http://www.w3.org/Bugs/Public/show_bug.cgi?id=5023 Noah Mendelsohn <noah_mendelsohn@us.ibm.com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |noah_mendelsohn@us.ibm.com --- Comment #10 from Noah Mendelsohn <noah_mendelsohn@us.ibm.com> 2009-04-15 15:00:27 --- Michael Kay writes: > using a specialized mechanism such as identity > constraints rather than a general mechanism like > assertions may result in a more focused and > intelligible error message when the condition is > violated. Yes, indeed. Perhaps the TAG finding Rule of Least Power (http://www.w3.org/2001/tag/doc/leastPower.html) is pertinent to consideration of these tradeoffs. > it's a lot easier for an implementation to enforce > identity constraints and CTA while processing the > document in a streaming manner than it is to > enforce assertions Sigh. I can't help remembering all the debates about whether insisting on a suitable subset of XPath would have made this less of a concern. Too late to reopen that, but I do find it disappointing to find out that after all, you as a skilled implementer wind up warning users away from assertions exactly because of this foreseeable concern. That doesn't make the tradeoff we chose wrong, but I remain somewhat uncomfortable with it. Noah -- Configure bugmail: http://www.w3.org/Bugs/Public/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are the QA contact for the bug.Received on Wednesday, 15 April 2009 15:00:44 GMT
This archive was generated by hypermail 2.2.0+W3C-0.50 : Sunday, 6 December 2009 18:13:17 GMT