{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://poliklot.github.io/bridge-design-methodology/schema/bridge.schema.json",
  "title": "DFC Bridge structured transfer contract",
  "description": "Versioned, target-independent DFC Bridge metadata. Layer-name tags remain compact anchors; rich contracts live under the bridge namespace.",
  "type": "object",
  "additionalProperties": false,
  "required": [
    "bridge"
  ],
  "properties": {
    "$schema": {
      "type": "string"
    },
    "bridge": {
      "$ref": "#/$defs/bridge"
    }
  },
  "$defs": {
    "id": {
      "type": "string",
      "pattern": "^[A-Za-z0-9]+(?:[._:/-][A-Za-z0-9*]+)*$"
    },
    "nonEmpty": {
      "type": "string",
      "minLength": 1
    },
    "semver": {
      "type": "string",
      "pattern": "^(?:0|[1-9][0-9]*)\\.(?:0|[1-9][0-9]*)\\.(?:0|[1-9][0-9]*)$"
    },
    "uriReference": {
      "type": "string",
      "minLength": 1
    },
    "ref": {
      "$ref": "#/$defs/id"
    },
    "refList": {
      "type": "array",
      "uniqueItems": true,
      "items": {
        "$ref": "#/$defs/ref"
      }
    },
    "extensionObject": {
      "type": "object",
      "additionalProperties": true
    },
    "bridge": {
      "type": "object",
      "additionalProperties": true,
      "required": [
        "contractVersion",
        "methodologyVersion",
        "rulesVersion",
        "source",
        "context",
        "identity"
      ],
      "properties": {
        "contractVersion": {
          "$ref": "#/$defs/semver",
          "const": "0.2.0"
        },
        "methodologyVersion": {
          "$ref": "#/$defs/semver"
        },
        "rulesVersion": {
          "$ref": "#/$defs/semver"
        },
        "source": {
          "$ref": "#/$defs/source"
        },
        "context": {
          "$ref": "#/$defs/context"
        },
        "identity": {
          "$ref": "#/$defs/identity"
        },
        "structure": {
          "$ref": "#/$defs/structure"
        },
        "data": {
          "$ref": "#/$defs/data"
        },
        "responsive": {
          "$ref": "#/$defs/responsive"
        },
        "interaction": {
          "$ref": "#/$defs/interaction"
        },
        "motion": {
          "$ref": "#/$defs/motion"
        },
        "accessibility": {
          "$ref": "#/$defs/accessibility"
        },
        "lifecycle": {
          "$ref": "#/$defs/lifecycle"
        },
        "exceptions": {
          "type": "array",
          "items": {
            "$ref": "#/$defs/exception"
          }
        },
        "openQuestions": {
          "type": "array",
          "items": {
            "$ref": "#/$defs/openQuestion"
          }
        },
        "capabilities": {
          "$ref": "#/$defs/capabilities"
        }
      }
    },
    "source": {
      "type": "object",
      "additionalProperties": true,
      "minProperties": 1,
      "properties": {
        "tool": {
          "$ref": "#/$defs/nonEmpty"
        },
        "documentId": {
          "$ref": "#/$defs/nonEmpty"
        },
        "revision": {
          "$ref": "#/$defs/nonEmpty"
        },
        "exportedAt": {
          "type": "string",
          "format": "date-time"
        }
      }
    },
    "context": {
      "type": "object",
      "additionalProperties": true,
      "minProperties": 1,
      "properties": {
        "project": {
          "$ref": "#/$defs/nonEmpty"
        },
        "product": {
          "$ref": "#/$defs/nonEmpty"
        },
        "page": {
          "$ref": "#/$defs/id"
        },
        "route": {
          "$ref": "#/$defs/nonEmpty"
        },
        "targets": {
          "type": "array",
          "items": {
            "$ref": "#/$defs/nonEmpty"
          },
          "uniqueItems": true
        },
        "scope": {
          "$ref": "#/$defs/sectionScope"
        },
        "externalDependencies": {
          "type": "array",
          "uniqueItems": true,
          "items": {
            "$ref": "#/$defs/externalDependency"
          }
        }
      }
    },
    "sectionScope": {
      "type": "object",
      "additionalProperties": true,
      "required": [
        "kind",
        "rootIdentity",
        "boundary",
        "assetBoundary",
        "hostCompliance",
        "selectionMode",
        "contextIds",
        "readinessClaim"
      ],
      "properties": {
        "kind": {
          "const": "section"
        },
        "rootIdentity": {
          "$ref": "#/$defs/ref"
        },
        "boundary": {
          "const": "selected-subtree"
        },
        "assetBoundary": {
          "enum": [
            "none",
            "selected-root-opaque"
          ]
        },
        "hostCompliance": {
          "enum": [
            "legacy-out-of-scope",
            "bridge-out-of-scope",
            "unknown-out-of-scope"
          ]
        },
        "selectionMode": {
          "enum": [
            "single-root",
            "explicit-variants"
          ]
        },
        "contextIds": {
          "type": "array",
          "minItems": 1,
          "uniqueItems": true,
          "items": {
            "$ref": "#/$defs/ref"
          }
        },
        "readinessClaim": {
          "const": "section-source-only"
        }
      },
      "allOf": [
        {
