{
  "$defs": {
    "Atmosphere": {
      "additionalProperties": false,
      "description": "Atmospheric conditions and gas composition during the experiment.",
      "properties": {
        "comment": {
          "description": "Additional notes about the atmosphere.",
          "type": [
            "string",
            "null"
          ]
        },
        "components": {
          "description": "Gas components present in the atmosphere.",
          "items": {
            "$ref": "#/$defs/Component"
          },
          "type": [
            "array",
            "null"
          ]
        },
        "description": {
          "description": "Detailed description of the atmospheric conditions.",
          "type": [
            "string",
            "null"
          ]
        },
        "totalOrganicCarbon": {
          "anyOf": [
            {
              "$ref": "#/$defs/Quantity"
            },
            {
              "type": "null"
            }
          ],
          "description": "Total organic carbon content measurement in the atmosphere."
        },
        "type": {
          "description": "Type of atmospheric condition, such as inert (Ar saturated), ambient, UHV (ultra high vacuum).",
          "type": [
            "string",
            "null"
          ]
        },
        "url": {
          "description": "URL with further details on the atmospheric setup or control system.",
          "pattern": "^https?://.*$",
          "type": [
            "string",
            "null"
          ]
        }
      },
      "title": "Atmosphere",
      "type": "object"
    },
    "ChemicalIdentifiers": {
      "additionalProperties": false,
      "description": "Standard chemical identifiers for unambiguous identification of compounds.",
      "properties": {
        "cas": {
          "description": "CAS Registry Number (Chemical Abstracts Service identifier).",
          "type": [
            "string",
            "null"
          ]
        },
        "inchi": {
          "description": "InChI (International Chemical Identifier) string.",
          "type": [
            "string",
            "null"
          ]
        },
        "inchikey": {
          "description": "InChIKey (hashed InChI for easier searching).",
          "type": [
            "string",
            "null"
          ]
        }
      },
      "title": "ChemicalIdentifiers",
      "type": "object"
    },
    "Component": {
      "additionalProperties": false,
      "description": "A chemical component of the electrolyte solution.",
      "properties": {
        "chemicalIdentifiers": {
          "anyOf": [
            {
              "$ref": "#/$defs/ChemicalIdentifiers"
            },
            {
              "type": "null"
            }
          ],
          "description": "Standard chemical identifiers (CAS, SMILES, InChI, etc.) for unambiguous identification."
        },
        "comment": {
          "description": "Additional notes or observations about this component.",
          "type": [
            "string",
            "null"
          ]
        },
        "concentration": {
          "anyOf": [
            {
              "$ref": "#/$defs/Quantity"
            },
            {
              "type": "null"
            }
          ],
          "description": "Concentration of the component in the electrolyte."
        },
        "flow": {
          "anyOf": [
            {
              "$ref": "#/$defs/Quantity"
            },
            {
              "type": "null"
            }
          ],
          "description": "Flow rate for gaseous components."
        },
        "name": {
          "description": "Name or identifier of the chemical component (trivial name, formula, or IUPAC name).",
          "type": "string"
        },
        "partialPressure": {
          "anyOf": [
            {
              "$ref": "#/$defs/Quantity"
            },
            {
              "type": "null"
            }
          ],
          "description": "Partial pressure of a gaseous / volatile component."
        },
        "pressure": {
          "anyOf": [
            {
              "$ref": "#/$defs/Quantity"
            },
            {
              "type": "null"
            }
          ],
          "description": "Pressure for gaseous components."
        },
        "proportion": {
          "anyOf": [
            {
              "$ref": "#/$defs/Quantity"
            },
            {
              "type": "null"
            }
          ],
          "description": "Proportion of the component (e.g., volume percent, mole fraction)."
        },
        "purity": {
          "anyOf": [
            {
              "$ref": "#/$defs/Purity"
            },
            {
              "type": "null"
            }
          ],
          "description": "Purity level of the chemical component after the purification process."
        },
        "source": {
          "anyOf": [
            {
              "$ref": "#/$defs/ComponentSource"
            },
            {
              "type": "null"
            }
          ],
          "description": "Information about the supplier and supplied quality of the chemical."
        },
        "type": {
          "$ref": "#/$defs/ComponentType",
          "description": "Role or function of the component in the electrolyte."
