Unable to resolve prefix 'xalan'

[ch...@coherity.com]

I need some help in using xalan-c. I compiled xerces (1.6) and xalan 
(1.3) on both Linux (RedHat 7.2) and Solaris 2.6, the build processes 
were okay, but when I try to run the samples (both testXSLT and Xalan):

testXSLT -IN aInXml.xml -XSL aSSheet.xsl    -- or --  Xalan aInXml.xml 
aSSheet.xsl
(where in aSSheet.xsl, I use the Xalan extension function 
"xalan:nodeset()" in a select="..." attribute)

I got the error below:

XSLException Type is: XPathParserException
Message is: Unable to resolve prefix 'xalan'.

I tried to run testXSLT by adding the option -EN 
http://xml.apache.org/xalan and also tried to put the namespace attribute 
xmlns:xalan="http://xml.apache.org/xalan" into the <xsl:stylesheet> tag, 
and it still has the same problem.

The exact same input xml and xsl stylesheet works perfectly fine with 
xalan-c 1.2 (but I need 1.3 for another application to build and run 
correctly)

Does anyone know what was wrong with my xalan-c 1.3 build? Any help and 
pointer would be appreciated.

Thanks!

Chen