curl -X GET "https://api.omophub.com/v1/vocabularies/SNOMED/metadata?include_changelog=true&include_licensing=true" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json"

{
  "success": true,
  "data": {
    "vocabulary_id": "SNOMED",
    "vocabulary_name": "Systematized Nomenclature of Medicine Clinical Terms",
    "vocabulary_reference": "https://www.snomed.org/",
    "vocabulary_version": "2024.2",
    "vocabulary_concept_id": 44819096,
    "release_info": {
      "current_version": "2024.2",
      "release_date": "2024-03-01T00:00:00Z",
      "next_expected_release": "2024-07-01T00:00:00Z",
      "release_frequency": "Bi-annual (January and July)",
      "schema_name": "vocabs_2024_1"
    },
    "content_info": {
      "total_concepts": 354652,
      "standard_concepts": 298456,
      "classification_concepts": 56196,
      "primary_domains": [
        "Condition",
        "Procedure",
        "Observation",
        "Specimen",
        "Measurement"
      ],
      "concept_classes": [
        "Clinical Finding",
        "Procedure",
        "Observable Entity",
        "Body Structure",
        "Substance",
        "Pharmaceutical / biologic product"
      ],
      "languages_supported": [
        "en-US",
        "en-GB",
        "es-ES",
        "fr-FR",
        "de-DE"
      ]
    },
    "organization_info": {
      "maintaining_organization": "SNOMED International",
      "contact_info": "info@snomed.org",
      "official_website": "https://www.snomed.org/",
      "documentation_url": "https://confluence.ihtsdotools.org/"
    },
    "licensing_info": {
      "license_type": "Commercial with Free Tier",
      "license_description": "Free for SNOMED International member countries, commercial licensing available for others",
      "attribution_required": true,
      "commercial_use_allowed": true,
      "license_url": "https://www.snomed.org/snomed-ct/get-snomed"
    },
    "technical_info": {
      "encoding": "UTF-8",
      "file_formats": [
        "RF2 (Release Format 2)",
        "JSON",
        "XML",
        "CSV"
      ],
      "api_endpoints": [
        "/v1/concepts",
        "/v1/concepts/:id/ancestors",
        "/v1/concepts/:id/descendants",
        "/v1/concepts/search"
      ],
      "identifier_format": "SCTID (SNOMED CT Identifier) - up to 18 digits",
      "hierarchy_depth": {
        "max_depth": 15,
        "average_depth": 6.8,
        "deepest_path": "Clinical finding > Disease > Cardiovascular disease > ..."
      }
    },
    "changelog": [
      {
        "version": "2024.2",
        "change_date": "2024-03-01T00:00:00Z",
        "change_type": "Added",
        "description": "New concepts for COVID-19 variants and long COVID conditions",
        "affected_concepts": 247
      },
      {
        "version": "2024.2",
        "change_date": "2024-03-01T00:00:00Z",
        "change_type": "Modified",
        "description": "Updated relationships for cardiovascular procedure concepts",
        "affected_concepts": 1523
      },
      {
        "version": "2024-01",
        "change_date": "2024-01-01T00:00:00Z",
        "change_type": "Deprecated",
        "description": "Deprecated outdated medication concepts",
        "affected_concepts": 89
      }
    ]
  },
  "meta": {
    "request_id": "req_snomed_metadata_123",
    "timestamp": "2024-01-15T10:30:00Z",
    "vocab_release": "2025.2"
  }
}