7 +610,7 @@
             ]
         },
         {
-            "@id": "bb9cd337-eb51-50dd-9cee-00f9e9acbf94",
+            "@id": "kb:bb9cd337-eb51-50dd-9cee-00f9e9acbf94",
             "@type": "uco-observable:Message",
             "uco-observable:state": "some state",
             "uco-observable:hasChanged": {
@@ -620,45 +621,45 @@
             "olo:slot": null,
             "uco-core:hasFacet": [
                 {
-                    "@id": "73af707b-f00e-5327-8fd4-83467b4441c4",
+                    "@id": "kb:73af707b-f00e-5327-8fd4-83467b4441c4",
                     "@type": "uco-observable:MessageFacet"
                 }
             ]
         },
         {
-            "@id": "7c4d5cff-deb0-5031-b881-c572d6ef2fd7",
+            "@id": "kb:7c4d5cff-deb0-5031-b881-c572d6ef2fd7",
             "@type": "uco-observable:Message",
             "olo:length": null,
             "olo:slot": null,
             "uco-core:hasFacet": [
                 {
-                    "@id": "551338f3-0bb6-5325-a63a-f164f8750a17",
+                    "@id": "kb:551338f3-0bb6-5325-a63a-f164f8750a17",
                     "@type": "uco-observable:MessageFacet"
                 }
             ]
         },
         {
-            "@id": "09b10c04-d04b-5808-a1b6-0392dd3a00e8",
+            "@id": "kb:09b10c04-d04b-5808-a1b6-0392dd3a00e8",
             "@type": "uco-observable:Message",
             "olo:length": null,
             "olo:slot": null,
             "uco-core:hasFacet": [
                 {
-                    "@id": "a19e1e1f-3953-5fb9-92b6-2b46f85752b2",
+                    "@id": "kb:a19e1e1f-3953-5fb9-92b6-2b46f85752b2",
                     "@type": "uco-observable:MessageFacet"
                 }
             ]
         },
         {
-            "@id": "562c20c5-bef7-5919-a969-6c820a80e0d3",
+            "@id": "kb:562c20c5-bef7-5919-a969-6c820a80e0d3",
             "@type": "uco-observable:MessageThread",
             "uco-core:hasFacet": [
                 {
-                    "@id": "6f79d4ae-d92c-5cad-bbe5-a0afde6f475a",
+                    "@id": "kb:6f79d4ae-d92c-5cad-bbe5-a0afde6f475a",
                     "@type": "uco-observable:MessageThreadFacet",
                     "uco-observable:displayName": "some name",
                     "uco-observable:messageThread": {
-                        "@id": "56f74818-1d3d-51f9-8cb1-d6bdc8ecee60",
+                        "@id": "kb:56f74818-1d3d-51f9-8cb1-d6bdc8ecee60",
                         "@type": "uco-types:Thread",
                         "co:size": {
                             "@type": "xsd:nonNegativeInteger",
@@ -666,13 +667,13 @@
                         },
                         "co:element": [
                             {
-                                "@id": "09b10c04-d04b-5808-a1b6-0392dd3a00e8"
+                                "@id": "kb:09b10c04-d04b-5808-a1b6-0392dd3a00e8"
                             },
                             {
-                                "@id": "7c4d5cff-deb0-5031-b881-c572d6ef2fd7"
+                                "@id": "kb:7c4d5cff-deb0-5031-b881-c572d6ef2fd7"
                             },
                             {
-                                "@id": "bb9cd337-eb51-50dd-9cee-00f9e9acbf94"
+                                "@id": "kb:bb9cd337-eb51-50dd-9cee-00f9e9acbf94"
                             }
                         ]
                     }
diff --git a/case_mapping/base.py b/case_mapping/base.py
index 2f789f6..ffc7b9a 100644
--- a/case_mapping/base.py
+++ b/case_mapping/base.py
@@ -1,5 +1,6 @@
 import json
 from datetime import datetime
+from typing import Any
 
 from cdo_local_uuid import local_uuid
 
@@ -20,8 +21,35 @@ def wrapper(self, *args, **kwargs):
 
 
 class FacetEntity(dict):
-    def __init__(self):
-        self["@id"] = str(local_uuid())
+    def __init__(
+        self,
+        *args: Any,
+        prefix_iri: str = "http://example.org/kb/",
+        prefix_label: str = "kb",
+        **kwargs: Any,
+    ) -> None:
+        """
+        :param prefix_iri: The IRI to be concatenated with the prefixed name's local part in order to form the node's absolute IRI.
+        :param prefix_label: The prefix separated from the compact IRI's local name by a colon.
+
+        References
+        ==========
+
+        .. [#turtle_prefixed_name] https://www.w3.org/TR/turtle/#prefixed-name
+
+        Examples
+        ========
+
+        When instantiating a ``FacetEntity``, the JSON dictionary's ``@id`` key will start with the object's ``prefix_label``.
+
+        >>> x = FacetEntity()
+        >>> assert x["@id"][0:3] == "kb:"
+        >>> y = FacetEntity(prefix_label="ex")
+        >>> assert y["@id"][0:3] == "ex:"
+        """
+        self.prefix_iri = prefix_iri
+        self.prefix_label = prefix_label
+        self["@id"] = prefix_label + ":" + str(local_uuid())
 
