diff --git a/inspector-vc/src/main/java/org/oneedtech/inspect/vc/Assertion.java b/inspector-vc/src/main/java/org/oneedtech/inspect/vc/Assertion.java
index 76e75d8..9769561 100644
--- a/inspector-vc/src/main/java/org/oneedtech/inspect/vc/Assertion.java
+++ b/inspector-vc/src/main/java/org/oneedtech/inspect/vc/Assertion.java
@@ -148,6 +148,14 @@ public class Assertion extends Credential {
         public List<Validation> getValidations() {
             return validationMap.get(this);
         }
+        @Override
+        public Map<String, List<String>> getContextAliases() {
+            return Collections.emptyMap();
+        }
+        @Override
+        public Map<String, List<String>> getContextVersionPatterns() {
+            return Collections.emptyMap();
+        }
 	}
 
     public enum ValueType {
diff --git a/inspector-vc/src/main/java/org/oneedtech/inspect/vc/Credential.java b/inspector-vc/src/main/java/org/oneedtech/inspect/vc/Credential.java
index 84e1c9b..d33b3fd 100644
--- a/inspector-vc/src/main/java/org/oneedtech/inspect/vc/Credential.java
+++ b/inspector-vc/src/main/java/org/oneedtech/inspect/vc/Credential.java
@@ -92,6 +92,8 @@ public abstract class Credential extends GeneratedObject {
         List<String> getAllowedTypeValues();
         boolean isAllowedTypeValuesRequired();
         List<String> getContextUris();
+        Map<String, List<String>> getContextAliases();
+        Map<String, List<String>> getContextVersionPatterns();
         String toString();
     }
 
diff --git a/inspector-vc/src/main/java/org/oneedtech/inspect/vc/VerifiableCredential.java b/inspector-vc/src/main/java/org/oneedtech/inspect/vc/VerifiableCredential.java
index 2b29f9f..9e93b9c 100644
--- a/inspector-vc/src/main/java/org/oneedtech/inspect/vc/VerifiableCredential.java
+++ b/inspector-vc/src/main/java/org/oneedtech/inspect/vc/VerifiableCredential.java
@@ -53,17 +53,24 @@ public class VerifiableCredential extends Credential  {
 	private static final Map<Set<VerifiableCredential.Type>, List<String>> contextMap = new ImmutableMap.Builder<Set<VerifiableCredential.Type>, List<String>>()
 			.put(Set.of(Type.OpenBadgeCredential, AchievementCredential, EndorsementCredential),
 					List.of("https://www.w3.org/2018/credentials/v1",
-							//"https://purl.imsglobal.org/spec/ob/v3p0/context.json")) //dev legacy
 							"https://purl.imsglobal.org/spec/ob/v3p0/context.json"))
 			.put(Set.of(ClrCredential),
 					List.of("https://www.w3.org/2018/credentials/v1",
-		//							"https://dc.imsglobal.org/draft/clr/v2p0/context", //dev legacy
-		//							"https://purl.imsglobal.org/spec/ob/v3p0/context.json")) //dev legacy
 							"https://purl.imsglobal.org/spec/clr/v2p0/context.json",
 							"https://purl.imsglobal.org/spec/ob/v3p0/context.json"))
 
 			.build();
 
+	private static final Map<String, List<String>> contextAliasesMap = new ImmutableMap.Builder<String, List<String>>()
+			.put("https://purl.imsglobal.org/spec/ob/v3p0/context.json",
+					List.of("https://purl.imsglobal.org/spec/ob/v3p0/context/ob_v3p0.jsonld"))
+			.build();
+
+	private static final Map<String, List<String>> contextVersioningPatternMap = new ImmutableMap.Builder<String, List<String>>()
+			.put("https://purl.imsglobal.org/spec/ob/v3p0/context.json",
+					List.of("https:\\/\\/purl\\.imsglobal\\.org\\/spec\\/ob\\/v3p0\\/context(-\\d+\\.\\d+\\.\\d+)*\\.json"))
+			.build();
+
 	public enum Type implements CredentialEnum {
 		AchievementCredential(Collections.emptyList()),
 		OpenBadgeCredential(List.of("OpenBadgeCredential", "AchievementCredential")), 	//treated as an alias of AchievementCredential
@@ -119,6 +126,14 @@ public class VerifiableCredential extends Credential  {
 				.findFirst()
 				.orElseThrow(()-> new IllegalArgumentException(this.name() + " not recognized")));
 		}
+		@Override
+		public Map<String, List<String>> getContextAliases() {
+			return contextAliasesMap;
+		}
+		@Override
+		public Map<String, List<String>> getContextVersionPatterns() {
+			return contextVersioningPatternMap;
+		}
 	}
 
 	public enum ProofType {