        }
      },
      "required": [
        "name",
        "type"
      ],
      "title": "Component",
      "type": "object"
    },
    "ComponentSource": {
      "additionalProperties": false,
      "description": "Information about the source and quality of the chemical component.",
      "properties": {
        "lot": {
          "description": "LOT or batch number provided by the manufacturer or supplier for traceability.",
          "type": [
            "string",
            "null"
          ]
        },
        "manufacturer": {
          "description": "Name of the company or organization that manufactured the chemical.",
          "type": [
            "string",
            "null"
          ]
        },
        "purity": {
          "anyOf": [
            {
              "$ref": "#/$defs/Purity"
            },
            {
              "type": "null"
            }
          ],
          "description": "Stated purity level from the supplier or manufacturer."
        },
        "quality": {
          "description": "Quality grade of the chemical.",
          "type": [
            "string",
            "null"
          ]
        },
        "refinement": {
          "description": "Any additional purification or treatment performed.",
          "type": [
            "string",
            "null"
          ]
        },
        "supplier": {
          "description": "Name of the company that supplied the chemical.",
          "type": [
            "string",
            "null"
          ]
        }
      },
      "title": "ComponentSource",
      "type": "object"
    },
    "ComponentType": {
      "description": "Role or function of the component in the electrolyte.",
      "enum": [
        "solvent",
        "salt",
        "acid",
        "base",
        "gas",
        "solute"
      ],
      "title": "ComponentType",
      "type": "string"
    },
    "Curation": {
      "additionalProperties": false,
      "description": "Details on the curation process of the data.",
      "properties": {
        "process": {
          "description": "List of people involved in creating, recording, or curating this data.",
          "items": {
            "$ref": "#/$defs/Process"
          },
          "type": "array"
        }
      },
      "required": [
        "process"
      ],
      "title": "Curation",
      "type": "object"
    },
    "CurationRole": {
      "description": "Role of a person in the data curation process.",
      "enum": [
        "experimentalist",
        "curator",
        "reviewer",
        "supervisor"
      ],
      "title": "CurationRole",
      "type": "string"
    },
    "DataField": {
      "additionalProperties": false,
      "description": "Description of a data field (column) compatible with frictionless table-schema and extended with echemdb-specific properties for physical quantities.",
      "properties": {
        "description": {
          "description": "A description of that field.",
          "type": [
            "string",
            "null"
          ]
        },
        "dimension": {
          "description": "Physical dimension of the field (e.g., 'time', 'potential', 'current density').",
          "type": [
            "string",
            "null"
          ]
        },
        "format": {
          "description": "Format specification for the field type (default, email, uri, binary, uuid for strings; default for numbers).",
          "type": [
            "string",
            "null"
          ]
        },
        "name": {
          "description": "Name of the data field. Use single letters for specific systems. Otherwise use descriptive names like 't_rel', 'E_WE', or 'j_WE'.",
          "type": "string"
        },
        "orientation": {
          "$ref": "#/$defs/FieldOrientation",
          "description": "Axis orientation in plots (horizontal for x-axis, vertical for y-axis)."
        },
        "reference": {
          "description": "Reference electrode or reference point for this measurement (electrochemistry-specific).",
          "type": [
            "string",
            "null"
          ]
        },
        "title": {
          "description": "A human-readable title for this field.",
          "type": [
            "string",
            "null"
          ]
        },
        "type": {
          "description": "Data type of the field (string, number, integer, boolean, object, array, date, time, datetime, year, duration, geopoint, geojson, any).",
          "type": [
            "string",
            "null"
          ]
        },
        "unit": {
          "description": "Unit of measurement for this field (SI or conventional electrochemical units), following astropy's string unit notation.",
          "type": [
            "string",
            "null"
          ]
        }
      },
      "required": [
        "name"
      ],
      "title": "DataField",
      "type": "object"
    },
    "ElectrochemicalCell": {
      "additionalProperties": false,
      "description": "Description of the electrochemical cell setup and configuration.",
      "properties": {
        "cellDescription": {
          "description": "Detailed description of the cell configuration.",
          "type": [
            "string",
            "null"
          ]
        },
        "cleaningProcedure": {
          "description": "Procedure used to clean the cell before experiments.",
          "type": [
            "string",
            "null"
          ]
        },
        "components": {
          "description": "Physical components and parts of the cell that are in contact with the electrolyte.",
          "items": {
            "$ref": "#/$defs/ElectrochemicalCellComponent"
          },
          "type": [
            "array",
            "null"
          ]
        },
        "source": {
          "anyOf": [
            {
              "$ref": "#/$defs/ElectrochemicalCellSource"
            },
            {
              "type": "null"
            }
          ],
          "description": "Source and supplier information for the cell."
