Class: ClassDerivation

A specification of how to derive a target class from a source class.

URI: [linkmlmap:ClassDerivation](https://w3id.org/linkml/transformer/ClassDerivation) 
 classDiagram
    class ClassDerivation
    click ClassDerivation href "../ClassDerivation/"
      ElementDerivation <|-- ClassDerivation
        click ElementDerivation href "../ElementDerivation/"

      ClassDerivation : comments

      ClassDerivation : copy_directives





        ClassDerivation --> "*" CopyDirective : copy_directives
        click CopyDirective href "../CopyDirective/"



      ClassDerivation : description

      ClassDerivation : expression_mappings





        ClassDerivation --> "*" KeyVal : expression_mappings
        click KeyVal href "../KeyVal/"



      ClassDerivation : expression_to_expression_mappings





        ClassDerivation --> "*" KeyVal : expression_to_expression_mappings
        click KeyVal href "../KeyVal/"



      ClassDerivation : expression_to_value_mappings





        ClassDerivation --> "*" KeyVal : expression_to_value_mappings
        click KeyVal href "../KeyVal/"



      ClassDerivation : implements

      ClassDerivation : is_a





        ClassDerivation --> "0..1" ElementDerivation : is_a
        click ElementDerivation href "../ElementDerivation/"



      ClassDerivation : joins





        ClassDerivation --> "*" AliasedClass : joins
        click AliasedClass href "../AliasedClass/"



      ClassDerivation : mirror_source

      ClassDerivation : mixins





        ClassDerivation --> "*" ElementDerivation : mixins
        click ElementDerivation href "../ElementDerivation/"



      ClassDerivation : name

      ClassDerivation : overrides





        ClassDerivation --> "0..1" Any : overrides
        click Any href "../Any/"



      ClassDerivation : pivot_operation





        ClassDerivation --> "0..1" PivotOperation : pivot_operation
        click PivotOperation href "../PivotOperation/"



      ClassDerivation : populated_from

      ClassDerivation : slot_derivations





        ClassDerivation --> "*" SlotDerivation : slot_derivations
        click SlotDerivation href "../SlotDerivation/"



      ClassDerivation : sources

      ClassDerivation : target_definition





        ClassDerivation --> "0..1" Any : target_definition
        click Any href "../Any/"



