{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "gno://schemas/section-target@1.0",
  "title": "GNO Section Target V1",
  "description": "Bounded, versioned, content-derived section locator for conservative citation recovery. Does not embed full section bodies.",
  "type": "object",
  "additionalProperties": false,
  "required": [
    "schemaVersion",
    "document",
    "anchor",
    "headingPath",
    "occurrence",
    "quote",
    "sourceFingerprint",
    "hints"
  ],
  "properties": {
    "schemaVersion": {
      "const": "1",
      "description": "Section target schema version"
    },
    "document": {
      "type": "object",
      "additionalProperties": false,
      "required": ["uri"],
      "properties": {
        "uri": {
          "type": "string",
          "minLength": 1,
          "maxLength": 1024,
          "description": "Canonical document URI"
        }
      }
    },
    "anchor": {
      "type": "string",
      "minLength": 1,
      "maxLength": 512,
      "description": "Human-readable heading anchor at capture time"
    },
    "headingPath": {
      "type": "array",
      "description": "NFC-normalized heading ancestry including the section title",
      "minItems": 1,
      "maxItems": 6,
      "items": {
        "type": "string",
        "minLength": 1,
        "maxLength": 512
      }
    },
    "occurrence": {
      "type": "integer",
      "minimum": 1,
      "maximum": 9007199254740991,
      "description": "1-based occurrence among sections with the same headingPath"
    },
    "quote": {
      "type": "object",
      "additionalProperties": false,
      "required": ["exact", "prefix", "suffix"],
      "properties": {
        "exact": {
          "type": "string",
          "maxLength": 96,
          "description": "Bounded exact quote (section body preferred, else heading title)"
        },
        "prefix": {
          "type": "string",
          "maxLength": 32,
          "description": "Bounded prefix context immediately before exact"
        },
        "suffix": {
          "type": "string",
          "maxLength": 32,
          "description": "Bounded suffix context immediately after exact"
        }
      }
    },
    "sourceFingerprint": {
      "$ref": "#/definitions/sha256",
      "description": "SHA-256 hex fingerprint of the full source document content at capture"
    },
    "hints": {
      "type": "object",
      "additionalProperties": false,
      "required": ["line", "startOffset", "endOffset"],
      "description": "Line and code-unit offset hints only; never identity",
      "properties": {
        "line": {
          "type": "integer",
          "minimum": 1,
          "maximum": 9007199254740991,
          "description": "1-based heading line at capture"
        },
        "startOffset": {
          "type": "integer",
          "minimum": 0,
          "maximum": 9007199254740991,
          "description": "UTF-16 code-unit start offset of the exact quote at capture"
        },
        "endOffset": {
          "type": "integer",
          "minimum": 0,
          "maximum": 9007199254740991,
          "description": "UTF-16 code-unit end offset of the exact quote at capture"
        }
      }
    }
  },
  "definitions": {
    "sha256": {
      "type": "string",
      "pattern": "^[a-f0-9]{64}$"
    }
  }
}