{
  "$schema": "https://oo-ld.org/latest/meta/oold-meta-schema.json",
  "$id": "Composition.schema.json",
  "x-oold-version": "0.1.0",
  "title": "Composition",
  "description": "A material and its chemical composition: one entry per constituent, with the amount as a typed quantity. Terms in this schema's own IRI space are placeholders for a vocabulary that is not agreed yet, not a third ontology: they carry no axioms, and each records what it means in EMMO and in PMDco.",
  "examples": [
    {
      "type": [
        "Material"
      ],
      "composition": {
        "type": [
          "ChemicalComposition"
        ],
        "components": [
          {
            "type": [
              "Component"
            ],
            "constituent": "Fe",
            "amount": {
              "type": [
                "MassFraction"
              ],
              "value": 96.7,
              "unit": "percent"
            }
          }
        ]
      }
    }
  ],
  "type": "object",
  "properties": {
    "type": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "default": [
        "Material"
      ]
    },
    "composition": {
      "$ref": "#/$defs/ChemicalComposition"
    }
  },
  "required": [
    "composition"
  ],
  "$defs": {
    "ChemicalComposition": {
      "type": "object",
      "title": "ChemicalComposition",
      "description": "The constituents of a material and how much of each.",
      "properties": {
        "type": {
          "type": "array",
          "items": {
            "type": "string"
          },
          "default": [
            "ChemicalComposition"
          ]
        },
        "components": {
          "type": "array",
          "minItems": 1,
          "items": {
            "$ref": "#/$defs/Component"
          }
        }
      },
      "required": [
        "components"
      ]
    },
    "Component": {
      "type": "object",
      "title": "Component",
      "description": "One constituent and its amount.",
      "properties": {
        "type": {
          "type": "array",
          "items": {
            "type": "string"
          },
          "default": [
            "Component"
          ]
        },
        "constituent": {
          "type": "string",
          "description": "The chemical species or compound this component is made of",
          "examples": [
            "Fe",
            "Si",
            "C"
          ]
        },
        "amount": {
          "type": "object",
          "title": "MassFraction",
          "description": "Mirrors quantities/MassFraction until a cross-module $ref resolves; the quantity, not the unit, says the percentage is by mass",
          "properties": {
            "type": {
              "type": "array",
              "items": {
                "type": "string"
              },
              "default": [
                "MassFraction"
              ]
            },
            "value": {
              "type": "number"
            },
            "unit": {
              "enum": [
                "percent",
                "part_per_million"
              ],
              "default": "percent"
            },
            "standard_uncertainty": {
              "type": "number",
              "description": "Standard uncertainty, expressed in the unit of value (GUM convention)"
            }
          },
          "required": [
            "type",
            "value",
            "unit"
          ]
        }
      },
      "required": [
        "type",
        "constituent",
        "amount"
      ]
    }
  },
  "@context": {
    "@version": 1.1,
    "emmo": "https://w3id.org/emmo#",
    "obo": "http://purl.obolibrary.org/obo/",
    "pmd": "https://w3id.org/pmd/co/",
    "schema": "http://schema.org/",
    "self": {
      "@id": "https://w3id.org/oo-ld/schemas/materials/0.1/Composition.schema.json#",
      "@prefix": true
    },
    "id": "@id",
    "type": {
      "@id": "@type",
      "@container": "@set"
    },
    "Material": "https://w3id.org/oo-ld/schemas/materials/0.1/Composition.schema.json",
    "ChemicalComposition": "self:/$defs/ChemicalComposition",
    "Component": "self:/$defs/Component",
    "Fe": "emmo:EMMO_71b5082d-9908-5011-8ad0-b2ab70ffd08c",
    "Si": "emmo:EMMO_4f9670f5-14ca-53da-a1ea-9b0550a61035",
    "C": "emmo:EMMO_a7180b5f-d46d-5751-b3bc-ae28a6655992",
    "composition": {
      "@id": "self:/properties/composition",
      "@type": "@id"
    },
    "components": {
