{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://divejson.org/schema/1.0/divejson.schema.json",
  "title": "DiveJSON 1.0",
  "description": "A DiveJSON document: an open dive-log interchange format. This schema describes exactly the members version 1.0 defines; the normative specification is spec/divejson.md, and the requirements it lists as beyond-schema are checked by the reference validator, not here. Absence is the only spelling of \"not recorded\": no member accepts null.",
  "type": "object",
  "properties": {
    "format": { "const": "divejson" },
    "version": { "const": "1.0" },
    "exported_at": { "$ref": "#/$defs/offset_date_time" },
    "generator": { "$ref": "#/$defs/generator" },
    "diver": { "$ref": "#/$defs/diver" },
    "dives": { "type": "array", "items": { "$ref": "#/$defs/dive" } },
    "trips": { "type": "array", "items": { "$ref": "#/$defs/trip" } },
    "courses": { "type": "array", "items": { "$ref": "#/$defs/course" } },
    "sites": { "type": "array", "items": { "$ref": "#/$defs/dive_site" } },
    "species": { "type": "array", "items": { "$ref": "#/$defs/species" } },
    "gear": { "type": "array", "items": { "$ref": "#/$defs/gear_item" } },
    "gear_sets": { "type": "array", "items": { "$ref": "#/$defs/gear_set" } },
    "gear_service_schedules": { "type": "array", "items": { "$ref": "#/$defs/gear_service_schedule" } },
    "gear_service_records": { "type": "array", "items": { "$ref": "#/$defs/gear_service_record" } },
    "certifications": { "type": "array", "items": { "$ref": "#/$defs/certification" } },
    "contacts": { "type": "array", "items": { "$ref": "#/$defs/contact" } },
    "people": { "type": "array", "items": { "$ref": "#/$defs/person" } },
    "extensions": { "$ref": "#/$defs/extensions" }
  },
  "required": ["format", "version", "exported_at"],
  "additionalProperties": false,
  "$defs": {
    "uuid": {
      "type": "string",
      "format": "uuid",
      "pattern": "^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$"
    },
    "uuid_list": {
      "type": "array",
      "items": { "$ref": "#/$defs/uuid" },
      "uniqueItems": true
    },
    "date_time": {
      "type": "string",
      "pattern": "^[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}(\\.[0-9]+)?([Zz]|[+-][0-9]{2}:[0-9]{2})?$"
    },
    "offset_date_time": {
      "type": "string",
      "format": "date-time",
      "pattern": "^[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}(\\.[0-9]+)?([Zz]|[+-][0-9]{2}:[0-9]{2})$"
    },
    "date": {
      "type": "string",
      "format": "date",
      "pattern": "^[0-9]{4}-[0-9]{2}-[0-9]{2}$"
    },
    "notes": {
      "type": "string"
    },
    "tags": {
      "description": "The diver's labels for a dive or a dive site. uniqueItems rejects a tag written twice byte for byte; that no two tags are equal once trimmed and case-folded is a rule the validator checks, since two such tags are two different strings to uniqueItems.",
      "type": "array",
      "items": { "type": "string", "minLength": 1, "maxLength": 64 },
      "uniqueItems": true
    },
    "water_type": { "enum": ["salt", "fresh", "brackish"] },
    "entry_type": { "enum": ["shore", "boat", "pier", "pool"] },
    "extensions": {
      "type": "object",
      "propertyNames": { "pattern": "^[a-z0-9][a-z0-9._-]*$" }
    },
    "position": {
      "type": "object",
      "properties": {
        "latitude": { "type": "number", "minimum": -90, "maximum": 90 },
        "longitude": { "type": "number", "minimum": -180, "maximum": 180 },
        "extensions": { "$ref": "#/$defs/extensions" }
      },
      "required": ["latitude", "longitude"],
      "additionalProperties": false
    },
    "bounding_box": {
      "type": "object",
      "properties": {
        "south": { "type": "number", "minimum": -90, "maximum": 90 },
        "north": { "type": "number", "minimum": -90, "maximum": 90 },
        "west": { "type": "number", "minimum": -180, "maximum": 180 },
        "east": { "type": "number", "minimum": -180, "maximum": 180 },
        "extensions": { "$ref": "#/$defs/extensions" }
      },
      "required": ["south", "north", "west", "east"],
      "additionalProperties": false
    },
    "generator": {
      "type": "object",
      "properties": {
        "name": { "type": "string", "minLength": 1 },
        "version": { "type": "string" },
        "extensions": { "$ref": "#/$defs/extensions" }
      },
      "required": ["name"],
      "additionalProperties": false
    },
    "diver": {
      "type": "object",
      "properties": {
        "uuid": { "$ref": "#/$defs/uuid" },
        "name": { "type": "string", "maxLength": 255 },
        "email": { "type": "string", "format": "email", "maxLength": 255 },
        "phone": { "type": "string", "maxLength": 32 },
        "born_on": { "$ref": "#/$defs/date" },
        "emergency_contacts": { "type": "array", "items": { "$ref": "#/$defs/emergency_contact" } },
        "insurances": { "type": "array", "items": { "$ref": "#/$defs/insurance" } },
        "portrait_file": { "$ref": "#/$defs/stored_file" },
        "created_at": { "$ref": "#/$defs/date_time" },
        "extensions": { "$ref": "#/$defs/extensions" }
      },
      "additionalProperties": false
    },
    "emergency_contact": {
      "type": "object",
      "properties": {
        "name": { "type": "string", "minLength": 1, "maxLength": 255 },
        "phone": { "type": "string", "maxLength": 32 },
        "relationship": { "type": "string", "maxLength": 64 },
        "extensions": { "$ref": "#/$defs/extensions" }
      },
      "required": ["name"],
      "additionalProperties": false
    },
    "insurance": {
      "type": "object",
      "properties": {
        "provider": { "type": "string", "minLength": 1, "maxLength": 255 },
        "number": { "type": "string", "maxLength": 64 },
        "expires_on": { "$ref": "#/$defs/date" },
        "extensions": { "$ref": "#/$defs/extensions" }
      },
      "required": ["provider"],
      "additionalProperties": false
    },
    "dive": {
      "type": "object",
      "properties": {
        "uuid": { "$ref": "#/$defs/uuid" },
        "number": { "type": "integer" },
        "started_at": {
          "anyOf": [{ "$ref": "#/$defs/date_time" }, { "$ref": "#/$defs/date" }]
        },
        "submerged_time": { "type": "integer", "exclusiveMinimum": 0 },
        "notes": { "$ref": "#/$defs/notes" },
        "type": {
          "enum": ["open_circuit", "closed_circuit", "semi_closed", "freedive", "snorkel", "surface_supplied"]
        },
        "rating": { "type": "integer", "minimum": 1, "maximum": 5 },
        "tags": { "$ref": "#/$defs/tags" },
        "max_depth": { "type": "number", "exclusiveMinimum": 0 },
        "avg_depth": { "type": "number", "exclusiveMinimum": 0 },
        "bottom_temperature": { "type": "number" },
        "visibility": { "type": "number", "minimum": 0 },
        "weight": { "type": "number", "minimum": 0 },
        "water_type": { "$ref": "#/$defs/water_type" },
        "altitude": { "type": "integer", "minimum": -450, "maximum": 6500 },
        "air_temperature": { "type": "number" },
        "current": { "enum": ["none", "light", "moderate", "strong", "extreme"] },
        "waves": { "enum": ["calm", "slight", "moderate", "rough"] },
        "weather": { "enum": ["clear", "partly_cloudy", "overcast", "rain", "storm", "snow", "fog"] },
        "entry_type": { "$ref": "#/$defs/entry_type" },
        "boat_name": { "type": "string", "minLength": 1, "maxLength": 255 },
        "entry_position": { "$ref": "#/$defs/position" },
        "exit_position": { "$ref": "#/$defs/position" },
        "trip_uuid": { "$ref": "#/$defs/uuid" },
        "course_uuid": { "$ref": "#/$defs/uuid" },
        "contact_uuid": { "$ref": "#/$defs/uuid" },
        "site_uuids": { "$ref": "#/$defs/uuid_list" },
        "gear_uuids": { "$ref": "#/$defs/uuid_list" },
        "sightings": { "type": "array", "items": { "$ref": "#/$defs/sighting" } },
        "people": { "$ref": "#/$defs/people" },
        "cylinders": { "type": "array", "items": { "$ref": "#/$defs/cylinder" } },
        "recordings": { "type": "array", "items": { "$ref": "#/$defs/recording" } },
        "created_at": { "$ref": "#/$defs/date_time" },
        "extensions": { "$ref": "#/$defs/extensions" }
      },
      "required": ["uuid", "started_at"],
      "additionalProperties": false
    },
    "sighting": {
      "description": "One species seen on one dive. That a dive's sightings name a species at most once is a rule the validator checks: uniqueItems compares whole sightings, and two sightings of one species with different counts are two different objects to it.",
      "type": "object",
      "properties": {
        "species_uuid": { "$ref": "#/$defs/uuid" },
        "count": { "type": "integer", "exclusiveMinimum": 0 },
        "notes": { "$ref": "#/$defs/notes" },
        "extensions": { "$ref": "#/$defs/extensions" }
      },
      "required": ["species_uuid"],
      "additionalProperties": false
    },
    "cylinder": {
      "description": "One gas supply on one dive. That a dive's cylinders link a gear item at most once is a rule the validator checks: uniqueItems compares whole cylinders, and two cylinders linking one vessel with different pressures are two different objects to it.",
      "type": "object",
      "properties": {
        "volume": { "type": "number", "exclusiveMinimum": 0 },
        "start_pressure": { "type": "number", "exclusiveMinimum": 0, "maximum": 350 },
        "end_pressure": { "type": "number", "minimum": 0, "maximum": 350 },
        "oxygen": { "type": "number", "minimum": 0, "maximum": 100 },
        "helium": { "type": "number", "minimum": 0, "maximum": 100 },
        "ppo2_limit": { "type": "number", "minimum": 0.4, "maximum": 2.0 },
        "gas_number": { "type": "integer", "minimum": 0 },
        "role": { "enum": ["bottom", "deco", "diluent", "oxygen"] },
        "usage": { "enum": ["parallel", "staged"] },
        "gear_uuid": { "$ref": "#/$defs/uuid" },
        "extensions": { "$ref": "#/$defs/extensions" }
      },
      "additionalProperties": false
    },
    "recording": {
      "type": "object",
      "properties": {
        "device": { "$ref": "#/$defs/device" },
        "mode": { "enum": ["open_circuit", "closed_circuit", "semi_closed", "gauge", "freedive"] },
        "deco_model": { "$ref": "#/$defs/deco_model" },
        "salinity": { "enum": ["fresh", "en13319", "salt"] },
        "started_at": { "$ref": "#/$defs/date_time" },
        "surface_pressure": { "type": "number", "minimum": 0.4, "maximum": 1.2 },
        "cns_start": { "type": "number", "minimum": 0 },
        "cns_end": { "type": "number", "minimum": 0 },
        "otu_start": { "type": "number", "minimum": 0 },
        "otu_end": { "type": "number", "minimum": 0 },
        "source_files": { "type": "array", "items": { "$ref": "#/$defs/stored_file" } },
        "profile": { "$ref": "#/$defs/profile" },
        "extensions": { "$ref": "#/$defs/extensions" }
      },
      "additionalProperties": false
    },
    "deco_model": {
      "type": "object",
      "properties": {
        "algorithm": { "enum": ["buhlmann", "rgbm"] },
        "name": { "type": "string", "minLength": 1, "maxLength": 64 },
        "gf_low": { "type": "integer", "minimum": 0, "maximum": 100 },
        "gf_high": { "type": "integer", "minimum": 0, "maximum": 100 },
        "conservatism": { "type": "integer" },
        "extensions": { "$ref": "#/$defs/extensions" }
      },
      "minProperties": 1,
      "additionalProperties": false,
      "dependentRequired": { "gf_low": ["gf_high"], "gf_high": ["gf_low"] }
    },
    "device": {
      "type": "object",
      "properties": {
        "brand": { "type": "string", "minLength": 1, "maxLength": 64 },
        "model": { "type": "string", "minLength": 1, "maxLength": 64 },
        "serial": { "type": "string", "minLength": 1, "maxLength": 64 },
        "firmware": { "type": "string", "minLength": 1, "maxLength": 32 },
        "name": { "type": "string", "minLength": 1, "maxLength": 64 },
        "dive_number": { "type": "integer", "minimum": 0 },
        "extensions": { "$ref": "#/$defs/extensions" }
      },
      "additionalProperties": false
    },
    "profile": {
      "type": "object",
      "properties": {
        "duration": { "type": "integer", "minimum": 0 },
        "depth": { "$ref": "#/$defs/series" },
        "ceiling": { "$ref": "#/$defs/series" },
        "temperature": { "$ref": "#/$defs/series" },
        "pressures": { "type": "array", "items": { "$ref": "#/$defs/pressure_series" } },
        "ndl": { "$ref": "#/$defs/unsigned_series" },
        "tts": { "$ref": "#/$defs/unsigned_series" },
        "ppo2": { "$ref": "#/$defs/unsigned_series" },
        "cns": { "$ref": "#/$defs/unsigned_series" },
        "gradient_factor": { "$ref": "#/$defs/unsigned_series" },
        "surface_gradient_factor": { "$ref": "#/$defs/unsigned_series" },
        "events": { "type": "array", "items": { "$ref": "#/$defs/event" } },
        "extensions": { "$ref": "#/$defs/extensions" }
      },
      "required": ["duration"],
      "additionalProperties": false
    },
    "series": {
      "type": "object",
      "properties": {
        "times": { "type": "array", "items": { "type": "integer", "minimum": 0 } },
        "values": { "type": "array", "items": { "type": "integer" } },
        "extensions": { "$ref": "#/$defs/extensions" }
      },
      "required": ["times", "values"],
      "additionalProperties": false
    },
    "unsigned_series": {
      "description": "A Series whose quantity has no negative reading: no-decompression time, time to surface, ppO2, CNS and the gradient factors. Depth, ceiling and temperature keep the signed definition above. A negative here is a device's absent-marker, which §5.4 spells as absence.",
      "type": "object",
      "properties": {
        "times": { "type": "array", "items": { "type": "integer", "minimum": 0 } },
        "values": { "type": "array", "items": { "type": "integer", "minimum": 0 } },
        "extensions": { "$ref": "#/$defs/extensions" }
      },
      "required": ["times", "values"],
      "additionalProperties": false
    },
    "pressure_series": {
      "type": "object",
      "properties": {
        "times": { "type": "array", "items": { "type": "integer", "minimum": 0 } },
        "values": { "type": "array", "items": { "type": "integer" } },
        "gas_number": { "type": "integer", "minimum": 0 },
        "extensions": { "$ref": "#/$defs/extensions" }
      },
      "required": ["times", "values", "gas_number"],
      "additionalProperties": false
    },
    "event": {
      "type": "object",
      "properties": {
        "time": { "type": "integer", "minimum": 0 },
        "type": {
          "enum": [
            "gas_switch", "deep_stop", "safety_stop", "bookmark",
            "ascent_rate", "safety_stop_mandatory", "safety_stop_violation",
            "deep_stop_violation", "ceiling_violation", "ndl_reached",
            "ppo2_high", "pressure_low", "depth_alarm"
          ]
        },
        "gas_number": { "type": "integer", "minimum": 0 },
        "label": { "type": "string" },
        "extensions": { "$ref": "#/$defs/extensions" }
      },
      "required": ["time"],
      "additionalProperties": false,
      "if": {
        "not": { "required": ["type"] }
      },
      "then": {
        "required": ["label"],
        "properties": { "label": { "type": "string", "minLength": 1 } }
      }
    },
    "stored_file": {
      "type": "object",
      "properties": {
        "uuid": { "$ref": "#/$defs/uuid" },
        "original_filename": { "type": "string", "minLength": 1, "maxLength": 255 },
        "content_type": { "type": "string", "minLength": 1, "maxLength": 64 },
        "byte_size": { "type": "integer", "minimum": 0 },
        "sha256": { "type": "string", "pattern": "^[0-9a-f]{64}$" },
        "archive_path": { "type": "string", "minLength": 1 },
        "extensions": { "$ref": "#/$defs/extensions" }
      },
      "required": ["uuid", "original_filename", "content_type", "byte_size", "sha256"],
      "additionalProperties": false
    },
    "trip": {
      "type": "object",
      "properties": {
        "uuid": { "$ref": "#/$defs/uuid" },
        "name": { "type": "string", "minLength": 1, "maxLength": 255 },
        "parts": { "type": "array", "items": { "$ref": "#/$defs/trip_part" } },
        "people": { "$ref": "#/$defs/people" },
        "notes": { "$ref": "#/$defs/notes" },
        "created_at": { "$ref": "#/$defs/date_time" },
        "extensions": { "$ref": "#/$defs/extensions" }
      },
      "required": ["uuid", "name"],
      "additionalProperties": false
    },
    "trip_part": {
      "type": "object",
      "properties": {
        "starts_on": { "$ref": "#/$defs/date" },
        "ends_on": { "$ref": "#/$defs/date" },
        "location": { "$ref": "#/$defs/location" },
        "accommodation_uuid": { "$ref": "#/$defs/uuid" },
        "extensions": { "$ref": "#/$defs/extensions" }
      },
      "additionalProperties": false
    },
    "location": {
      "type": "object",
      "properties": {
        "name": { "type": "string", "minLength": 1, "maxLength": 255 },
        "position": { "$ref": "#/$defs/position" },
        "bbox": { "$ref": "#/$defs/bounding_box" },
        "extensions": { "$ref": "#/$defs/extensions" }
      },
      "required": ["name"],
      "additionalProperties": false,
      "dependentRequired": { "bbox": ["position"] }
    },
    "address": {
      "type": "object",
      "properties": {
        "street": { "type": "string", "maxLength": 255 },
        "city": { "type": "string", "maxLength": 255 },
        "postcode": { "type": "string", "maxLength": 32 },
        "region": { "type": "string", "maxLength": 255 },
        "country": { "type": "string", "minLength": 1, "maxLength": 255 },
        "extensions": { "$ref": "#/$defs/extensions" }
      },
      "required": ["country"],
      "additionalProperties": false
    },
    "course": {
      "type": "object",
      "properties": {
        "uuid": { "$ref": "#/$defs/uuid" },
        "name": { "type": "string", "minLength": 1, "maxLength": 255 },
        "agency": {
          "enum": [
            "padi", "ssi", "naui", "sdi", "tdi", "cmas", "raid", "bsac",
            "gue", "iantd", "psai", "dan", "efr", "andi", "snsi", "acuc",
            "pss", "ida", "ndl", "utd", "saa", "scotsac", "iac", "protec",
            "pdic", "nase", "sei", "ymca", "erdi", "aida", "molchanovs", "pfi",
            "apnea_academy", "fii", "nss_cds", "nacd", "idea", "diwa", "other"
          ]
        },
        "agency_other": { "type": "string", "minLength": 1, "maxLength": 64 },
        "status": {
          "enum": ["planned", "in_progress", "completed", "incomplete", "provisional", "not_passed"]
        },
        "starts_on": { "$ref": "#/$defs/date" },
        "ends_on": { "$ref": "#/$defs/date" },
        "instructor_number": { "type": "string", "maxLength": 64 },
        "contact_uuid": { "$ref": "#/$defs/uuid" },
        "people": { "$ref": "#/$defs/people" },
        "notes": { "$ref": "#/$defs/notes" },
        "created_at": { "$ref": "#/$defs/date_time" },
        "extensions": { "$ref": "#/$defs/extensions" }
      },
      "required": ["uuid", "name"],
      "additionalProperties": false,
      "if": {
        "properties": { "agency": { "const": "other" } },
        "required": ["agency"]
      },
      "then": {
        "required": ["agency_other"]
      },
      "else": {
        "not": { "required": ["agency_other"] }
      }
    },
    "dive_site": {
      "type": "object",
      "properties": {
        "uuid": { "$ref": "#/$defs/uuid" },
        "name": { "type": "string", "minLength": 1, "maxLength": 255 },
