> You can parse an xml file with an xsl file

No, you parse an XML file with an XML parser, such as Xerces or xp

> and can generate 
> an html document using Xerces or XT.

Xerces is an XML parser, xt is an XSLT processor. XML parsers cannot
generate HTML; XSLT processors can.

> Then I wonder why these 
> people introduced Xalan. Please someone clarify me what are 
> the advantages having XSLT and Xalan?

XSLT processors (like xt and Xalan) transform an input XML structure to
a result XML structure, which they can then output as XML or HTML. This
is a much bigger job than simply parsing the XML.

Michael Kay
Software AG
home: Michael.H.Kay@xxxxxxxxxxxx
work: Michael.Kay@xxxxxxxxxxxxxx 


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