[Bug 5297] Drop restriction of assertions to down-pointing XPaths?

http://www.w3.org/Bugs/Public/show_bug.cgi?id=5297





------- Comment #5 from cmsmcq@w3.org  2007-12-07 18:42 -------
Comment #3 asks for clarification of the issue, but I cannot provide the
desired
clarification because I do not understand the question.

The Working Group has entertained several different formulations of the spec
intended to achieve the goal of ensuring that neither assertions nor
conditional
type assignment depend on nodes outside the subtree rooted in the item to which
the assertions or conditional type assignment are attached by declaration.  In
some of those formulations, specific XPath axes have been made illegal in the
XPath expressions.  In others, the input tree has been truncated so that any
expression which attempts to refer to nodes outside the subtree will evaluate
to the empty set.  Other formulations are possible which involve neither 
syntactic restrictions on XPath expressions nor tree surgery.  The details of
the spec prose are not of interest here; what is at issue is the goal the
WG has been trying to achieve, which the description of the issue argues 
should be revisited.  If the goal is dropped, then I think the implications 
for the spec prose are obvious enough.

Received on Friday, 7 December 2007 18:43:40 UTC