> For the complete documentation index, see [llms.txt](https://docs.b2ihealthcare.com/snow-owl-authoring-platform/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.b2ihealthcare.com/snow-owl-authoring-platform/reference-sets/reference-set-types/map-type-reference-sets/complex-map-extended-with-map-block-type-reference-set.md).

# Complex Map Extended with Map Block type Reference Sets

This Reference Set type is an Extended Map type Reference Set, where the Map category contains a string value.

Mandatory properties to be specified in the New Member Wizard:

| Property                 | Description                                                                                                       |
| ------------------------ | ----------------------------------------------------------------------------------------------------------------- |
| **Referenced component** | The SNOMED CT component that is mapped to the other terminology or Code System                                    |
| **Map target**           | The target code in the target terminology, classification, or Code System                                         |
| **Map group**            | A value grouping a set of Complex Map records from which one may be selected as a target code                     |
| **Map priority**         | The order in which Complex Map records should be checked within a Map Group                                       |
| **Correlation**          | The correlation between the SNOMED CT component and the target code                                               |
| **Map category**         | The SNOMED CT component in the metadata hierarchy which represents the Map Category for the associated map member |
| **Module**               | The SNOMED CT module that contains this Reference Set member (primary module by default)                          |

Other properties:

| Property       | Description                                                                                                                                                     |
| -------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **Map rule**   | A machine-readable rule, (evaluating to either `true` or `false` at run-time) that indicates whether this map record should be selected within its Map Group    |
| **Map advice** | Human-readable advice, that may be used to give an end-user advice on selection of the appropriate target code from the alternatives presented within the group |


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