     def __str__(self):
         return json.dumps(self, indent=4)
@@ -159,6 +187,9 @@ def __handle_var_type_errors(var_name, var_val, expected_type):
 
 
 class ObjectEntity(FacetEntity):
+    def __init__(self, *args: Any, **kwargs: Any) -> None:
+        super().__init__(*args, **kwargs)
+
     @unpack_args_array
     def append_facets(self, *args):
         """
diff --git a/case_mapping/uco/core.py b/case_mapping/uco/core.py
index 29a57ca..d59288c 100644
--- a/case_mapping/uco/core.py
+++ b/case_mapping/uco/core.py
@@ -1,3 +1,5 @@
+from typing import Any
+
 from ..base import ObjectEntity, unpack_args_array
 
 
@@ -8,11 +10,13 @@ def __init__(
         uco_core_name=None,
         spec_version=None,
         description=None,
-    ):
+        *args: Any,
+        **kwargs: Any,
+    ) -> None:
         """
         The main CASE Object for representing a case and its activities and objects.
         """
-        super().__init__()
+        super().__init__(*args, **kwargs)
         self.build = []
         self["@context"] = {
             "@vocab": "http://caseontology.org/core#",
@@ -31,6 +35,17 @@ def __init__(
             "uco-vocabulary": "https://ontology.unifiedcyberontology.org/uco/vocabulary/",
             "xsd": "http://www.w3.org/2001/XMLSchema#",
         }
+
+        # Assign caller-selectible prefix label and IRI, after checking
+        # for conflicts with hard-coded prefixes.
+        # https://www.w3.org/TR/turtle/#prefixed-name
+        if self.prefix_label in self["@context"]:
+            raise ValueError(
+                "Requested prefix label already in use in hard-coded dictionary: '%s'.  Please revise caller to use another label."
+                % self.prefix_label
+            )
+        self["@context"][self.prefix_label] = self.prefix_iri
+
         self["@type"] = "uco-core:Bundle"
         self._str_vars(
             **{
diff --git a/case_mapping/uco/observable.py b/case_mapping/uco/observable.py
index 2fb00ba..58e347d 100644
--- a/case_mapping/uco/observable.py
+++ b/case_mapping/uco/observable.py
@@ -269,7 +269,10 @@ def __init__(
             }
 
         if hash_method is not None or hash_value is not None or hash_value != "-":
-            data = {"@id": str(local_uuid()), "@type": "uco-types:Hash"}
+            data = {
+                "@id": self.prefix_label + ":" + str(local_uuid()),
+                "@type": "uco-types:Hash",
+            }
             if hash_method is not None:
                 data["uco-types:hashMethod"] = {
                     "@type": "uco-vocabulary:HashNameVocab",
@@ -416,7 +419,7 @@ def __init__(self, browser=None, history_entries=None):
         self["uco-observable:urlHistoryEntry"] = []
         for entry in history_entries:
             history_entry = {}
-            history_entry["@id"] = local_uuid()
+            history_entry["@id"] = self.prefix_label + ":" + local_uuid()
             history_entry["@type"] = "uco-observable:URLHistoryEntry"
             for key, var in entry.items():
                 if key in keys_str:
@@ -858,14 +861,14 @@ def __init__(self, **kwargs):
         self["@type"] = "uco-observable:EXIFFacet"
 
         self["uco-observable:exifData"] = {
-            "@id": str(local_uuid()),
+            "@id": self.prefix_label + ":" + str(local_uuid()),
             "@type": "uco-types:ControlledDictionary",
             "uco-types:entry": [],
         }
         for k, v in kwargs.items():
             if v not in ["", " "]:
                 item = {
-                    "@id": str(local_uuid()),
+                    "@id": self.prefix_label + ":" + str(local_uuid()),
                     "@type": "uco-types:ControlledDictionaryEntry",
                     "uco-types:key": k,
                     "uco-types:value": v,
@@ -1356,7 +1359,7 @@ def __init__(
         self._node_reference_vars(**{"uco-observable:participant": participants})
 
         self["uco-observable:messageThread"] = {
-            "@id": str(local_uuid()),
+            "@id": self.prefix_label + ":" + local_uuid(),
             "@type": "uco-types:Thread",
         }