> 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/content-type-reference-sets/simple-type-reference-sets.md).

# Simple type Reference Sets

The Simple type Reference Set serves a specified purpose for which a set of components can be specified for inclusion or exclusion. 

This type of Reference Set represents an extensional definition of a subset of SNOMED CT components, therefore it can be used to fully enumerate a subset of concepts, descriptions, or relationships.

In Snow Owl you can choose from the following referenced component types:

* SNOMED CT Concept
* SNOMED CT Description

To create a new Simple type Reference Set, right-click on the Simple type Reference Set navigational node and select the ![](/files/NJXu8joZmS4XeoLuEsrS) *New Simple type reference set...* Context Menu option.

### **Adding members**

* Drag and Drop concept from the SNOMED CT Navigator
* Use the SNOMED CT Navigator Context Menu options
  * ![](/files/-MWOT51skjgULsVA-ius) *Add concept(s) to the active reference set > Concept only*
  * ![](/files/-MWOT51skjgULsVA-ius) *Add concept(s) to the active reference set > Concept descendants only*
  * ![](/files/-MWOT51skjgULsVA-ius) *Add concept(s) to the active reference set > Concept and descendants*
* Use the Search View Context Menu options
  * ![](/files/-MWOT51skjgULsVA-ius) *Add concept to the active reference set*
  * ![](/files/-MWOT51skjgULsVA-ius) *Add all results to the active reference set*
* Use the Reference Set Editor's New SNOMED CT Reference Set Member Wizard through
  * ![](/files/-MWOT51skjgULsVA-ius) *Add new reference set member*

{% hint style="info" %}
These options are only enabled when a Reference Sets Editor is open and activated.
{% endhint %}

The new members will be automatically added when using one of these methods.

{% hint style="warning" %}
If a referenced component is already present in the Simple type Reference Set, a warning appears and the member will not be added again.
{% endhint %}

#### Reference Set Member Module

{% hint style="info" %}
New members will be added using the module that is currently specified in the SNOMED CT Settings.
{% endhint %}

To modify the module of a Reference Set member, click on the member that you would like to change, press the ![](/files/-Mb6hH4wQ---kG6oI5v9) and select the desired module.

{% hint style="warning" %}
Make sure you have the Module ID property enabled in the SNOMED CT Reference Set Editor [Preferences](/snow-owl-authoring-platform/reference-sets/reference-set-editor/preferences.md).
{% endhint %}

If you add a new member using the New SNOMED CT Reference Set Member Wizard, you can immediately specify the module in the wizard.


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