More on XPath/Ptr and Information Set

http://www.w3.org/TR/NOTE-xptr-req

A: Completeness requirements
   ..
    1. XPointers must identify XML information objects, rather than
       necessarily their expressions in the raw XML syntax of a given
       file.
       For example, an XPointer can identify an element but not a tag,
       and (potentially) an attribute; but not the equal-sign or
       quotations that expressed it.

http://www.w3.org/TR/NOTE-xptr-infoset-liaison

B: Robustness requirements

    1. The same structure must be generated regardless of whether the
       parser was WF or validating.
       
    

_________________________________________________________
Joseph Reagle Jr.   
Policy Analyst           mailto:reagle@w3.org
XML-Signature Co-Chair   http://w3.org/People/Reagle/