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    "displayName": "Semantic Data Charter",
    "identifier": "https://semanticdatacharter.com",
    "documentationUrl": "https://semanticdatacharter.com/"
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      "url": "https://github.com/SemanticDataCharter/sdcvalidator",
      "description": "Validates XML data instances against SDC4 XSD schemas, classifying errors as structural (Tier 1: reject) versus semantic (Tier 2: report) and enforcing SDC4 restriction-only derivation (no xsd:extension). Self-hosted MCP server over stdio: pip install sdcvalidator, then run 'sdcvalidator-mcp serve --mcp'.",
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      "tags": ["sdc", "validation", "xsd", "mcp", "interoperability", "open-source"],
      "capabilities": ["validate_instance", "validate_and_report", "check_schema_compliance"],
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        "validate an XML instance against an SDC4 schema",
        "check whether a data model uses xsd:restriction instead of xsd:extension",
        "report structural versus semantic errors for an SDC instance",
        "is this data instance structurally valid"
      ],
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        "pypi": "sdcvalidator",
        "license": "Apache-2.0",
        "language": "Python",
        "repository": "https://github.com/SemanticDataCharter/sdcvalidator",
        "mcpInvocation": "sdcvalidator-mcp serve --mcp",
        "deployment": "self-hosted-stdio"
      },
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            "type": "Standards-Conformance",
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      "displayName": "SDC Governance Engine (sdcgovernance)",
      "type": "application/mcp-server-card+json",
      "url": "https://github.com/SemanticDataCharter/sdcgovernance",
      "description": "W3C standards-based governance advisory engine for SDC data instances. Returns OASIS XACML decisions (PERMIT, DENY, INDETERMINATE) with a SHA-256 hash-chained tamper-evident receipt and a W3C PROV record. Self-hosted MCP server over stdio: pip install sdcgovernance, then run 'sdcgovernance serve --mcp'.",
      "version": "4.0.4",
      "tags": ["sdc", "governance", "provenance", "xacml", "mcp", "audit", "attestation", "open-source"],
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        "get_allowed_transitions",
        "evaluate_transition",
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        "evaluate_decision",
        "verify_evidence_pack"
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        "is this workflow state transition permitted",
        "produce a tamper-evident decision receipt for an agent action",
        "evaluate an agent action against governance policy and return PERMIT or DENY"
      ],
      "metadata": {
        "pypi": "sdcgovernance",
        "license": "Apache-2.0",
        "language": "Python",
        "repository": "https://github.com/SemanticDataCharter/sdcgovernance",
        "mcpInvocation": "sdcgovernance serve --mcp",
        "deployment": "self-hosted-stdio",
        "standards": "OASIS-XACML, W3C-PROV-O, W3C-SHACL, OMG-DMN, W3C-DPV, W3C-ActivityStreams-2.0, W3C-VC-2.0, SHA-256"
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          },
          {
            "type": "Governance-Engine-Overview",
            "uri": "https://semanticdatacharter.com/governance.html",
            "mediaType": "text/html"
          }
        ],
        "provenance": [
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    }
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}