        },
        "type": {
          "description": "Type of electrochemical cell, such as H-cell, beaker glass, flow cell.",
          "type": [
            "string",
            "null"
          ]
        }
      },
      "title": "ElectrochemicalCell",
      "type": "object"
    },
    "ElectrochemicalCellComponent": {
      "additionalProperties": false,
      "description": "A component or part of the electrochemical cell.",
      "properties": {
        "description": {
          "description": "Detailed description of the component.",
          "type": [
            "string",
            "null"
          ]
        },
        "name": {
          "description": "Name or identifier of the component.",
          "type": "string"
        },
        "part": {
          "description": "Part number or designation.",
          "type": "string"
        }
      },
      "required": [
        "name",
        "part"
      ],
      "title": "ElectrochemicalCellComponent",
      "type": "object"
    },
    "ElectrochemicalCellSource": {
      "additionalProperties": false,
      "description": "Source information for the electrochemical cell.",
      "properties": {
        "url": {
          "description": "URL to product page or technical documentation.",
          "pattern": "^https?://.*$",
          "type": [
            "string",
            "null"
          ]
        }
      },
      "title": "ElectrochemicalCellSource",
      "type": "object"
    },
    "Electrode": {
      "additionalProperties": false,
      "description": "An electrode used in the electrochemical cell, such as working, reference, counter, or collector electrode.",
      "properties": {
        "crystallographicOrientation": {
          "description": "Miller indices of the surface orientation or 'poly' for polycrystalline. Always use spaces for value separation.",
          "type": [
            "string",
            "null"
          ]
        },
        "description": {
          "description": "Detailed description of the electrode (especially for custom-made electrodes).",
          "type": [
            "string",
            "null"
          ]
        },
        "function": {
          "description": "Role of the electrode in the electrochemical cell. Typical values: working electrode, counter electrode, reference electrode.",
          "type": "string"
        },
        "geometricElectrolyteContactArea": {
          "anyOf": [
            {
              "$ref": "#/$defs/Quantity"
            },
            {
              "type": "null"
            }
          ],
          "description": "Geometric surface area of electrode in contact with electrolyte."
        },
        "material": {
          "description": "Chemical symbol or abbreviation of the electrode material.",
          "type": [
            "string",
            "null"
          ]
        },
        "name": {
          "description": "Name or identifier for the electrode.",
          "type": "string"
        },
        "preparationProcedure": {
          "anyOf": [
            {
              "$ref": "#/$defs/ElectrodePreparation"
            },
            {
              "type": "null"
            }
          ],
          "description": "Procedures used to prepare the electrode before measurement."
        },
        "purity": {
          "anyOf": [
            {
              "$ref": "#/$defs/Purity"
            },
            {
              "type": "null"
            }
          ],
          "description": "Purity specifications of the electrode material."
        },
        "redoxSystem": {
          "description": "Name of the reference electrode redox system (RHE, SCE, Ag/AgCl, etc.).",
          "type": [
            "string",
            "null"
          ]
        },
        "shape": {
          "anyOf": [
            {
              "$ref": "#/$defs/Shape"
            },
            {
              "type": "null"
            }
          ],
          "description": "Physical shape and dimensions of the electrode."
        },
        "source": {
          "anyOf": [
            {
              "$ref": "#/$defs/ElectrodeSource"
            },
            {
              "type": "null"
            }
          ],
          "description": "Source and supplier information for the electrode."
