> 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/simple-map-type-reference-sets.md).
# Simple Map type Reference Sets
The Simple Map type Reference Set should be used for one-to-one mappings between SNOMED CT and alternative coding schemes. Although one-to-many mappings are allowed as well. It is possible to map to an external code system, using any of the imported terminologies or code systems as map sources.
To create a new Simple Map type Reference Set, right-click on the Simple map grouping concept in the Reference Set View and select  *New simple map reference set...* and specify:
| Field | Description |
| ------------------------------- | ------------------------------------------------ |
| **Refernce set preferred term** | A description for the new Map type Reference Set |
| **Referenced component type** | A SNOMED CT Concept or SNOMED CT Description |
| **Map target type** | The Code System of the target |
### **Adding members**
* Click the  *Add new reference set member button* in the Reference Set Editor
* Drag and drop concepts from the SNOMED CT Navigator
* Use the SNOMED CT Navigator Context Menu options
*  *Add concept(s) to the active reference set > Concept only*r
*  *Add concept(s) to the active reference set > Concept descendants only*
*  *Add concept(s) to the active reference set > Concept and descendants*
* Use the Search View Context Menu options
*  *Add concept to the active reference set*
*  *Add all results to active reference set*
{% hint style="info" %}
These options are only enabled when a Reference Set Editor is open and activated.
{% endhint %}
In case of Map type Reference Sets, the New Member Wizard pops up requiring to specify a map target and other properties.
Mandatory properties to be specified in the New Simple Map 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 |
| **Module** | The SNOMED CT module that contains this Reference Set member (primary module by default) |
{% hint style="info" %}
When adding multiple members at the same time, all will receive the same map target value specified in the Add New Member Wizard.
{% endhint %}
### Simple Map type with Description Reference Set
This Reference Set type is a Simple Map type Reference Set, where the Map target description is also displayed.
To create a new Reference Set, right-click on the Simple map grouping concept in the Reference Set View and select *New simple map with description reference set...*
Members can be added the same way as to a Simple type Reference Set.
---
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