SAXONICA

Saxon Documentation
Full Contents
About Saxon
Changes in this Release
Notices
Using XSLT 2.0
Using XQuery
Handling Source Documents
XML Schema Processing
XPath API for Java
Saxon on .NET
Extensibility
Saxon Extensions
| Introduction
| EXSLT Extensions
» | Extension attributes (XSLT only)
| Additional serialization parameters
| Extension functions
| Extension instructions
Sample Saxon Applications
The Saxon SQL Extension
XSLT Elements
XPath 2.0 Expression Syntax
Function Library
Standards Conformance

# saxon:memo-function

This attribute may be set on the `xsl:function` element. The permitted values are "yes" and "no". Specifying "yes" indicates that Saxon should remember the results of calling the function in a cache, and if the function is called again with the same arguments, the result is retrieved from the cache rather than being recalculated. Don't use this if the function has side-effects (for example, if it calls `saxon:assign`, or an extension function with side-effects). Don't use it if the function accesses context information such as the context node or `position()` or `last()`. And be careful if the function constructs and returns a temporary tree: the effect will be that the function returns the same tree each time, rather than a copy of the tree (this difference will only show up if you compare the identity of nodes in the two trees).

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