Thank you for your contribution to eXist-db! 

To help the community judge your pull request (PR), please include the following:

- A (short) description of the content of changes.
- A context reference to a [Github Issue](https://github.com/eXist-db/exist/issues), a message in the [eXist-open mailinglist](http://exist-open.markmail.org), or a [specification](https://www.w3.org/TR/xquery-31/).
- Tests. The [XQSuite - Annotation-based Test Framework for XQuery](http://exist-db.org/exist/apps/doc/xqsuite.xml) makes it very easy for you to create tests. These tests can be executed from the [eXide editor](http://exist-db.org/exist/apps/eXide/index.html) via XQuery > Run as Test.

Your PR will be tested using [GitHub Actions](https://github.com/eXist-db/exist/actions) against a number of operating systems and environments. The build status is visible in the PR. 

To detect errors in your PR before submitting it, please run eXist's full test suite on your own system via `mvn -V clean verify`.

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### Description:

### Reference:

### Type of tests: