{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://soilgrower.com/schemas/openarbor-municipal-ordinance.schema.json",
  "title": "OpenArbor Municipal Tree Protection Ordinance Schema",
  "description": "Open JSON Schema for encoding municipal tree preservation ordinances, DBH protection tiers, species exceptions, seasonal oak wilt pruning restrictions, and mitigation fee/replacement schedules.",
  "type": "object",
  "required": [
    "id",
    "name",
    "state",
    "ordinance_numbers",
    "source_url",
    "dbh_threshold_inches"
  ],
  "properties": {
    "id": { "type": "string", "pattern": "^[a-z]{2}-[a-z0-9-]+$" },
    "name": { "type": "string" },
    "state": { "type": "string", "minLength": 2, "maxLength": 2 },
    "coordinates": {
      "type": "object",
      "required": ["lat", "lng"],
      "properties": {
        "lat": { "type": "number" },
        "lng": { "type": "number" }
      }
    },
    "ordinance_numbers": { "type": "string" },
    "source_url": { "type": "string", "format": "uri" },
    "dbh_threshold_inches": { "type": "number", "minimum": 0 },
    "heritage_threshold_inches": { "type": ["number", "null"], "minimum": 0 },
    "heritage_species_thresholds": {
      "type": "object",
      "additionalProperties": { "type": "number" }
    },
    "excepted_species": {
      "type": "array",
      "items": { "type": "string" }
    },
    "mitigation_fee_schedule": {
      "type": "object",
      "required": ["citation", "tiers"],
      "properties": {
        "citation": { "type": "string" },
        "exemption_pct": { "type": "number", "minimum": 0, "maximum": 100 },
        "exemption_citation": { "type": "string" },
        "heritage_rate_per_inch": { "type": "number" },
        "heritage_replacement_ratio": { "type": "number" },
        "penalty_civil_per_tree": { "type": "number" },
        "penalty_citation": { "type": "string" },
        "tiers": {
          "type": "array",
          "items": {
            "type": "object",
            "required": ["min_dbh", "rate_per_inch", "replacement_ratio"],
            "properties": {
              "min_dbh": { "type": "number" },
              "max_dbh": { "type": ["number", "null"] },
              "rate_per_inch": { "type": "number" },
              "replacement_ratio": { "type": "number" }
            }
          }
        }
      }
    },
    "plan_rules": {
      "type": "object",
      "properties": {
        "survey": {
          "type": "object",
          "properties": {
            "citation": { "type": "string" },
            "hardwood_min_dbh": { "type": "number" },
            "max_age_years": { "type": "number" },
            "multi_trunk": { "type": "string", "enum": ["largest_plus_half", "quadratic", "sum"] }
          }
        },
        "root_zone": {
          "type": "object",
          "properties": {
            "citation": { "type": "string" },
            "crz_ft_per_inch": { "type": "number" },
            "crz_min_ft": { "type": "number" },
            "removal_if_disturbed_pct": { "type": "number" },
            "cutfill_max_in": { "type": "number" },
            "impervious_max_pct": { "type": "number" },
            "crown_removal_max_pct": { "type": "number" }
          }
        },
        "pruning": {
          "type": "object",
          "properties": {
            "citation": { "type": "string" },
            "standard": { "type": "string" },
            "oak_months": {
              "type": "array",
              "items": { "type": "integer", "minimum": 1, "maximum": 12 }
            }
          }
        }
      }
    }
  }
}