[xsl] is ID definition in DTD necessday for id()

["Steve Renshaw" <renshaw_steve@xxxxxxxxxxx>]

Quick questions -is it needed to use a dtd definition in the XML source


<!DOCTYPE root [
...
<!ELEMENT item (#PCDATA)>
<!ATTLIST item id ID #REQUIRED>
...
]>

in order for id() to match an element with @id attribute? Do some processor 
just look for the existnace of @id or is an ID definiton needed? Do some 
processors treat this differently (whicyh and how?

final question -what id "id()" called - it isn't a function or is it?
It acts more like text() or comment(). thanxks

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

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