Re: Simple subtree() function for Xpath transform and c14n

At 13:17 2000-06-07 -0700, John Boyer wrote:
 >This trivially solves all of the problems.  For example, the barename
 >xpointer given by URI="#E" could be represented by the expression
 >
 >subtree(id("E"))

I think it is a useful proposal. 

However, to this point of URI="#E", we don't control the definition of
XPtr's Bare Name. Consequently, the text in [1] will have to be changed. I
may be wrong (I hope so), but I expect this means that References to XML
fragments of the type URI="#NAME" will be quite useless. Also means we might
have to add the "clean-URI" text [2] that used to be associated with the
IDREFs...

[1] http://www.w3.org/TR/2000/WD-xmldsig-core-20000601/#sec-Reference
[URI] permits identifiers that specify a fragment identifier via a
separating number/pound symbol '#'. (The meaning of the fragment is defined
by the resource's MIME type). XML Signature applications MUST support the
XPointer 'bare name' [Xptr] shortcut after '#' so as to identify IDs within
XML documents. 

[2] http://www.w3.org/TR/2000/WD-xmldsig-core-20000104/#sec-ObjectReference
URI/IDREF only permits a 'clean' URI or IDREF; fragment identification is
specified under Transforms. This choice permits References to identify a
fragment of a document that is encoded: the Reference identifies the
resource, the first Transform specifies decoding, the second Transform
specifies the fragment. 

_________________________________________________________
Joseph Reagle Jr.   
W3C Policy Analyst                mailto:reagle@w3.org
IETF/W3C XML-Signature Co-Chair   http://www.w3.org/People/Reagle/