{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://visualspec.dev/schema/1.0/modules/validation.schema.json",
  "title": "Validation",
  "description": "Structural, semantic, accessibility, visual and reference conformance expectations.",
  "$defs": {
    "tolerance": {
      "type": "object",
      "description": "Comparison thresholds; metric-specific interpretation is declared by the validator.",
      "properties": {
        "absolute": {
          "type": "number",
          "minimum": 0
        },
        "relative": {
          "type": "number",
          "minimum": 0,
          "maximum": 1
        },
        "unit": {
          "type": "string",
          "minLength": 1
        }
      },
      "additionalProperties": false
    },
    "rule": {
      "type": "object",
      "properties": {
        "id": {
          "$ref": "https://visualspec.dev/schema/1.0/modules/common.schema.json#/$defs/id"
        },
        "type": {
          "enum": [
            "schema",
            "semantic",
            "capability",
            "accessibility",
            "visual",
            "reference-conformance"
          ]
        },
        "targetRef": {
          "$ref": "https://visualspec.dev/schema/1.0/modules/common.schema.json#/$defs/id"
        },
        "referenceRef": {
          "$ref": "https://visualspec.dev/schema/1.0/modules/common.schema.json#/$defs/id"
        },
        "aspect": {
          "$ref": "https://visualspec.dev/schema/1.0/modules/common.schema.json#/$defs/taxonomy"
        },
        "metric": {
          "$ref": "https://visualspec.dev/schema/1.0/modules/common.schema.json#/$defs/taxonomy"
        },
        "matchMode": {
          "enum": [
            "exact",
            "structural",
            "perceptual",
            "semantic",
            "stylistic",
            "inspirational"
          ]
        },
        "conformance": {
          "enum": [
            "strict",
            "approximate",
            "inspiration"
          ]
        },
        "tolerance": {
          "$ref": "https://visualspec.dev/schema/1.0/modules/validation.schema.json#/$defs/tolerance"
        },
        "severity": {
          "enum": [
            "error",
            "warning",
            "info"
          ]
        },
        "required": {
          "type": "boolean"
        },
        "description": {
          "type": "string",
          "minLength": 1
        },
        "viewport": {
          "$ref": "https://visualspec.dev/schema/1.0/modules/common.schema.json#/$defs/viewport"
        },
        "stateRef": {
          "$ref": "https://visualspec.dev/schema/1.0/modules/common.schema.json#/$defs/id"
        },
        "time": {
          "$ref": "https://visualspec.dev/schema/1.0/modules/common.schema.json#/$defs/time"
        },
        "extensions": {
          "$ref": "https://visualspec.dev/schema/1.0/modules/common.schema.json#/$defs/extensions"
        }
      },
      "required": [
        "id",
        "type"
      ],
      "additionalProperties": false
    },
    "validation": {
      "type": "object",
      "properties": {
        "schema": {
          "type": "boolean"
        },
        "semantic": {
          "type": "boolean"
        },
        "accessibility": {
          "type": "boolean"
        },
        "capabilities": {
          "type": "boolean"
        },
        "rules": {
          "type": "array",
          "items": {
            "$ref": "https://visualspec.dev/schema/1.0/modules/validation.schema.json#/$defs/rule"
          }
        },
        "referenceConformance": {
          "type": "array",
          "items": {
            "type": "object",
            "properties": {
              "referenceRef": {
                "$ref": "https://visualspec.dev/schema/1.0/modules/common.schema.json#/$defs/id"
              },
              "aspect": {
                "$ref": "https://visualspec.dev/schema/1.0/modules/common.schema.json#/$defs/taxonomy"
              },
              "conformance": {
                "enum": [
                  "strict",
                  "approximate",
                  "inspiration"
                ]
              },
              "matchMode": {
                "enum": [
                  "exact",
                  "structural",
                  "perceptual",
                  "semantic",
                  "stylistic",
                  "inspirational"
                ]
              },
              "tolerance": {
                "$ref": "https://visualspec.dev/schema/1.0/modules/validation.schema.json#/$defs/tolerance"
              }
            },
            "required": [
              "referenceRef",
              "aspect",
              "conformance"
            ],
            "additionalProperties": false
          }
        },
        "failOn": {
          "enum": [
            "error",
            "warning",
            "info"
          ]
        },
        "extensions": {
          "$ref": "https://visualspec.dev/schema/1.0/modules/common.schema.json#/$defs/extensions"
        }
      },
      "additionalProperties": false
    }
  },
  "$ref": "#/$defs/validation"
}