{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://windi-domain.com/specs/market-schema-skill-certification.json",
  "title": "WINDI Skill Certification Market Schema",
  "description": "Schema for professional skill and competency certification",
  "type": "object",
  "properties": {
    "sector": {
      "const": "SKILL_CERTIFICATION",
      "description": "Market sector identifier"
    },
    "certification_type": {
      "type": "string",
      "enum": ["professional_license", "competency_certificate", "training_completion", "skill_assessment", "language_proficiency", "safety_certification"],
      "description": "Type of skill certification"
    },
    "subject": {
      "type": "object",
      "properties": {
        "name": { "type": "string" },
        "did": { "type": "string", "pattern": "^did:windi:" },
        "wallet_id": { "type": "string", "pattern": "^wal_" }
      },
      "required": ["name"]
    },
    "certification": {
      "type": "object",
      "properties": {
        "skill_name": { "type": "string" },
        "skill_level": { "type": "string", "enum": ["BEGINNER", "INTERMEDIATE", "ADVANCED", "EXPERT", "MASTER"] },
        "issuing_authority": { "type": "string" },
        "issuer_did": { "type": "string", "pattern": "^did:windi:" },
        "issue_date": { "type": "string", "format": "date" },
        "expiry_date": { "type": "string", "format": "date" },
        "credential_id": { "type": "string" }
      },
      "required": ["skill_name", "skill_level", "issuing_authority", "issue_date"]
    },
    "attestation": {
      "type": "object",
      "properties": {
        "seal_date": { "type": "string", "format": "date-time" },
        "content_hash": { "type": "string", "pattern": "^sha256:" },
        "tier": { "type": "string", "enum": ["SEED", "NODAL", "SOVEREIGN", "ORACLE"] },
        "verification_url": { "type": "string", "format": "uri" }
      },
      "required": ["seal_date", "content_hash", "tier"]
    },
    "compliance": {
      "type": "object",
      "properties": {
        "gdpr_compliant": { "type": "boolean" },
        "eidas_level": { "type": "string", "enum": ["LOW", "SUBSTANTIAL", "HIGH"] },
        "portable": { "type": "boolean", "description": "Can be used across EU jurisdictions" }
      }
    }
  },
  "required": ["sector", "certification_type", "subject", "certification", "attestation"]
}