> For the complete documentation index, see [llms.txt](https://help.arkance-systems.com/class-feeder/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.arkance-systems.com/class-feeder/eng/manual/element-classification/facet-selection.md).

# Facet Selection

The active facet can be selected form the drop-down menu. CCI classification consists of these facets:

* Construction entities
* Spaces
* Functional systems
* Technical systems
* Components

Classification tables are displayed according to selected facet. Element categories are also filtered based on the selected facet (some elements are not elegible to be classified by some facets).

<figure><img src="https://4055977359-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FEH7axMwLIU8mR7mhmEm0%2Fuploads%2FxoEnQA98LZVWW6fYcP5I%2Finterface_CF_select_facet.png?alt=media&amp;token=d23a654a-6536-42a5-998e-e1aefb14516a" alt=""><figcaption><p>Facet selection</p></figcaption></figure>