I thought it was necessary initially, but the following xml and xsl display 
"Hello World" in IE6 whether the doctype in included or not.
Am I msising something ehre?

doit.xml
=========
<?xml version="1.0"?> 
<!DOCTYPE root [
<!ELEMENT root (item)> 
<!ELEMENT item (#PCDATA)> 
<!ATTLIST item id ID #REQUIRED> 
]> 
<?xml-stylesheet type="text/xsl" href="doit.xsl"?> 
<root> <item id="x123">Hello World</item></root>

doit.xsl
=========
<?xml version="1.0"?> 
<xsl:stylesheet version="1.0" 
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> 

<xsl:template match="id('x123')"> 
      <xsl:value-of select="."/> 
   </xsl:template> 

</xsl:stylesheet> 

> From: David Carlisle <davidc@[...].uk>
> Reply-To: xsl-list@[...].com
> To: xsl-list@[...].com
> Subject: Re: [xsl] is ID definition in DTD necessday for id()
> Date: Thu, 20 Dec 2001 17:28:36 GMT
> 
>  > Quick questions -is it needed to use a dtd definition in the XML
>  > source
> 
> yes, the attribute does not need to be called id the only thing that
> matters is that it has been declared as type ID in a dtd.
> 
>  > - it isn't a function or is it?
> It's a function, it takes a string valued argument and returns a node
> set.
> 
> David
> 
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