EXSLT func:function not registered for XSLT filter module

[Kate F]

Hi,

I'm trying to use EXSLT's <func:function> with nginx's xslt filter
module. The effect I think I'm seeing is that my functions are
seemingly ignored.

I made a test XSLT stylesheet:

    iona% cat xsl/fish.xsl
    <?xml version="1.0"?>

    <xsl:stylesheet version="1.0"
        xmlns="http://www.w3.org/1999/xhtml"
        xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
        xmlns:x="http://xml.elide.org/fish"
         xmlns:func="http://exslt.org/functions"

        extension-element-prefixes="func">

        <func:function name="x:fish">
            <func:result select="123"/>
        </func:function>

        <xsl:output method="text" encoding="utf-8"
            media-type="plain/text"/>

        <xsl:template match="/">
            <xsl:value-of select="x:fish()"/>
            <xsl:text>
</xsl:text>
        </xsl:template>

    </xsl:stylesheet>

    iona% xsltproc xsl/fish.xsl vhost/blog.libfsm.org/index.xhtml5
    123
    iona%

I would expect my <xsl:value-of select="x:fish()"/> there to give the
same result as under xsltproc. But running the same under nginx gives:

    xmlXPathCompOpEval: function fish not found
    XPath error : Unregistered function
    xmlXPathCompiledEval: evaluation failed
    runtime error: file /home/kate/svn/www/xsl/fish.xsl line 19 element value-of
    XPath evaluation returned no result.

Looking at ngx_http_xslt_filter_module.c I see exsltRegisterAll() is
called, which is what should register libexslt's handler for
func:function and friends:

    #if (NGX_HAVE_EXSLT)
        exsltRegisterAll();
    #endif

I know NGX_HAVE_EXSLT is defined because other EXSLT functions (such
as things in the date: and str: namespaces) work fine.

I'm using nginx 1.4.1, which is linked to the same libexslt as my xsltproc.

Any suggestions, please?

--
Kate