        },
        "type": {
          "description": "Type of electrode, such as single crystal, powder catalyst, metal sheet, or metal wire.",
          "type": [
            "string",
            "null"
          ]
        }
      },
      "required": [
        "name",
        "function"
      ],
      "title": "Electrode",
      "type": "object"
    },
    "ElectrodeFunction": {
      "description": "Role of the electrode in the electrochemical cell.",
      "enum": [
        "working electrode",
        "counter electrode",
        "reference electrode"
      ],
      "title": "ElectrodeFunction",
      "type": "string"
    },
    "ElectrodePreparation": {
      "additionalProperties": false,
      "description": "Procedures and methods used to prepare the electrode.",
      "properties": {
        "description": {
          "description": "Step-by-step description of preparation procedure.",
          "items": {
            "type": "string"
          },
          "type": [
            "array",
            "null"
          ]
        },
        "url": {
          "description": "URL to detailed preparation protocol or procedure, such as an article DOI.",
          "pattern": "^https?://.*$",
          "type": [
            "string",
            "null"
          ]
        }
      },
      "title": "ElectrodePreparation",
      "type": "object"
    },
    "ElectrodeSource": {
      "additionalProperties": false,
      "description": "Information about the source and supplier of the electrode.",
      "properties": {
        "lot": {
          "description": "LOT or batch number.",
          "type": [
            "string",
            "null"
          ]
        },
        "manufacturer": {
          "description": "Name of the electrode manufacturer.",
          "type": [
            "string",
            "null"
          ]
        },
        "model": {
          "description": "Model number or designation.",
          "type": [
            "string",
            "null"
          ]
        },
        "purity": {
          "anyOf": [
            {
              "$ref": "#/$defs/Purity"
            },
            {
              "type": "null"
            }
          ],
          "description": "Purity specifications from the manufacturer or supplier."
        },
        "supplier": {
          "description": "Name of the supplier.",
          "type": [
            "string",
            "null"
          ]
        },
        "url": {
          "description": "URL to product specification or datasheet.",
          "pattern": "^https?://.*$",
          "type": [
            "string",
            "null"
          ]
        }
      },
      "title": "ElectrodeSource",
      "type": "object"
    },
    "Electrolyte": {
      "additionalProperties": false,
      "description": "The properties and components of the electrolyte solution.",
      "properties": {
        "comment": {
          "description": "Additional notes or observations about the electrolyte.",
          "type": [
            "string",
            "null"
          ]
        },
        "components": {
          "description": "Chemical components of the electrolyte including solvents, salts, acids, bases, and gases.",
          "items": {
            "$ref": "#/$defs/Component"
          },
          "type": [
            "array",
            "null"
          ]
        },
        "electrolyteContainer": {
          "anyOf": [
            {
              "$ref": "#/$defs/ElectrolyteContainer"
            },
            {
              "type": "null"
            }
          ],
          "description": "Container used to prepare or store the electrolyte before the measurement."
        },
        "ph": {
          "anyOf": [
            {
              "$ref": "#/$defs/Quantity"
            },
            {
              "type": "null"
            }
          ],
          "description": "pH value of the electrolyte solution."
        },
        "temperature": {
          "anyOf": [
            {
              "$ref": "#/$defs/Quantity"
            },
            {
              "type": "null"
            }
          ],
          "description": "Temperature of the electrolyte during the experiment."
        },
        "type": {
          "$ref": "#/$defs/ElectrolyteType",
          "description": "Type of electrolyte defined by the solvent."