      "@id": "self:/$defs/ChemicalComposition/properties/components",
      "@type": "@id",
      "@container": "@set"
    },
    "constituent": {
      "@id": "self:/$defs/Component/properties/constituent",
      "@type": "@vocab"
    },
    "amount": {
      "@id": "self:/$defs/Component/properties/amount",
      "@type": "@id"
    },
    "qudt": "http://qudt.org/schema/qudt/",
    "qunit": "http://qudt.org/vocab/unit/",
    "value": "qudt:value",
    "unit": {
      "@id": "qudt:hasUnit",
      "@type": "@vocab"
    },
    "standard_uncertainty": "qudt:standardUncertainty",
    "qkind": "http://qudt.org/vocab/quantitykind/",
    "MassFraction": "qkind:MassFraction",
    "percent": "qunit:PERCENT",
    "part_per_million": "qunit:PPM"
  },
  "x-oold-context": {
    "Material": {
      "emmo:EMMO_bc37743c_37c4_4ec7_9d58_d1aae5567352": {
        "x-oold-sssom": {
          "predicate_id": "skos:exactMatch",
          "mapping_set_id": "https://w3id.org/oo-ld/schemas/mappings/emmo.sssom.tsv",
          "object_source_version": "https://w3id.org/emmo/1.0.4",
          "comment": "Substance, not Material: Material is ordinary matter with bonds, so it excludes gases and solutions"
        }
      },
      "pmd:PMD_0000000": {
        "x-oold-sssom": {
          "predicate_id": "skos:exactMatch",
          "mapping_set_id": "https://w3id.org/oo-ld/schemas/mappings/pmdco.sssom.tsv",
          "object_source_version": "https://w3id.org/pmd/co/3.1.0"
        }
      }
    },
    "ChemicalComposition": {
      "emmo:EMMO_7efd64d1_05a1_49cd_a7f0_783ca050d4f3": {
        "x-oold-sssom": {
          "predicate_id": "skos:exactMatch",
          "mapping_set_id": "https://w3id.org/oo-ld/schemas/mappings/emmo.sssom.tsv",
          "comment": "ChemicalComposition, the union of total, partial and single component: a composition need not be complete"
        }
      },
      "pmd:PMD_0000551": {
        "x-oold-sssom": {
          "predicate_id": "skos:closeMatch",
          "mapping_set_id": "https://w3id.org/oo-ld/schemas/mappings/pmdco.sssom.tsv",
          "comment": "chemical composition is a quality of the material, not a symbolic construct"
        }
      }
    },
    "Component": {
      "emmo:EMMO_172e2c96_180b_40f8_a3e7_b624471f40c2": {
        "x-oold-sssom": {
          "predicate_id": "skos:closeMatch",
          "mapping_set_id": "https://w3id.org/oo-ld/schemas/mappings/emmo.sssom.tsv",
          "comment": "SingleComponentComposition"
        }
      },
      "pmd:PMD_0020102": {
        "x-oold-sssom": {
          "predicate_id": "skos:closeMatch",
          "mapping_set_id": "https://w3id.org/oo-ld/schemas/mappings/pmdco.sssom.tsv",
          "comment": "mass ratio, renamed from mass proportion in 3.1.0; holds while the amount is a mass fraction"
        }
      }
    },
    "composition": {
      "emmo:EMMO_51f426a6_af4a_4e91_a392_2b0bb635e2d5": {
        "x-oold-sssom": {
          "predicate_id": "skos:exactMatch",
          "mapping_set_id": "https://w3id.org/oo-ld/schemas/mappings/emmo.sssom.tsv",
          "comment": "hasChemicalComposition"
        }
      },
      "obo:RO_0000080": {
        "@reverse": "obo:RO_0000080",
        "x-oold-sssom": {
          "predicate_id": "skos:exactMatch",
          "mapping_set_id": "https://w3id.org/oo-ld/schemas/mappings/pmdco.sssom.tsv",
          "comment": "quality of, stated from the composition, so the term promotes as a reverse property"
        }
      }
    },
    "components": {
      "emmo:EMMO_b2282816_b7a3_44c6_b2cb_3feff1ceb7fe": {
        "x-oold-sssom": {
          "predicate_id": "skos:exactMatch",
          "mapping_set_id": "https://w3id.org/oo-ld/schemas/mappings/emmo.sssom.tsv",
          "comment": "hasSpatialTile; PMDco reaches the fractions through the specification instead, so it keeps the placeholder term"
        }
      }
    },
    "constituent": {
      "emmo:EMMO_18fdd2cd_4b0a_43a5_a938_66d8290a066c": {
        "@type": "@vocab",
        "x-oold-sssom": {
          "predicate_id": "skos:exactMatch",
          "mapping_set_id": "https://w3id.org/oo-ld/schemas/mappings/emmo.sssom.tsv",
          "object_source_version": "https://w3id.org/emmo/1.0.4",
          "comment": "hasSpeciesPart, 1.0.4 only; PMDco carries the species in the portion's class, which needs a node this schema does not mint"
        }
      }
    },
    "amount": {
      "emmo:EMMO_95d706e4_8b16_48a1_8dfd_40ccd4df1c12": {
        "x-oold-sssom": {
