Orbeon Forms uses XPath 2.0 as expression language.

This page and sub-pages describe XPath usage and the Orbeon Forms XPath function library. The documentation is split into:

• ​Type annotations​

• ​Tips​

• ​Compatibility​

• ​Standard Functions​

• ​Maps and arrays Functions​

• Extension Functions

  • ​Core functions​

  • ​Utility functions​

  • ​Model functions​

  • ​Validation functions​

  • ​Controls functions​

  • ​XML functions​

  • ​JSON functions​

  • ​HTTP functions​

  • ​Form Runner functions​

  • ​Other functions​

  • ​Deprecated functions​