        "other_names": {
          "description": "Other names the site goes by, in the diver's own order. uniqueItems rejects a name written twice byte for byte; that none repeats another or the site's name once trimmed and case-folded is a rule the validator checks.",
          "type": "array",
          "items": { "type": "string", "minLength": 1, "maxLength": 255 },
          "uniqueItems": true
        },
        "location": { "$ref": "#/$defs/location" },
        "position": { "$ref": "#/$defs/position" },
        "external_ids": {
          "description": "The place's entries in registries outside the logbook. uniqueItems rejects an entry written twice whole; that no two name the same registry and identifier is a rule the validator checks, since two such entries are two different objects to uniqueItems whenever anything beside the pair differs.",
          "type": "array",
          "items": { "$ref": "#/$defs/external_id" },
          "uniqueItems": true
        },
        "depth_from": { "type": "number", "minimum": 0 },
        "depth_to": { "type": "number", "minimum": 0 },
        "water_type": { "$ref": "#/$defs/water_type" },
        "altitude": { "type": "integer", "minimum": -450, "maximum": 6500 },
        "entry_types": {
          "type": "array",
          "items": { "$ref": "#/$defs/entry_type" },
          "uniqueItems": true
        },
        "tags": { "$ref": "#/$defs/tags" },
        "notes": { "$ref": "#/$defs/notes" },
        "created_at": { "$ref": "#/$defs/date_time" },
        "extensions": { "$ref": "#/$defs/extensions" }
      },
      "required": ["uuid", "name"],
      "additionalProperties": false
    },
    "external_id": {
      "description": "One entry of a dive site in a registry outside the logbook. A registry this version names holds its identifier to that registry's form; any other is carried as written.",
      "type": "object",
      "properties": {
        "registry": { "type": "string", "pattern": "^[a-z0-9][a-z0-9._-]*$" },
        "identifier": { "type": "string", "minLength": 1, "maxLength": 255 },
        "extensions": { "$ref": "#/$defs/extensions" }
      },
      "required": ["registry", "identifier"],
      "additionalProperties": false,
      "allOf": [
        {
          "if": {
            "properties": { "registry": { "const": "wikidata" } },
            "required": ["registry"]
          },
          "then": {
            "properties": { "identifier": { "pattern": "^Q[1-9][0-9]*$" } }
          }
        },
        {
          "if": {
            "properties": { "registry": { "const": "openstreetmap" } },
            "required": ["registry"]
          },
          "then": {
            "properties": { "identifier": { "pattern": "^(node|way|relation)/[1-9][0-9]*$" } }
          }
        }
      ]
    },
    "species": {
      "type": "object",
      "properties": {
        "uuid": { "$ref": "#/$defs/uuid" },
        "aphia_id": { "type": "integer", "exclusiveMinimum": 0 },
        "scientific_name": { "type": "string", "minLength": 1, "maxLength": 255 },
        "common_name": { "type": "string", "minLength": 1, "maxLength": 255 },
        "rank": { "type": "string", "maxLength": 64 },
        "wikidata_qid": { "type": "string", "minLength": 1, "maxLength": 32 },
        "created_at": { "$ref": "#/$defs/date_time" },
        "extensions": { "$ref": "#/$defs/extensions" }
      },
      "required": ["uuid"],
      "additionalProperties": false,
      "anyOf": [
        { "required": ["aphia_id"] },
        { "required": ["scientific_name"] },
        { "required": ["common_name"] },
        { "required": ["wikidata_qid"] }
      ]
    },
    "gear_item": {
      "type": "object",
      "properties": {
        "uuid": { "$ref": "#/$defs/uuid" },
        "name": { "type": "string", "minLength": 1, "maxLength": 255 },
        "brand": { "type": "string", "maxLength": 255 },
