> ## Documentation Index > Fetch the complete documentation index at: https://docs.abbyy.com/llms.txt > Use this file to discover all available pages before exploring further. # DocumentDefinition > The DocumentDefinition object in Vantage JSON output describes the structure of extracted data and lists the fields a Document skill can extract. **DocumentDefinition** contains an object of type **RootConcept**. ## DocumentDefinition | Property | Type | Description | | :------------ | :-------- | :--------------------------------------------- | | `RootConcept` | `Concept` | The root concept of the extracted information. | Extracted elements are represented by concepts. Each concept corresponds to one type of object and has a unique name, ID, and fields description. ## Concept | Property | Type | Description | | :------- | :---------------- | :------------------------------------------------------ | | `Id` | `String` | The ID of the concept. | | `Name` | `String` | The name of the concept. | | `Fields` | `ConceptField []` | A description of the structure of the extracted fields. | **ConceptField** describes the structure of the extracted fields. A field may contain values of different types, either simple (e.g. string, data, number, bool, or image) or combined (i.e. a child object). ## ConceptField | Property | Type | Description | | :---------------- | :--------------------------------------------------------------------- | :------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | | `Id` | `String` | The ID of the field. | | `Name` | `String` | The name of the field. | | `Type` | `Enum {Concept / String / Image / ISOdate / Boolean / Decimal / Enum}` | The type of field data. | | `EnumValues` | `EnumValue []` | The enumeration of the possible field values. **Note:** This property is not implemented. | | `Cardinality` | `Cardinality` | Whether the field recurs multiple time in the document. | | `ValueConcepts` | `Concept []` | A description of the child concepts. | | `ValueConceptIds` | `String []` | An array of the IDs of the child concepts. This property becomes available only if one concept is a child of multiple parent concepts. The child concept will be written in its entirety in the **ValueConcepts** property of one of its parent concepts. The other parent concepts will only get its identifier in their **ValueConceptIds** property. | **EnumValue** describes the Enum element of the **ConceptField** object. ## EnumValue | Property | Type | Description | | :------- | :------- | :----------------------- | | `Id` | `String` | The ID of the element. | | `Name` | `String` | The name of the element. | The **EnumValues** property is not implemented. **Cardinality** specifies whether the field recurs multiple times in the document. ## Cardinality | Property | Type | Description | | :------- | :-------- | :------------------------------- | | `Min` | `Integer` | The minimum number of instances. | | `Max` | `Integer` | The maximum number of instances. | If Min=0 and Max=1, the field must not recur in the document. If Min=0 and Max= -1, the field may recur multiple times in the document.