        }
      },
      "required": [
        "type"
      ],
      "title": "Electrolyte",
      "type": "object"
    },
    "ElectrolyteContainer": {
      "additionalProperties": false,
      "description": "Container used to prepare or store the electrolyte before the measurement.",
      "properties": {
        "components": {
          "description": "Components of the electrolyte container.",
          "items": {
            "$ref": "#/$defs/ElectrolyteContainerComponent"
          },
          "type": [
            "array",
            "null"
          ]
        },
        "description": {
          "description": "The vessel in which the supplying electrolyte was prepared or stored before the measurement.",
          "type": [
            "string",
            "null"
          ]
        }
      },
      "title": "ElectrolyteContainer",
      "type": "object"
    },
    "ElectrolyteContainerComponent": {
      "additionalProperties": false,
      "description": "A component of the electrolyte container.",
      "properties": {
        "comment": {
          "description": "Additional notes.",
          "type": [
            "string",
            "null"
          ]
        },
        "name": {
          "description": "A unique identifier.",
          "type": [
            "string",
            "null"
          ]
        },
        "type": {
          "description": "The type of the container, i.e., a flask.",
          "type": [
            "string",
            "null"
          ]
        }
      },
      "title": "ElectrolyteContainerComponent",
      "type": "object"
    },
    "ElectrolyteType": {
      "description": "Type of electrolyte defined by the solvent.",
      "enum": [
        "aqueous",
        "ionic liquid",
        "non-aqueous",
        "solid"
      ],
      "title": "ElectrolyteType",
      "type": "string"
    },
    "Experimental": {
      "additionalProperties": false,
      "description": "Details about the configuration of the experimental setup.",
      "properties": {
        "description": {
          "description": "Detailed description of the experimental setup and conditions.",
          "type": [
            "string",
            "null"
          ]
        },
        "instrumentation": {
          "description": "Instruments and equipment used in the experiment.",
          "items": {
            "$ref": "#/$defs/Instrumentation"
          },
          "type": [
            "array",
            "null"
          ]
        },
        "tags": {
          "description": "Keywords or tags describing the experiment, such as BCV, ORR, COOR, XPS, or MS.",
          "items": {
            "type": "string"
          },
          "type": [
            "array",
            "null"
          ]
        },
        "url": {
          "description": "URL to related documentation, publication (DOI), or ELN entry.",
          "pattern": "^https?://.*$",
          "type": [
            "string",
            "null"
          ]
        }
      },
      "title": "Experimental",
      "type": "object"
    },
    "FieldOrientation": {
      "description": "Axis orientation in plots.",
      "enum": [
        "horizontal",
        "vertical"
      ],
      "title": "FieldOrientation",
      "type": "string"
    },
    "FigureDescription": {
      "additionalProperties": false,
      "description": "Description of the data to a figure or plot including data type and measurement details.",
      "properties": {
        "comment": {
          "description": "Additional notes about the figure or data.",
          "type": [
            "string",
            "null"
          ]
        },
        "fields": {
          "description": "Description of data fields/columns in the figure.",
          "items": {
            "$ref": "#/$defs/DataField"
          },
          "type": [
            "array",
            "null"
          ]
        },
        "measurementType": {
          "description": "Acronym type for the measurement performed, such as CV, EIS, XPS, etc.",
          "type": [
            "string",
            "null"
          ]
        },
        "scanRate": {
          "anyOf": [
            {
              "$ref": "#/$defs/Quantity"
            },
            {
              "type": "null"
            }
          ],
          "description": "The rate at which the data has been recorded."
        },
        "simultaneousMeasurements": {
          "description": "Other measurements performed simultaneously, such as ring current, IR, Raman, ICP-MS.",
          "items": {
            "type": "string"
          },
          "type": [
            "array",
            "null"
          ]
        },
        "type": {
          "$ref": "#/$defs/FigureDescriptionType",
          "description": "Source or origin of the data, such as digitized, raw, simulated, or processed."
        }
      },
      "required": [
        "type"
      ],
      "title": "FigureDescription",
      "type": "object"
    },
    "FigureDescriptionType": {
      "description": "Source or origin of the data.",
      "enum": [
        "digitized",
        "raw",
        "simulated",
        "processed"
      ],
      "title": "FigureDescriptionType",
      "type": "string"
    },
    "Instrumentation": {
      "additionalProperties": false,
      "description": "The instruments used to perform the experiment.",
      "properties": {
        "manufacturer": {
          "description": "Manufacturer of the instrument.",
          "type": [
            "string",
            "null"
          ]
        },
        "model": {
          "description": "Model number or designation.",
          "type": [
            "string",
            "null"
          ]
        },
        "name": {
          "description": "Name or identifier of the instrument.",
          "type": "string"
        },
        "supplier": {
          "description": "Supplier of the instrument.",
          "type": [
            "string",
            "null"
          ]
        },
        "type": {
          "description": "Type or category of instrument.",
          "type": [
            "string",
            "null"
          ]
        }
      },
      "required": [
        "name"
      ],
      "title": "Instrumentation",
      "type": "object"
    },
    "MinimumEchemdb": {
      "additionalProperties": false,
      "description": "Minimum set of metadata to describe an electrochemical system for echemdb.",
      "properties": {
        "curation": {
          "$ref": "#/$defs/Curation",
          "description": "Details on the curation process of the data."
        },
        "experimental": {
          "$ref": "#/$defs/Experimental",
          "description": "Details about the experimental setup."
        },
        "figureDescription": {
          "$ref": "#/$defs/FigureDescription",
          "description": "Description of the data to a figure or plot."
