# CorrelatorsType (Complex Type)

### Namespace: http://midpoint.evolveum.com/xml/ns/public/common/common-3

User-friendly way of defining a correlator or correlators.

Item Summary
Name | Type | Multiplicity | Description
--- | --- | --- | ---
extension | container ExtensionType | [0,1] | Correlators not defined in the static schema.
none | container NoOpCorrelatorType | [0,-1] | "No-op" correlation that always returns "certainly no owner" result.
filter | container FilterCorrelatorType | [0,-1] | Correlation using a query filter.
expression | container ExpressionCorrelatorType | [0,-1] | Correlation using a custom expression.
idMatch | container IdMatchCorrelatorType | [0,-1] | Correlation using ID Match service.

- ### Items

  - #### extension

    Flags: RAM,runtime

    Multiplicity: [0,1]

    Correlators not defined in the static schema. (E.g. dummy correlator used for testing, or custom correlators.)

  - #### none

    Flags: RAM,runtime

    Multiplicity: [0,-1]

    "No-op" correlation that always returns "certainly no owner" result.

  - #### filter

    Flags: RAM,runtime

    Multiplicity: [0,-1]

    Correlation using a query filter.

  - #### expression

    Flags: RAM,runtime

    Multiplicity: [0,-1]

    Correlation using a custom expression.

  - #### idMatch

    Flags: RAM,runtime

    Multiplicity: [0,-1]

    Correlation using ID Match service. See https://spaces.at.internet2.edu/display/cifer/SOR-Registry+Strawman+ID+Match+API.