# Extensibility

This page describes how to extend the capability of Saxon XSLT stylesheets and XQuery queries by adding extension functions and other user hooks.

The first two columns of the table below indicate which sections of this page are applicable to XSLT and which are applicable to XQuery. The next three columns indicate which Saxon editions the information applies to.

XSLT | XQuery | HE | PE | EE | Contents
§ | § | § | § | § | Integrated extension functions
§ | § |  | § | § | Reflexive extension functions (Java)
§ | § |  | § | § | Reflexive extension functions (.NET)
§ |  |  | § | § | Writing XSLT extension instructions
§ | § | § | § | § | Customizing serialization
§ | § | § | § | § | Implementing a collating sequence
§ | § | § | § | § | Implementing localized numbers and dates
§ | § | § | § | § | Writing a URI Resolver for input files
§ |  | § | § | § | Writing a URI Resolver for output files

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