      ClassDerivation : value_mappings





        ClassDerivation --> "*" KeyVal : value_mappings
        click KeyVal href "../KeyVal/"
## Inheritance * [SpecificationComponent](SpecificationComponent.md) * [ElementDerivation](ElementDerivation.md) * **ClassDerivation** ## Slots | Name | Cardinality and Range | Description | Inheritance | | --- | --- | --- | --- | | [populated_from](populated_from.md) | 0..1
[ClassReference](ClassReference.md) | Source class to derive this target class from | direct | | [sources](sources.md) | *
[ClassReference](ClassReference.md) | Deprecated | direct | | [joins](joins.md) | *
[AliasedClass](AliasedClass.md) | Additional classes to be joined to derive instances of the target class | direct | | [slot_derivations](slot_derivations.md) | *
[SlotDerivation](SlotDerivation.md) | | direct | | [target_definition](target_definition.md) | 0..1
[Any](Any.md) | LinkML class definition object for this slot | direct | | [pivot_operation](pivot_operation.md) | 0..1
[PivotOperation](PivotOperation.md) | Configuration for pivot (unmelt) operations at class level | direct | | [name](name.md) | 1
[String](String.md) | Name of the element in the target schema | [ElementDerivation](ElementDerivation.md) | | [copy_directives](copy_directives.md) | *
[CopyDirective](CopyDirective.md) | | [ElementDerivation](ElementDerivation.md) | | [overrides](overrides.md) | 0..1
[Any](Any.md) | overrides source schema slots | [ElementDerivation](ElementDerivation.md) | | [is_a](is_a.md) | 0..1
[ElementDerivation](ElementDerivation.md) | | [ElementDerivation](ElementDerivation.md) | | [mixins](mixins.md) | *
[ElementDerivation](ElementDerivation.md) | | [ElementDerivation](ElementDerivation.md) | | [value_mappings](value_mappings.md) | *
[KeyVal](KeyVal.md) | A mapping table that is applied directly to mappings, in order of precedence | [ElementDerivation](ElementDerivation.md) | | [expression_mappings](expression_mappings.md) | *
[KeyVal](KeyVal.md) | A mapping table where the values are expressions evaluated against source bin... | [ElementDerivation](ElementDerivation.md) | | [expression_to_value_mappings](expression_to_value_mappings.md) | *
[KeyVal](KeyVal.md) | A mapping table in which the keys are boolean expressions and the values are ... | [ElementDerivation](ElementDerivation.md) | | [expression_to_expression_mappings](expression_to_expression_mappings.md) | *
[KeyVal](KeyVal.md) | A mapping table in which the keys and values are expressions | [ElementDerivation](ElementDerivation.md) | | [mirror_source](mirror_source.md) | 0..1
[Boolean](Boolean.md) | | [ElementDerivation](ElementDerivation.md) | | [description](description.md) | 0..1
[String](String.md) | description of the specification component | [SpecificationComponent](SpecificationComponent.md) | | [implements](implements.md) | *
[Uriorcurie](Uriorcurie.md) | A reference to a specification that this component implements | [SpecificationComponent](SpecificationComponent.md) | | [comments](comments.md) | *
[String](String.md) | A list of comments about this component | [SpecificationComponent](SpecificationComponent.md) | ## Usages | used by | used in | type | used | | --- | --- | --- | --- | | [TransformationSpecification](TransformationSpecification.md) | [class_derivations](class_derivations.md) | range | [ClassDerivation](ClassDerivation.md) | | [ObjectDerivation](ObjectDerivation.md) | [class_derivations](class_derivations.md) | range | [ClassDerivation](ClassDerivation.md) | | [SlotDerivation](SlotDerivation.md) | [class_derivations](class_derivations.md) | range | [ClassDerivation](ClassDerivation.md) | ## Identifier and Mapping Information ### Schema Source * from schema: https://w3id.org/linkml/transformer ## Mappings | Mapping Type | Mapped Value | | --- | --- | | self | linkmlmap:ClassDerivation | | native | linkmlmap:ClassDerivation | ## LinkML Source ### Direct 
name: ClassDerivation
description: A specification of how to derive a target class from a source class.
from_schema: https://w3id.org/linkml/transformer
is_a: ElementDerivation
attributes:
  populated_from:
    name: populated_from
    description: Source class to derive this target class from.
    from_schema: https://w3id.org/linkml/transformer
    rank: 1000
    domain_of:
    - ClassDerivation
    - SlotDerivation
    - EnumDerivation
    - PermissibleValueDerivation
    range: ClassReference
  sources:
    name: sources
    description: Deprecated. Use populated_from instead.
    deprecated: Deprecated. Use populated_from instead. See https://github.com/linkml/linkml-map/issues/193
      for planned list support in populated_from. Will be removed in a future version.
    from_schema: https://w3id.org/linkml/transformer
    rank: 1000
    domain_of:
    - ClassDerivation
    - SlotDerivation
    - EnumDerivation
    - PermissibleValueDerivation
    range: ClassReference
    multivalued: true
  joins:
    name: joins
    description: Additional classes to be joined to derive instances of the target
      class
    comments:
    - supports cross-table lookups via source_key/lookup_key or the join_on field
    from_schema: https://w3id.org/linkml/transformer
    rank: 1000
    domain_of:
    - ClassDerivation
    range: AliasedClass
    multivalued: true
    inlined: true
  slot_derivations:
    name: slot_derivations
    from_schema: https://w3id.org/linkml/transformer
    domain_of:
    - TransformationSpecification
    - ClassDerivation
    range: SlotDerivation
    multivalued: true
    inlined: true
  target_definition:
    name: target_definition
    description: LinkML class definition object for this slot.
    comments:
    - currently defined as Any to avoid coupling with metamodel
    from_schema: https://w3id.org/linkml/transformer
    rank: 1000
    domain_of:
    - ClassDerivation
    - SlotDerivation
    range: Any
  pivot_operation:
    name: pivot_operation
    description: Configuration for pivot (unmelt) operations at class level
    from_schema: https://w3id.org/linkml/transformer
    rank: 1000
    domain_of:
    - ClassDerivation
    - SlotDerivation
    range: PivotOperation
### Induced 
name: ClassDerivation
description: A specification of how to derive a target class from a source class.
from_schema: https://w3id.org/linkml/transformer
is_a: ElementDerivation
attributes:
  populated_from:
    name: populated_from
    description: Source class to derive this target class from.
    from_schema: https://w3id.org/linkml/transformer
    rank: 1000
    owner: ClassDerivation
    domain_of:
    - ClassDerivation
    - SlotDerivation
    - EnumDerivation
    - PermissibleValueDerivation
    range: ClassReference
