> 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/filtering-operators/exists-not-exists-filter.md).

# EXISTS/NOT\_EXISTS filter

In the context of a graph query, the `EXISTS` filter tests the existence of a relationship with another entity. This is the only filter that is explicitly limited to filtering on an entity located directly under the filtered node. To specify which relation should exist/not exist, the filter has a `target` key.

You can also pass a parameter to the EXISTS filter. This parameter is used as a secondary filtering element. To query the assets with an attribute of type `Description`,  use the EXISTS filter on the asset with target value `Attribute` and also the Id of the `Description` type in the `value` key of the filter.

The table below lists the possible target values and the expected value type for optional parameters.

| Filtered Entity          | Target value             | Optional Parameter | Description                                                                                                                                 |
| ------------------------ | ------------------------ | ------------------ | ------------------------------------------------------------------------------------------------------------------------------------------- |
| Community, Domain, Asset | Member                   | Role Id            | Filter resources related/not related to a responsibility. Optionally, only responsibilities related to the Role Id.                         |
| Asset                    | Relation                 | RelationType Id    | Filter assets that are/are not the source or target of a relation. Optionally, only relations related to the RelationType Id.               |
| Asset                    | RelationSource           | RelationType Id    | Filter assets that are/are not the "source " of a relation. Optionally, only relations related to the RelationType Id.                      |
| Asset                    | RelationTarget           | RelationType Id    | Filter assets that are/are not " target" of a relation. Optionally, only relations related to the RelationType Id.                          |
| Asset                    | Attribute                | AttributeType Id   | Filter assets that have/do not have an attribute. Optionally, only attributes related to the AttributeType Id.                              |
| Asset                    | StringAttribute          | AttributeType Id   | Filter assets that have/do not have a StringAttribute. Optionally, only StringAttributes related to the AttributeType Id.                   |
| Asset                    | SingleValueListAttribute | AttributeType Id   | Filter assets that have/do not have a SingleValueListAttribute. Optionally, only SingleValueListAttributes related to the AttributeType Id. |
| Asset                    | MultiValueListAttribute  | AttributeType Id   | Filter assets that have/do not have a MultiValueListAttribute. Optionally, only MultiValueListAttribute related to the AttributeType Id.    |
| Asset                    | BooleanAttribute         | AttributeType Id   | Filter assets that have/do not have a BooleanAttribute. Optionally, only BooleanAttributes related to the AttributeType Id.                 |
| Asset                    | NumericAttribute         | AttributeType Id   | Filter assets that have/do not have a NumericAttribute. Optionally, NumericAttributes related to the AttributeType Id.                      |
| Asset                    | DateTimeAttribute        | AttributeType Id   | Filter assets that have/do not have a DateTimeAttribute. Optionally, only DateTimeAttributes related to the AttributeType Id.               |

{% hint style="info" %}
The EXISTS/NOT\_EXISTS filters are exclusively for communities, domains and assets.
{% endhint %}


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