SubSpace and Metadata Integration
SubSpace Navigation for Confluence is integrated with Metadata for Confluence. Therefore, you can use the following functionality when both add-ons are installed on your Confluence.
When you add a CQL navigation element to the SubSpace Navigation, you can use Metadata sets and fields in your query (see section "Using Confluence Query Language (CQL) Syntax in Macros (Expert Filter Criteria)" of page Searching with Metadata in the Metadata for Confluence user guide).