        },
        "source": {
          "$ref": "#/$defs/Source",
          "description": "Information about the source publication or dataset."
        },
        "system": {
          "$ref": "#/$defs/System",
          "description": "Description of the experimental system."
        }
      },
      "required": [
        "curation",
        "system",
        "figureDescription",
        "experimental",
        "source"
      ],
      "title": "MinimumEchemdb",
      "type": "object"
    },
    "Process": {
      "additionalProperties": false,
      "description": "A person involved in the data curation process.",
      "properties": {
        "date": {
          "description": "Date when the person performed their role (ISO 8601 format: YYYY-MM-DD).",
          "format": "date",
          "type": [
            "string",
            "null"
          ]
        },
        "name": {
          "description": "Full name of the person.",
          "type": "string"
        },
        "orcid": {
          "description": "An URL containing the ORCID.",
          "pattern": "^https?://.*$",
          "type": "string"
        },
        "role": {
          "$ref": "#/$defs/CurationRole",
          "description": "Role of the person in the data curation process."
        }
      },
      "required": [
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      "title": "Process",
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      "additionalProperties": false,
      "description": "Purity specifications of a chemical component.",
      "properties": {
        "container": {
          "description": "Name or identifier of the container in which the chemical is stored.",
          "type": [
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        },
        "grade": {
          "description": "Quality grade designation.",
          "type": [
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        "internalLot": {
          "description": "Internal LOT or batch number.",
          "type": [
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        "refinement": {
          "description": "Description of additional purification or treatment performed.",
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              "$ref": "#/$defs/Quantity"
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          ],
          "description": "Value for the total ionic conductivity measurement."
        },
        "totalOrganicCarbon": {
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            {
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          ],
          "description": "Value for the total organic carbon content measurement."
        },
        "unit": {
          "description": "Unit for purity value.",
          "type": [
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          ]
        },
        "url": {
          "description": "URL with further details on the purity or container.",
          "pattern": "^https?://.*$",
          "type": [
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        },
        "value": {
          "description": "Purity value as a number.",
          "type": [
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          ]
        }
      },
      "title": "Purity",
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    },
    "Quantity": {
      "additionalProperties": false,
      "description": "A physical quantity with a value, unit, and optional uncertainty.",
      "properties": {
        "calculation": {
          "description": "Method or formula used to calculate this quantity.",
          "type": [
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        },
        "comment": {
          "description": "Additional notes about the measurement or quantity.",
          "type": [
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          ],
          "description": "Uncertainty information for a measured quantity."
        },
        "unit": {
          "description": "Unit of measurement following astropy's string notation (e.g., 'mol / l', 'V', 'mA / cm2'). Use an empty string for dimensionless quantities.",
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        },
        "value": {
          "description": "Numerical value of the quantity.",
          "type": [
            "string",
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          ]
        }
      },
      "title": "Quantity",
      "type": "object"
    },
    "Shape": {
      "additionalProperties": false,
      "description": "Physical dimensions and shape of the electrode.",
      "properties": {
        "description": {
          "description": "Detailed description of the electrode shape.",
          "type": [
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        },
        "diameter": {
          "anyOf": [
            {
              "$ref": "#/$defs/Quantity"
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          ],
          "description": "Diameter of the electrode (for cylindrical shapes)."
        },
        "height": {
          "anyOf": [
            {
              "$ref": "#/$defs/Quantity"
            },
            {
              "type": "null"
            }
          ],
          "description": "Height of the electrode."
        },
        "length": {
          "anyOf": [
            {
              "$ref": "#/$defs/Quantity"
            },
            {
              "type": "null"
            }
          ],
          "description": "Length of the electrode."
