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https://issues.apache.org/jira/browse/XALANJ-2431?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12566681#action_12566681
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Henry Zongaro commented on XALANJ-2431:
---------------------------------------

That namespace is only the standard function namespace in XSLT 2.0 and XPath 
2.0.  The Xalan-J processors are XSLT 1.0 processors, and according to section 
14.2 of XSLT 1.0:

    If a FunctionName in a FunctionCall expression is not an NCName (i.e. if it 
contains a colon), then it is
    treated as a call to an extension function.

So the Xalan-J processors have no choice but to treat a reference like 
fn:position() as a reference to an extension function.

> Xalan can not regconigze the default namespace if users explicitly define in 
> XSLT documents
> -------------------------------------------------------------------------------------------
>
>                 Key: XALANJ-2431
>                 URL: https://issues.apache.org/jira/browse/XALANJ-2431
>             Project: XalanJ2
>          Issue Type: Bug
>          Components: Xalan
>    Affects Versions: 2.7.1
>            Reporter: lqv
>             Fix For: 2.7.1
>
>
> <?xml version="1.0" encoding="UTF-8"?>
> <xsl:stylesheet version="2.0" 
> xmlns:xsl="http://www.w3.org/1999/XSL/Transform"; 
> xmlns:xs="http://www.w3.org/2001/XMLSchema"; 
> xmlns:fn="http://www.w3.org/2005/xpath-functions";>
>       <xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>
> </xsl:stylesheet>
> When user define prefix xmlns:fn="http://www.w3.org/2005/xpath-functions";, 
> Xalan does not understand it is default namespace. 
> Therefore, it considers this namespace is extension function ==> load class 
> which has name: "xpath-functions" which does not exist ==>
> throw exception "ClassNotFound". 
> Expected result: should check if the namespace is default namespace before 
> considers it is extension namespace.

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