Create XPath function in XSLT 1.0

Question

I'm looking how to create my own XPath function in XSLT-1.0. For example I have simple XPath expression which I'm using again and again in my XSLT template. I want to create my own XPath function myOwnFunction($var) which calls XPath expression.

Example expression:

normalize-space(substring-after(substring-after($var, '-'), '-'))

Good question, +1. See my answer for explanation, particular example and a recommendation. :) — Dimitre Novatchev
– Dimitre Novatchev, Commented Mar 9, 2011 at 13:54
Thanks all for answers. XSLT 2.0 is nice to have for me, but I'm struct on 1.0 version in project I'm wokring on. — michal.kreuzman
– michal.kreuzman, Commented Mar 9, 2011 at 14:01
@Michal-Kreuzman: The last link in my answer was not showing -- now corrected. — Dimitre Novatchev
– Dimitre Novatchev, Commented Mar 9, 2011 at 14:22

Dimitre Novatchev · Accepted Answer · 2015-05-09 16:07:55Z

11

The previous two answers said it all: XSLT 1.0 does not provide the means to create functions that can be referenced from within an XPath expression.

If someone wants such functionality they should start using XSLT 2.0 (and make use of the standard <xsl:function> instruction), or:

Use the <func:function> extension element provided by EXSLT. Note that very few XSLT 1.0 processors implement this extension element.
Use a particular XSLT processor feature, if such exists. For the .NET platform one can use the XsltContext class, the IXsltContextFunction interface and techniques like this.

Anyway, all this is not at all XSLT programming, so my advice is to start using XSLT 2.0 seriously.

edited May 9, 2015 at 16:07

answered Mar 9, 2011 at 13:53

Dimitre Novatchev

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Flack · Accepted Answer · 2011-03-09 13:26:25Z

5

If you are stuck with 1.0, you can check if your processor supports EXSLT Functions.

answered Mar 9, 2011 at 13:26

Flack

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1 Comment

Mika Feiler Over a year ago

link dead, here's a working webarchive web.archive.org/web/20220107204028/http://exslt.org/func/…

Dark Falcon · Accepted Answer · 2011-03-09 13:17:45Z

4

XSLT 1.0 does not define this functionality. It was added in XSLT 2.0. You'll either have to use 2.0 or use some implementation-specific means to do this.

answered Mar 9, 2011 at 13:17

Dark Falcon

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