--- $schema: "http://json-schema.org/draft-07/schema#" $id: "https://oimlsmart.org/schemas/R31.yaml" title: "OIML R31 (Diaphragm gas meters) Certificate Schema" description: | Schema for OIML R31:1995 diaphragm gas meters. The Recommendation defines accuracy classes 0.5/1/1.5/2 in the standard text; only class '1.5' appears in the dataset, and only on CN1 (China) certificates. FR2/NL1/RU1 issuers leave the array empty (the class is implied by the Qmin/Qmax ratio). Edition 1995. Categories: "Diaphragm gas meter", "Gas meter" — both forms appear in the data and refer to the same instrument type. The schema admits both pending canonicalization. type: object required: [certificate, certified_type, characteristics, recommendation] properties: certificate: { $ref: "_core.yaml#/definitions/Certificate" } issuing_authority: { $ref: "_core.yaml#/definitions/IssuingAuthority" } applicants: { $ref: "_core.yaml#/definitions/PartyList" } manufacturers: description: | Manufacturer parties. 12/39 R31 certs (all CN1) leave this empty. The `_core.yaml` PartyList requires minItems: 1; this local override permits an empty list for R31. type: array items: { $ref: "_core.yaml#/definitions/Party" } certified_type: { $ref: "#/definitions/CertifiedType" } characteristics: { $ref: "#/definitions/Characteristics" } recommendation: type: object required: [id, edition, scheme] properties: id: { type: string, const: R31 } edition: { type: integer, const: 1995 } amendment: { type: [integer, string, "null"] } scheme: { type: string, enum: [A, B] } accuracy_classes: description: | OIML R31:1995 accuracy classes. Only '1.5' appears in the dataset; 27/39 certs leave this empty (the class is implied by Qmin/Qmax). type: array items: { $ref: "#/definitions/AccuracyClassValue" } test_reports: { $ref: "_core.yaml#/definitions/TestReportList" } revision_history: { $ref: "_core.yaml#/definitions/RevisionHistory" } model_family: { $ref: "_core.yaml#/definitions/ModelFamily" } components: type: array items: { $ref: "_core.yaml#/definitions/Component" } footnotes: { $ref: "_core.yaml#/definitions/FootnoteList" } d011_tests_applicable: description: | Tests mandated by R31:1995 type evaluation (D 11:2013 subset). R31 is a 1995 Recommendation predating the modern D 11:2013 climatic test suite; the default list reflects the electronic-instrument tests typically applied during type evaluation of gas meters. type: array items: { $ref: "#/definitions/D011TestReference" } default: - { test_id: d011_t06_static_temperature } - { test_id: d011_t07_static_temperature } - { test_id: d011_t11_atmospheric_pressure } - { test_id: d011_t18_dc_mains_voltage_variation } - { test_id: d011_t20_ac_mains_voltage_variation } - { test_id: d011_t22_dc_mains_dips_interruptions } - { test_id: d011_t23_ac_mains_dips_interruptions } - { test_id: d011_t26_bursts_ac_dc_mains } - { test_id: d011_t27_surges_ac_dc_mains } - { test_id: d011_t28_bursts_signal_data_control } - { test_id: d011_t33_rf_em_fields_general } - { test_id: d011_t35_electrostatic_discharges } definitions: AccuracyClassValue: description: | OIML R31:1995 §3.2 accuracy class token. The Recommendation uses decimal classes (0.5/1/1.5/2). Only '1.5' is observed in the dataset. type: string oneOf: - const: "0.5" description: Class 0.5 — highest precision diaphragm gas meter - const: "1" description: Class 1 — high precision - const: "1.5" description: Class 1.5 — medium precision (the only class observed in the dataset) - const: "2" description: Class 2 — coarse precision AccuracyClass: description: | StructuredValue-wrapped accuracy class token. Used at type_level when an issuer records the class against the characteristic; mirrors `recommendation.accuracy_classes`. Note: ~8 R31 CN1 certs attach `unit_symbol: "%"` to this value, which is semantically incorrect — the class is a designation, not a percentage. The schema permits any unit_symbol; a normalization pass is needed. allOf: - $ref: "_core.yaml#/definitions/StructuredValue" - properties: value: { $ref: "#/definitions/AccuracyClassValue" } DisplayType: description: | R31:1995 §3 meter display technology. The dataset records "mechanical" for traditional drum/dial indicators; some electronic variants exist. French-language data uses "mécanique". The schema accepts both canonical and observed tokens plus free-form strings pending canonicalization. allOf: - $ref: "_core.yaml#/definitions/StructuredValue" - properties: value: type: [string, "null"] enum: [mechanical, "mécanique", electromechanical, electronic, null] BooleanFlag: description: | R31:1995 optional-feature flags. Issuers record these in mixed languages: "oui"/"non" (French), "yes"/"no" (English), "true"/"false", or a numeric pulse count when the feature is present with a configurable rate. The schema admits any of these forms pending boolean normalization. allOf: - $ref: "_core.yaml#/definitions/StructuredValue" - properties: value: oneOf: - type: [string, "null"] - type: [number, "null"] CertifiedType: type: object required: [category, type_designations] properties: category: description: | OIML R31:1995 instrument category. Two forms appear in the dataset: "Diaphragm gas meter" (18/39, mostly FR2/NL1) and "Gas meter" (21/39, mostly CN1/older NL1). Both refer to the same instrument type; pending normalization to "Diaphragm gas meter". type: string enum: - Diaphragm gas meter - Gas meter type_designations: type: array items: { type: string } module_designation: description: | R31 meters are not classified by an instrument module; the dataset always records "N/A" or null here. type: [string, "null"] enum: ["N/A", "Not applicable", null] description: { type: [string, "null"] } Characteristics: type: object properties: type_level: { $ref: "#/definitions/TypeLevel" } model_level: type: array items: { $ref: "#/definitions/ModelLevelEntry" } config_level: type: array items: { $ref: "#/definitions/ConfigLevelEntry" } TypeLevel: description: | R31:1995 type-level characteristics. The dataset has heavy label variation (max_flow vs maximum_flow_rate vs maximum_capacity — all the same concept). The schema documents the canonical names and accepts legacy issuer-specific labels via `additionalProperties: true`. type: object properties: accuracy_class: { $ref: "#/definitions/AccuracyClass" } temperature_range: { $ref: "_modules/d011_environmental.yaml#/definitions/TemperatureRange" } humidity_class: { $ref: "_core.yaml#/definitions/StructuredValue" } electromagnetic_environment_class: { $ref: "_modules/d011_environmental.yaml#/definitions/EMClass" } mechanical_environment_class: { $ref: "_modules/d011_environmental.yaml#/definitions/MechanicalClass" } # Flow rates (canonical + observed synonyms) maximum_flow_rate: { $ref: "_core.yaml#/definitions/StructuredValue" } maximum_flow: { $ref: "_core.yaml#/definitions/StructuredValue" } maximum_capacity: { $ref: "_core.yaml#/definitions/StructuredValue" } minimum_flow_rate: { $ref: "_core.yaml#/definitions/StructuredValue" } minimum_flow: { $ref: "_core.yaml#/definitions/StructuredValue" } minimum_capacity: { $ref: "_core.yaml#/definitions/StructuredValue" } # Pressure (canonical + observed synonyms) maximum_operating_pressure: { $ref: "_core.yaml#/definitions/StructuredValue" } maximum_pressure: { $ref: "_core.yaml#/definitions/StructuredValue" } maximum_use_pressure: { $ref: "_core.yaml#/definitions/StructuredValue" } # Cyclic volume (canonical + observed synonyms) cyclic_volume: { $ref: "_core.yaml#/definitions/StructuredValue" } v: { $ref: "_core.yaml#/definitions/StructuredValue" } volume_v: { $ref: "_core.yaml#/definitions/StructuredValue" } # Display / indicator display_type: { $ref: "#/definitions/DisplayType" } type_of_display: { $ref: "#/definitions/DisplayType" } number_of_drums_digits: { $ref: "_core.yaml#/definitions/StructuredValue" } number_of_dials_digits: { $ref: "_core.yaml#/definitions/StructuredValue" } # Output pulse_generator: { $ref: "#/definitions/BooleanFlag" } pulse_generator_rate: { $ref: "_core.yaml#/definitions/StructuredValue" } pulse_frequency: { $ref: "_core.yaml#/definitions/StructuredValue" } number_of_output_axes: { $ref: "_core.yaml#/definitions/StructuredValue" } # Optional features prepayment_device: { $ref: "#/definitions/BooleanFlag" } integrated_temperature_conversion: { $ref: "#/definitions/BooleanFlag" } integrated_temperature_conversion_device: { $ref: "#/definitions/BooleanFlag" } additionalProperties: true ModelLevelEntry: type: object required: [attribute, values] properties: attribute: { type: string } unit: { $ref: "_units.yaml#/definitions/Unit" } unit_symbol: { type: [string, "null"] } values: type: array items: type: object required: [model, value] properties: model: { type: string } value: { $ref: "_core.yaml#/definitions/ValueOrScalar" } footnote_markers: type: array items: { type: string } ConfigLevelEntry: type: object required: [attribute, axis, values] properties: attribute: { type: string } axis: { oneOf: [ { type: string }, { type: "null" } ] } unit: { $ref: "_units.yaml#/definitions/Unit" } unit_symbol: { type: [string, "null"] } values: type: array items: type: object required: [condition, value] properties: condition: { type: string } value: { $ref: "_core.yaml#/definitions/ValueOrScalar" } D011TestReference: description: Reference to an OIML D 11:2013 performance test. type: object required: [test_id] properties: test_id: { type: string, pattern: '^d011_t\d{2}_' } test_level_index: { type: integer, minimum: 1, maximum: 5 } notes: { type: string } allOf: - description: | D 11 damp heat tests (§9.2) apply iff the meter is installed in a humidity class that warrants them. For R31 the humidity_class field is free-form text rather than a D 11 H-class enum, so this rule applies only when an issuer records a D 11 H-class explicitly. if: properties: characteristics: properties: type_level: properties: humidity_class: properties: value: { const: H2 } then: properties: d011_tests_applicable: contains: properties: test_id: { const: d011_t08_damp_heat_steady_state }