  sources:
    name: sources
    description: Deprecated. Use populated_from instead.
    deprecated: Deprecated. Use populated_from instead. See https://github.com/linkml/linkml-map/issues/193
      for planned list support in populated_from. Will be removed in a future version.
    from_schema: https://w3id.org/linkml/transformer
    rank: 1000
    owner: ClassDerivation
    domain_of:
    - ClassDerivation
    - SlotDerivation
    - EnumDerivation
    - PermissibleValueDerivation
    range: ClassReference
    multivalued: true
  joins:
    name: joins
    description: Additional classes to be joined to derive instances of the target
      class
    comments:
    - supports cross-table lookups via source_key/lookup_key or the join_on field
    from_schema: https://w3id.org/linkml/transformer
    rank: 1000
    owner: ClassDerivation
    domain_of:
    - ClassDerivation
    range: AliasedClass
    multivalued: true
    inlined: true
  slot_derivations:
    name: slot_derivations
    from_schema: https://w3id.org/linkml/transformer
    owner: ClassDerivation
    domain_of:
    - TransformationSpecification
    - ClassDerivation
    range: SlotDerivation
    multivalued: true
    inlined: true
  target_definition:
    name: target_definition
    description: LinkML class definition object for this slot.
    comments:
    - currently defined as Any to avoid coupling with metamodel
    from_schema: https://w3id.org/linkml/transformer
    rank: 1000
    owner: ClassDerivation
    domain_of:
    - ClassDerivation
    - SlotDerivation
    range: Any
  pivot_operation:
    name: pivot_operation
    description: Configuration for pivot (unmelt) operations at class level
    from_schema: https://w3id.org/linkml/transformer
    rank: 1000
    owner: ClassDerivation
    domain_of:
    - ClassDerivation
    - SlotDerivation
    range: PivotOperation
  name:
    name: name
    description: Name of the element in the target schema
    from_schema: https://w3id.org/linkml/transformer
    identifier: true
    owner: ClassDerivation
    domain_of:
    - SchemaReference
    - ElementDerivation
    - ObjectDerivation
    - SlotDerivation
    - EnumDerivation
    - PermissibleValueDerivation
    - Agent
    range: string
    required: true
  copy_directives:
    name: copy_directives
    from_schema: https://w3id.org/linkml/transformer
    owner: ClassDerivation
    domain_of:
    - TransformationSpecification
    - ElementDerivation
    range: CopyDirective
    multivalued: true
    inlined: true
  overrides:
    name: overrides
    description: overrides source schema slots
    from_schema: https://w3id.org/linkml/transformer
    rank: 1000
    owner: ClassDerivation
    domain_of:
    - ElementDerivation
    range: Any
  is_a:
    name: is_a
    from_schema: https://w3id.org/linkml/transformer
    rank: 1000
    slot_uri: linkml:is_a
    owner: ClassDerivation
    domain_of:
    - ElementDerivation
    range: ElementDerivation
  mixins:
    name: mixins
    from_schema: https://w3id.org/linkml/transformer
    rank: 1000
    slot_uri: linkml:mixins
    owner: ClassDerivation
    domain_of:
    - ElementDerivation
    range: ElementDerivation
    multivalued: true
    inlined: false
  value_mappings:
    name: value_mappings
    description: A mapping table that is applied directly to mappings, in order of
      precedence. Keys should always be quoted in YAML to prevent type coercion —
      unquoted true/false become booleans and bare numbers become integers, which
      will not match the stringified source value used for lookup.
    from_schema: https://w3id.org/linkml/transformer
    rank: 1000
    owner: ClassDerivation
    domain_of:
    - ElementDerivation
    range: KeyVal
    multivalued: true
    inlined: true
  expression_mappings:
    name: expression_mappings
    description: A mapping table where the values are expressions evaluated against
      source bindings. Looked up by the same key as value_mappings (the stringified
      source value). Keys should always be quoted (see value_mappings). If both value_mappings
      and expression_mappings are present, value_mappings takes precedence for keys
      that appear in both.
    from_schema: https://w3id.org/linkml/transformer
    rank: 1000
    owner: ClassDerivation
    domain_of:
    - ElementDerivation
    range: KeyVal
    multivalued: true
    inlined: true
  expression_to_value_mappings:
    name: expression_to_value_mappings
    description: 'A mapping table in which the keys are boolean expressions and the
      values are literal results. On enum derivations, used for scalar binning: each
      key is evaluated with value() bound to the incoming value, and the first truthy
      key''s value is returned as the target permissible value. See issue #99.'
    from_schema: https://w3id.org/linkml/transformer
    rank: 1000
    owner: ClassDerivation
    domain_of:
    - ElementDerivation
    range: KeyVal
    multivalued: true
    inlined: true
  expression_to_expression_mappings:
    name: expression_to_expression_mappings
    description: A mapping table in which the keys and values are expressions
    deprecated: 'Deprecated: use case() with and/or operators instead (#127). Will
      be removed before 1.0.'
    from_schema: https://w3id.org/linkml/transformer
    rank: 1000
    owner: ClassDerivation
    domain_of:
    - ElementDerivation
    range: KeyVal
    multivalued: true
    inlined: true
  mirror_source:
    name: mirror_source
    from_schema: https://w3id.org/linkml/transformer
    rank: 1000
    owner: ClassDerivation
    domain_of:
    - ElementDerivation
    range: boolean
  description:
    name: description
    description: description of the specification component
    from_schema: https://w3id.org/linkml/transformer
    rank: 1000
    slot_uri: dcterms:description
    owner: ClassDerivation
    domain_of:
    - SpecificationComponent
    range: string
  implements:
    name: implements
    description: A reference to a specification that this component implements.
    from_schema: https://w3id.org/linkml/transformer
    rank: 1000
    owner: ClassDerivation
    domain_of:
    - SpecificationComponent
    range: uriorcurie
    multivalued: true
  comments:
    name: comments
    description: A list of comments about this component. Comments are free text,
      and may be used to provide additional information about the component, including
      instructions for its use.
    from_schema: https://w3id.org/linkml/transformer
    rank: 1000
    slot_uri: rdfs:comment
    owner: ClassDerivation
    domain_of:
    - SpecificationComponent
    range: string
    multivalued: true