        "serial": { "type": "string", "minLength": 1, "maxLength": 64 },
        "type": {
          "enum": [
            "mask", "snorkel", "fins", "wetsuit", "drysuit", "vest", "hood",
            "gloves", "boots", "bcd", "regulator", "rebreather", "computer",
            "transmitter", "cylinder", "light", "scooter", "smb", "mirror",
            "whistle", "reel", "knife", "line_cutter", "shears", "compass",
            "camera", "other"
          ]
        },
        "volume": { "type": "number", "exclusiveMinimum": 0 },
        "working_pressure": { "type": "number", "exclusiveMinimum": 0, "maximum": 350 },
        "material": { "enum": ["steel", "aluminium", "carbon"] },
        "notes": { "$ref": "#/$defs/notes" },
        "rented": { "type": "boolean" },
        "archived": { "type": "boolean" },
        "archived_at": { "$ref": "#/$defs/date_time" },
        "dive_count": { "type": "integer", "minimum": 0 },
        "dive_time": { "type": "integer", "minimum": 0 },
        "created_at": { "$ref": "#/$defs/date_time" },
        "extensions": { "$ref": "#/$defs/extensions" }
      },
      "required": ["uuid", "name"],
      "additionalProperties": false
    },
    "gear_set": {
      "type": "object",
      "properties": {
        "uuid": { "$ref": "#/$defs/uuid" },
        "name": { "type": "string", "minLength": 1, "maxLength": 255 },
        "weight": { "type": "number", "minimum": 0 },
        "gear_uuids": { "$ref": "#/$defs/uuid_list" },
        "created_at": { "$ref": "#/$defs/date_time" },
        "extensions": { "$ref": "#/$defs/extensions" }
      },
      "required": ["uuid", "name"],
      "additionalProperties": false
    },
    "service_type": {
      "enum": ["service", "visual_inspection", "hydrostatic_test", "battery", "oxygen_clean", "other"]
    },
    "gear_service_schedule": {
      "type": "object",
      "properties": {
        "uuid": { "$ref": "#/$defs/uuid" },
        "gear_uuid": { "$ref": "#/$defs/uuid" },
        "type": { "$ref": "#/$defs/service_type" },
        "label": { "type": "string", "maxLength": 120 },
        "starts_on": { "$ref": "#/$defs/date" },
        "interval_months": { "type": "integer", "exclusiveMinimum": 0 },
        "interval_dives": { "type": "integer", "exclusiveMinimum": 0 },
        "interval_hours": { "type": "integer", "exclusiveMinimum": 0 },
        "dive_count_at_start": { "type": "integer", "minimum": 0 },
        "dive_time_at_start": { "type": "integer", "minimum": 0 },
        "active": { "type": "boolean" },
        "last_service_on": { "$ref": "#/$defs/date" },
        "next_due_on": { "$ref": "#/$defs/date" },
        "next_due_at_dive_count": { "type": "integer", "minimum": 0 },
        "next_due_at_dive_time": { "type": "integer", "minimum": 0 },
        "created_at": { "$ref": "#/$defs/date_time" },
        "extensions": { "$ref": "#/$defs/extensions" }
      },
      "required": ["uuid", "gear_uuid", "type", "starts_on"],
      "additionalProperties": false,
      "anyOf": [
        { "required": ["interval_months"] },
        { "required": ["interval_dives"] },
        { "required": ["interval_hours"] }
      ]
    },
    "gear_service_record": {
      "type": "object",
      "properties": {
        "uuid": { "$ref": "#/$defs/uuid" },
        "gear_uuid": { "$ref": "#/$defs/uuid" },
        "gear_service_schedule_uuid": { "$ref": "#/$defs/uuid" },
        "type": { "$ref": "#/$defs/service_type" },
        "serviced_on": { "$ref": "#/$defs/date" },
        "dive_count_at_service": { "type": "integer", "minimum": 0 },
        "dive_time_at_service": { "type": "integer", "minimum": 0 },
        "label": { "type": "string", "maxLength": 120 },
        "performed_by": { "type": "string", "maxLength": 255 },
        "contact_uuid": { "$ref": "#/$defs/uuid" },
        "notes": { "$ref": "#/$defs/notes" },
        "created_at": { "$ref": "#/$defs/date_time" },
        "extensions": { "$ref": "#/$defs/extensions" }
      },