          "predicate_id": "skos:exactMatch",
          "mapping_set_id": "https://w3id.org/oo-ld/schemas/mappings/emmo.sssom.tsv",
          "object_source_version": "https://w3id.org/emmo/1.0.4",
          "comment": "hasQuantityPart, 1.0.4 only"
        }
      },
      "pmd:PMD_0000077": {
        "x-oold-sssom": {
          "predicate_id": "skos:exactMatch",
          "mapping_set_id": "https://w3id.org/oo-ld/schemas/mappings/pmdco.sssom.tsv",
          "comment": "specified by value"
        }
      }
    },
    "MassFraction": {
      "emmo:EMMO_7c055d65_2929_40e1_af4f_4bf10995ad50": {
        "x-oold-sssom": {
          "predicate_id": "skos:exactMatch",
          "mapping_set_id": "https://w3id.org/oo-ld/schemas/mappings/emmo.sssom.tsv",
          "object_source_version": "https://w3id.org/emmo/1.0.4",
          "comment": "MassFraction, a ChemicalCompositionQuantity"
        }
      },
      "pmd:PMD_0025997": {
        "x-oold-sssom": {
          "predicate_id": "skos:closeMatch",
          "mapping_set_id": "https://w3id.org/oo-ld/schemas/mappings/pmdco.sssom.tsv",
          "object_source_version": "https://w3id.org/pmd/co/3.1.0",
          "comment": "fraction value specification is an information entity, so the match is close rather than exact"
        }
      }
    },
    "value": {
      "schema:value": {
        "x-oold-sssom": {
          "predicate_id": "skos:exactMatch",
          "mapping_set_id": "https://w3id.org/oo-ld/schemas/mappings/schemaorg.sssom.tsv"
        }
      },
      "obo:OBI_0001937": {
        "x-oold-sssom": {
          "predicate_id": "skos:exactMatch",
          "mapping_set_id": "https://w3id.org/oo-ld/schemas/mappings/pmdco.sssom.tsv"
        }
      }
    },
    "unit": {
      "schema:unitCode": {
        "@type": "@vocab",
        "x-oold-sssom": {
          "predicate_id": "skos:exactMatch",
          "mapping_set_id": "https://w3id.org/oo-ld/schemas/mappings/schemaorg.sssom.tsv",
          "comment": "URL branch of schema:unitCode, carrying the QUDT unit IRI"
        }
      },
      "obo:IAO_0000039": {
        "@type": "@vocab",
        "x-oold-sssom": {
          "predicate_id": "skos:closeMatch",
          "mapping_set_id": "https://w3id.org/oo-ld/schemas/mappings/pmdco.sssom.tsv",
          "comment": "range is iao:measurement unit label; unit-label vs QUDT-IRI mapping needed"
        }
      },
      "emmo:EMMO_eeb06032_dd4f_476e_9da6_aa24302b7588": {
        "@type": "@vocab",
        "x-oold-sssom": {
          "predicate_id": "skos:exactMatch",
          "mapping_set_id": "https://w3id.org/oo-ld/schemas/mappings/emmo.sssom.tsv",
          "object_source": "https://w3id.org/emmo",
          "object_source_version": "https://w3id.org/emmo/1.0.4",
          "comment": "hasReferencePart; pinned 1.0.4 branch snapshot (units are individuals there)"
        }
      }
    },
    "standard_uncertainty": {
      "emmo:EMMO_bba7f0f0_3707_42b9_b3fa_fd04610ef147": {
        "x-oold-sssom": {
          "predicate_id": "skos:exactMatch",
          "mapping_set_id": "https://w3id.org/oo-ld/schemas/mappings/emmo.sssom.tsv",
          "object_source_version": "https://w3id.org/emmo/1.0.4",
          "comment": "standardUncertainty (VIM4 3.6); 1.0.4 branch only"
        }
      }
    },
    "percent": {
      "emmo:WeightPercent": {
        "x-oold-sssom": {
          "predicate_id": "skos:exactMatch",
          "mapping_set_id": "https://w3id.org/oo-ld/schemas/mappings/emmo.sssom.tsv",
          "comment": "the quantity decides that percent is by mass, so the same alias resolves differently in a VolumeFraction"
        }
      },
      "obo:UO_0000163": {
        "x-oold-sssom": {
          "predicate_id": "skos:exactMatch",
          "mapping_set_id": "https://w3id.org/oo-ld/schemas/mappings/pmdco.sssom.tsv",
          "comment": "UO mass percentage"
        }
      }
    },
    "part_per_million": {
      "emmo:PartPerMillion": {
        "x-oold-sssom": {
          "predicate_id": "skos:exactMatch",
          "mapping_set_id": "https://w3id.org/oo-ld/schemas/mappings/emmo.sssom.tsv",
          "object_source_version": "https://w3id.org/emmo/1.0.4"
        }
      },
      "obo:UO_0000169": {
        "x-oold-sssom": {
          "predicate_id": "skos:exactMatch",
          "mapping_set_id": "https://w3id.org/oo-ld/schemas/mappings/pmdco.sssom.tsv",
          "comment": "UO parts per million"
        }
      }
    }
  }
}