> 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/introduction/the-output-module-query-language.md).

# The Output Module 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:

![Example of Business Term tree graph in Collibra Output Module](/files/fOkls7TB5LLXi0c1VT7s)

{% hint style="info" %}

* The graph is a single-rooted tree graph.
* Multiple root nodes are not allowed.
* Each node has one parent.
* For each of the selected properties, you must specify a unique alias within the graph query.
* Filtering is specified on the node you want to filter and can reference any property of the current node or a child or grandchildren. The example above shows assets filtered by their related AssetType name.
  {% endhint %}


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