      "required": ["uuid", "gear_uuid", "type", "serviced_on"],
      "additionalProperties": false
    },
    "certification": {
      "type": "object",
      "properties": {
        "uuid": { "$ref": "#/$defs/uuid" },
        "agency": {
          "enum": [
            "padi", "ssi", "naui", "sdi", "tdi", "cmas", "raid", "bsac",
            "gue", "iantd", "psai", "dan", "efr", "andi", "snsi", "acuc",
            "pss", "ida", "ndl", "utd", "saa", "scotsac", "iac", "protec",
            "pdic", "nase", "sei", "ymca", "erdi", "aida", "molchanovs", "pfi",
            "apnea_academy", "fii", "nss_cds", "nacd", "idea", "diwa", "other"
          ]
        },
        "agency_other": { "type": "string", "minLength": 1, "maxLength": 64 },
        "name": { "type": "string", "minLength": 1, "maxLength": 255 },
        "number": { "type": "string", "maxLength": 64 },
        "certified_on": { "$ref": "#/$defs/date" },
        "expires_on": { "$ref": "#/$defs/date" },
        "instructor_uuid": { "$ref": "#/$defs/uuid" },
        "instructor_number": { "type": "string", "maxLength": 64 },
        "contact_uuid": { "$ref": "#/$defs/uuid" },
        "course_uuid": { "$ref": "#/$defs/uuid" },
        "notes": { "$ref": "#/$defs/notes" },
        "front_file": { "$ref": "#/$defs/stored_file" },
        "back_file": { "$ref": "#/$defs/stored_file" },
        "created_at": { "$ref": "#/$defs/date_time" },
        "extensions": { "$ref": "#/$defs/extensions" }
      },
      "required": ["uuid", "agency", "name"],
      "additionalProperties": false,
      "if": {
        "properties": { "agency": { "const": "other" } },
        "required": ["agency"]
      },
      "then": {
        "required": ["agency_other"]
      },
      "else": {
        "not": { "required": ["agency_other"] }
      }
    },
    "contact": {
      "type": "object",
      "properties": {
        "uuid": { "$ref": "#/$defs/uuid" },
        "name": { "type": "string", "minLength": 1, "maxLength": 255 },
        "roles": {
          "type": "array",
          "items": {
            "enum": ["dive_center", "school", "shop", "accommodation", "liveaboard", "club", "other"]
          },
          "uniqueItems": true
        },
        "phone": { "type": "string", "maxLength": 32 },
        "email": { "type": "string", "format": "email", "maxLength": 255 },
        "website": { "type": "string", "format": "uri", "maxLength": 512 },
        "address": { "$ref": "#/$defs/address" },
        "notes": { "$ref": "#/$defs/notes" },
        "created_at": { "$ref": "#/$defs/date_time" },
        "extensions": { "$ref": "#/$defs/extensions" }
      },
      "required": ["uuid", "name"],
      "additionalProperties": false
    },
    "person": {
      "type": "object",
      "properties": {
        "uuid": { "$ref": "#/$defs/uuid" },
        "name": { "type": "string", "minLength": 1, "maxLength": 255 },
        "email": { "type": "string", "format": "email", "maxLength": 255 },
        "phone": { "type": "string", "maxLength": 32 },
        "notes": { "$ref": "#/$defs/notes" },
        "created_at": { "$ref": "#/$defs/date_time" },
        "extensions": { "$ref": "#/$defs/extensions" }
      },
      "required": ["uuid", "name"],
      "additionalProperties": false
    },
    "people": {
      "description": "A host's references to people, in the diver's own order. That no person appears twice is a rule the validator checks: uniqueItems compares whole references, and two references to one person under two roles are two different objects to it.",
      "type": "array",
      "items": { "$ref": "#/$defs/person_reference" }
    },
    "person_reference": {
      "type": "object",
      "properties": {
        "person_uuid": { "$ref": "#/$defs/uuid" },
        "role": { "enum": ["buddy", "guide", "instructor", "student", "companion"] },
        "extensions": { "$ref": "#/$defs/extensions" }
      },
      "required": ["person_uuid"],
      "additionalProperties": false
    }
  }
}