> For the complete documentation index, see [llms.txt](https://developer.collibra.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.collibra.com/api/guides/knowledge-graph/understanding-the-query-language.md).

# Understanding the query language

The API model has a set of well-defined entities and relations that allow you to create a single-rooted tree graph query and specify constraints that must exist for any of the resulting nodes, such as results filtering.

For example, to query all assets of type Business Term and their respective domain and community, specify the following tree graph:

![graph](/files/fOkls7TB5LLXi0c1VT7s)