          "if": {
            "properties": {
              "selectionMode": {
                "const": "single-root"
              }
            },
            "required": [
              "selectionMode"
            ]
          },
          "then": {
            "properties": {
              "contextIds": {
                "type": "array",
                "maxItems": 1
              }
            }
          }
        },
        {
          "if": {
            "properties": {
              "selectionMode": {
                "const": "explicit-variants"
              }
            },
            "required": [
              "selectionMode"
            ]
          },
          "then": {
            "properties": {
              "contextIds": {
                "type": "array",
                "minItems": 2
              }
            }
          }
        }
      ]
    },
    "externalDependency": {
      "type": "object",
      "additionalProperties": true,
      "required": [
        "id",
        "kind",
        "reference",
        "status",
        "owner"
      ],
      "properties": {
        "id": {
          "$ref": "#/$defs/id"
        },
        "kind": {
          "enum": [
            "route",
            "anchor",
            "modal",
            "state",
            "form",
            "reset",
            "component",
            "data",
            "host-layout",
            "other"
          ]
        },
        "reference": {
          "$ref": "#/$defs/nonEmpty"
        },
        "status": {
          "enum": [
            "resolved",
            "deferred",
            "unverified"
          ]
        },
        "owner": {
          "$ref": "#/$defs/owner"
        },
        "contractUri": {
          "$ref": "#/$defs/uriReference"
        },
        "reviewAt": {
          "$ref": "#/$defs/nonEmpty"
        },
        "evidence": {
          "$ref": "#/$defs/refList"
        }
      },
      "allOf": [
        {
          "if": {
            "properties": {
              "status": {
                "const": "resolved"
              }
            },
            "required": [
              "status"
            ]
          },
          "then": {
            "required": [
              "contractUri"
            ]
          }
        },
        {
          "if": {
            "properties": {
              "status": {
                "enum": [
                  "deferred",
                  "unverified"
                ]
              }
            },
            "required": [
              "status"
            ]
          },
          "then": {
            "required": [
              "reviewAt"
            ]
          }
        }
      ]
    },
    "identity": {
      "type": "object",
      "additionalProperties": true,
      "required": [
        "elements"
      ],
      "properties": {
        "elements": {
          "type": "array",
          "minItems": 1,
          "items": {
            "$ref": "#/$defs/identityElement"
          }
        }
      }
    },
    "identityElement": {
      "type": "object",
      "additionalProperties": true,
      "required": [
        "bridgeKey",
        "role",
        "designInstance"
      ],
      "properties": {
        "bridgeKey": {
          "$ref": "#/$defs/id"
        },
        "role": {
          "$ref": "#/$defs/role"
        },
        "template": {
          "$ref": "#/$defs/templateIdentity"
        },
        "designInstance": {
          "$ref": "#/$defs/designInstance"
        },
        "runtimeData": {
          "$ref": "#/$defs/runtimeIdentity"
        },
        "target": {
          "$ref": "#/$defs/targetIdentity"
        }
      }
    },
    "role": {
      "type": "object",
      "additionalProperties": true,
      "required": [
        "kind"
      ],
      "properties": {
        "kind": {
          "$ref": "#/$defs/id"
        },
        "semantics": {
          "$ref": "#/$defs/nonEmpty"
        }
      }
    },
    "templateIdentity": {
      "type": "object",
      "additionalProperties": true,
      "required": [
        "templateKey"
      ],
      "properties": {
        "templateKey": {
          "$ref": "#/$defs/id"
        },
        "sourceComponentId": {
          "$ref": "#/$defs/nonEmpty"
        },
        "sourceComponentName": {
          "$ref": "#/$defs/nonEmpty"
        }
      }
    },
    "designInstance": {
      "type": "object",
      "additionalProperties": true,
      "required": [
        "designInstanceKey",
        "sourceNodes"
      ],
      "properties": {
        "designInstanceKey": {
          "$ref": "#/$defs/id"
        },
        "sourceNodes": {
          "type": "array",
          "minItems": 1,
          "items": {
            "$ref": "#/$defs/sourceNode"
          }
        }
      }
    },
    "sourceNode": {
      "type": "object",
      "additionalProperties": true,
      "required": [
        "contextId",
        "nodeId",
        "layerPath"
      ],
      "properties": {
        "contextId": {
          "$ref": "#/$defs/ref"
        },
        "nodeId": {
          "$ref": "#/$defs/nonEmpty"
        },
        "layerPath": {
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            {
              "$ref": "#/$defs/nonEmpty"
            },
