Xalan date extension problem - xslt

Question

i'm trying to use the ubuntu cli version of xalan:
Xalan version 1.10.0
Xerces version 2.8.0
My problem is how to kick in with date functions. I tryed like this:
<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet version="1.0"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:date="http://exslt.org/dates-and-times" extension-element-prefixes="date">
<xsl:import href="date/date.xsl" />
<xsl:output method="text" indent="yes" />
date: <xsl:value-of select="date:date()" />
</xsl:stylesheet>
It gives me back this message:
XSLException Type is: XalanXPathException
Message is: The function number 'http://exslt.org/dates-and-times:date' is not available. (file:///home/user/test.xsl, line x, column y)
What files or what do i need to change to make those date functions work?

Answer 1

You need to use a later version of Xalan.
From the Xalan J.2.7.1 documentation:
EXSLT extensions
Xalan-Java supports the EXSLT
initiative to provide a set of
standard extension functions and
elements to XSLT users. Xalan-Java
includes implementations for the
following EXSLT extension modules:
EXSLT common functions EXSLT math
functions EXSLT set functions
EXSLT date-and-time functions
EXSLT dynamic functions
EXSLT string functions
The EXSLT func:function and
func:result elements (see EXSLT -
func:function)

Answer 2

The documentation shows that it has built-in beta implementations for that subset, however it does not say you cannot import and use the functions from exslt.org. Why can't you? Does Xalan-c++ not support importing functions?
Note that, I was able to get the templates working. Just not the functions.

Answer 3

From http://xml.apache.org/xalan-c/extensionslib.html
Xalan-C++ includes beta
implementations for functions in four
of the EXSLT namespaces (some are
calls to extension already in the
Xalan namespace).
And from http://xml.apache.org/xalan-c/apiDocs/XalanEXSLTDateTimeImpl_8hpp.html, it looks like only date:date-time() have been implemented.