URIs in XML canonical forms

[Richard Tobin]

Sun's definition of "second XML canonical form" in the Oasis
conformance tests refers to the "shortest such relative URI".  Is that
shortest in terms of characters?  Or bytes?  Is it measured before or
after escaping non-ascii characters?  Is it meant that include the use
of ".."?  If so, then determing the shortest URI is somewhat
non-obvious.  For example, if the input document is

  http://sun.com/a/b/c/doc.xml

and it refers to

  http://sun.com/a/b/z

then the shortest relative URI is "../z", but if the input
document is

  http://sun.com/a/b/c/d/doc.xml

then the shortest relative URI is "/a/b/z" (rather than "../../z")

-- Richard

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