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              "type": "array",
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              "items": {
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              }
            }
          ]
        }
      }
    },
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      "type": "object",
      "additionalProperties": true,
      "required": [
        "collection",
        "keyField"
      ],
      "properties": {
        "collection": {
          "$ref": "#/$defs/id"
        },
        "keyField": {
          "$ref": "#/$defs/id"
        },
        "fixtureKey": {
          "$ref": "#/$defs/id"
        },
        "runtimeDataKey": {
          "$ref": "#/$defs/nonEmpty"
        }
      }
    },
    "targetIdentity": {
      "type": "object",
      "additionalProperties": true,
      "required": [
        "platform",
        "kind",
        "targetKey"
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        "locator": {
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        }
      }
    },
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      "additionalProperties": true,
      "required": [
        "contexts"
      ],
      "properties": {
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          "minItems": 1,
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          }
        }
      }
    },
    "structureContext": {
      "type": "object",
      "additionalProperties": true,
      "required": [
        "id",
        "rootIdentity",
        "tree"
      ],
      "properties": {
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          "$ref": "#/$defs/id"
        },
        "rootIdentity": {
          "$ref": "#/$defs/ref"
        },
        "tree": {
          "$ref": "#/$defs/treeNode"
        }
      }
    },
    "treeNode": {
      "oneOf": [
        {
          "$ref": "#/$defs/ref"
        },
        {
          "type": "object",
          "additionalProperties": true,
          "required": [
            "identity"
          ],
          "properties": {
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              "$ref": "#/$defs/ref"
            },
            "children": {
              "type": "array",
              "items": {
                "$ref": "#/$defs/treeNode"
              }
            }
          }
        },
        {
          "$ref": "#/$defs/treeMap"
        }
      ]
    },
    "data": {
      "type": "object",
      "additionalProperties": true,
      "required": [
        "displays"
      ],
      "properties": {
        "displays": {
          "type": "array",
          "items": {
            "$ref": "#/$defs/dataDisplay"
          }
        }
      }
    },
    "dataDisplay": {
      "type": "object",
      "additionalProperties": true,
      "required": [
        "displayId",
        "purpose",
        "source",
        "states"
      ],
      "properties": {
        "displayId": {
          "$ref": "#/$defs/ref"
        },
        "purpose": {
          "$ref": "#/$defs/nonEmpty"
        },
        "source": {
          "$ref": "#/$defs/extensionObject"
        },
        "dimensions": {
          "type": "array",
          "items": {
            "$ref": "#/$defs/extensionObject"
          }
        },
        "measures": {
          "type": "array",
          "items": {
            "$ref": "#/$defs/extensionObject"
          }
        },
        "format": {
          "$ref": "#/$defs/extensionObject"
        },
        "states": {
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          "minItems": 1,
          "uniqueItems": true,
          "items": {
            "$ref": "#/$defs/id"
          }
        },
        "accessibleEquivalent": {
          "$ref": "#/$defs/ref"
        }
      }
    },
    "responsive": {
      "type": "object",
      "additionalProperties": true,
      "required": [
        "defaultPolicy",
        "contexts"
      ],
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          "const": "same-tree"
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          "items": {
            "$ref": "#/$defs/responsiveContext"
          }
        },
        "transformations": {
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          "items": {
            "$ref": "#/$defs/responsiveTransformation"
          }
        }
      }
    },
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      "type": "object",
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        "id",
        "driver"
      ],
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        },
        "driver": {
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            "viewport",
            "container"
          ]
        },
        "width": {
          "type": "number",
          "exclusiveMinimum": 0
        },
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          "$ref": "#/$defs/nonEmpty"
        },
        "labelSource": {
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            "declared",
            "inferred-from-selected-root-width"
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      }
    },
    "responsiveTransformation": {
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      "additionalProperties": true,
      "required": [
