diff --git a/model/Core/Vocabularies/ExternalRefType.md b/model/Core/Vocabularies/ExternalRefType.md
index 8d135926a..0e7e9ca33 100644
--- a/model/Core/Vocabularies/ExternalRefType.md
+++ b/model/Core/Vocabularies/ExternalRefType.md
@@ -62,3 +62,4 @@ ExternalRefType specifies the type of an external reference.
 - vcs: A reference to a version control system related to a software artifact.
 - vulnerabilityDisclosureReport: A reference to a Vulnerability Disclosure Report (VDR) which provides the software supplier's analysis and findings describing the impact (or lack of impact) that reported vulnerabilities have on packages or products in the supplier's SBOM as defined in [NIST SP 800-161 Cybersecurity Supply Chain Risk Management Practices for Systems and Organizations](https://csrc.nist.gov/pubs/sp/800/161/r1/final).
 - vulnerabilityExploitabilityAssessment: A reference to a Vulnerability Exploitability eXchange (VEX) statement which provides information on whether a product is impacted by a specific vulnerability in an included package and, if affected, whether there are actions recommended to remediate. See also [NTIA VEX one-page summary](https://ntia.gov/files/ntia/publications/vex_one-page_summary.pdf).
+- x509Cert: A reference to an X.509 certificate as defined in [RFC 1422](https://datatracker.ietf.org/doc/rfc1422/). The media type should be one of application/x-x509-ca-cert or application/x-x509-user-cert.
diff --git a/model/Service/Classes/ServiceProvider.md b/model/Service/Classes/ServiceProvider.md
index ab6a6c660..72940bbe5 100644
--- a/model/Service/Classes/ServiceProvider.md
+++ b/model/Service/Classes/ServiceProvider.md
@@ -13,5 +13,5 @@ A ServiceProvider is an entity that provide a software service.
 ## Metadata
 
 - name: ServiceProvider
-- SubclassOf: Agent
+- SubclassOf: /Core/Agent
 - Instantiability: Concrete
diff --git a/model/Service/Classes/SoftwareService.md b/model/Service/Classes/SoftwareService.md
index 793284fc5..d984da19a 100644
--- a/model/Service/Classes/SoftwareService.md
+++ b/model/Service/Classes/SoftwareService.md
@@ -13,7 +13,7 @@ SoftwareService represents software being licensed, delivered and accessed onlin
 ## Properties
 
 - provider
-  - type: Agent
+  - type: /Core/Agent
   - minCount: 1
 - serverAuthenticationProtocol
   - type: AuthenticationProtocolType
@@ -22,5 +22,5 @@ SoftwareService represents software being licensed, delivered and accessed onlin
 ## Metadata
 
 - name: SoftwareService
-- SubclassOf: Element
+- SubclassOf: /Core/Element
 - Instantiability: Concrete
diff --git a/model/Service/Properties/provider.md b/model/Service/Properties/provider.md
index 54fba59e9..a3cc83f67 100644
--- a/model/Service/Properties/provider.md
+++ b/model/Service/Properties/provider.md
@@ -14,4 +14,4 @@ The Agent that provides a SoftwareService to one or more consumers.
 
 - name: provider
 - Nature: ObjectProperty
-- Range: Agent
+- Range: /Core/Agent