        },
        "type": {
          "description": "Type or shape of electrode.",
          "type": [
            "string",
            "null"
          ]
        }
      },
      "title": "Shape",
      "type": "object"
    },
    "Source": {
      "additionalProperties": false,
      "description": "Information about the source publication or dataset.",
      "properties": {
        "bibdata": {
          "description": "BibTeX bibliographic data.",
          "type": [
            "string",
            "null"
          ]
        },
        "citationKey": {
          "description": "Unique citation key for bibliographic reference, usually <FirstAuthorName>_<Year>_<FirstWordOfTitle>_<FirstPageNumber>.",
          "type": "string"
        },
        "comment": {
          "description": "Additional notes about the source.",
          "type": [
            "string",
            "null"
          ]
        },
        "curve": {
          "description": "Specific curve or trace identifier within a figure.",
          "type": [
            "string",
            "null"
          ]
        },
        "figure": {
          "description": "Figure number or identifier from the source including subfigure label.",
          "type": [
            "string",
            "null"
          ]
        },
        "originalFilename": {
          "description": "Original filename of the data file.",
          "type": [
            "string",
            "null"
          ]
        },
        "techniques": {
          "description": "Experimental techniques used in the study.",
          "items": {
            "type": "string"
          },
          "type": [
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          ]
        },
        "url": {
          "description": "DOI (URL) to the publication or dataset.",
          "pattern": "^https?://.*$",
          "type": "string"
        }
      },
      "required": [
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      ],
      "title": "Source",
      "type": "object"
    },
    "System": {
      "additionalProperties": false,
      "description": "Description of the experimental system including electrodes, electrolyte, and environmental conditions.",
      "properties": {
        "atmosphere": {
          "anyOf": [
            {
              "$ref": "#/$defs/Atmosphere"
            },
            {
              "type": "null"
            }
          ],
          "description": "Atmospheric conditions during the experiment."
        },
        "electrochemicalCell": {
          "anyOf": [
            {
              "$ref": "#/$defs/ElectrochemicalCell"
            },
            {
              "type": "null"
            }
          ],
          "description": "Description of the electrochemical cell and its configuration."
        },
        "electrodes": {
          "description": "List of electrodes used in the electrochemical cell (working, reference, counter electrodes, ring electrodes).",
          "items": {
            "$ref": "#/$defs/Electrode"
          },
          "type": "array"
        },
        "electrolyte": {
          "$ref": "#/$defs/Electrolyte",
          "description": "The electrolyte solution used in the experiment."
        },
        "type": {
          "$ref": "#/$defs/SystemType",
          "description": "Type of experimental system."
        }
      },
      "required": [
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        "electrolyte",
        "electrodes"
      ],
      "title": "System",
      "type": "object"
    },
    "SystemType": {
      "description": "Type of experimental system.",
      "enum": [
        "electrochemical"
      ],
      "title": "SystemType",
      "type": "string"
    },
    "Uncertainty": {
      "additionalProperties": false,
      "description": "Uncertainty information for a measured quantity.",
      "properties": {
        "comment": {
          "description": "Additional information about the uncertainty estimation.",
          "type": [
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            "null"
          ]
        },
        "negativeValue": {
          "description": "Lower bound (-) for asymmetric uncertainties.",
          "type": [
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        },
        "positiveValue": {
          "description": "Upper bound (+) for asymmetric uncertainties.",
          "type": [
            "number",
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          ]
        },
        "type": {
          "$ref": "#/$defs/UncertaintyType",
          "description": "Type of uncertainty (absolute or relative)."
        },
        "unit": {
          "description": "Unit of the uncertainty value, following astropy's string notation. Use an empty string for dimensionless quantities.",
          "type": [
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            "null"
          ]
        },
        "value": {
          "description": "Symmetric uncertainty value (±).",
          "type": [
            "number",
            "null"
          ]
        }
      },
      "title": "Uncertainty",
      "type": "object"
    },
    "UncertaintyType": {
      "description": "Type of uncertainty measurement.",
      "enum": [
        "absolute",
        "relative"
      ],
      "title": "UncertaintyType",
      "type": "string"
    }
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  "$schema": "http://json-schema.org/draft-07/schema#",
  "additionalProperties": true,
  "description": "Minimum set of metadata to describe an electrochemical system for echemdb.",
  "metamodel_version": "1.7.0",
  "properties": {
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      "$ref": "#/$defs/Curation",
      "description": "Details on the curation process of the data."
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      "$ref": "#/$defs/Experimental",
      "description": "Details about the experimental setup."
    },
    "figureDescription": {
      "$ref": "#/$defs/FigureDescription",
      "description": "Description of the data to a figure or plot."
    },
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      "$ref": "#/$defs/Source",
      "description": "Information about the source publication or dataset."
    },
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      "$ref": "#/$defs/System",
      "description": "Description of the experimental system."
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}