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        "toContext",
        "when",
        "mappings",
        "preserves"
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        },
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                "container"
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            "required": [
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              "target",
              "semantics"
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              "source": {
                "$ref": "#/$defs/refList"
              },
              "target": {
                "$ref": "#/$defs/refList"
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                "$ref": "#/$defs/nonEmpty"
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          "items": {
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        },
        "focusOrder": {
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        "readingOrder": {
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        "stateTransfer": {
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            {
              "$ref": "#/$defs/nonEmpty"
            },
            {
              "$ref": "#/$defs/extensionObject"
            }
          ]
        },
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              "$ref": "#/$defs/nonEmpty"
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    },
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      "additionalProperties": true,
      "required": [
        "stateMachines"
      ],
      "properties": {
        "stateMachines": {
          "type": "array",
          "items": {
            "$ref": "#/$defs/stateMachine"
          }
        }
      }
    },
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        "initial",
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        "transitions"
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        {
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        {
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            },
            {
              "$ref": "#/$defs/extensionObject"
            }
          ]
        },
        "pending": {
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        "outcomes": {
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              "type": "array",
              "minItems": 1,
              "items": {
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            {
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              "additionalProperties": {
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              }
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          ]
        },
        "to": {
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        },
        "effects": {
          "type": "array",
          "items": {
            "$ref": "#/$defs/extensionObject"
          }
        },
        "feedback": {
          "$ref": "#/$defs/extensionObject"
        },
        "focus": {
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              "$ref": "#/$defs/nonEmpty"
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            {
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        "concurrency": {
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        "persistence": {
          "$ref": "#/$defs/extensionObject"
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    },
    "motion": {
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      "additionalProperties": true,
      "required": [
        "sequences"
      ],
      "properties": {
        "sequences": {
          "type": "array",
          "items": {
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          }
        }
      }
    },
    "motionSequence": {
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      "additionalProperties": true,
      "required": [
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        "reducedMotion"
      ],
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          "additionalProperties": true,
          "required": [
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          "properties": {
            "type": {
              "enum": [
                "time",
                "user-event",
                "scroll-progress",
                "scroll-threshold",
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                "media",
                "data",
                "system"
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        },
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        },
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            "$ref": "#/$defs/extensionObject"
          }
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          "$ref": "#/$defs/nonEmpty"
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          "$ref": "#/$defs/nonEmpty"
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              "$ref": "#/$defs/nonEmpty"
            },
            {
              "$ref": "#/$defs/extensionObject"
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          ]
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              "$ref": "#/$defs/nonEmpty"
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