15646 2012-01-20 17:40:48 +0000 Definitions of \i and \c in regular expressions 2012-01-20 17:49:28 +0000 1 1 1 Unclassified XML Schema Datatypes: XSD Part 2 1.0 only PC Windows NT NEW P2 normal --- 11421 11765 1 cmsmcq David_E3 cmsmcq mike www-xml-schema-comments oldest_to_newest 62943 0 cmsmcq 2012-01-20 17:40:48 +0000 +++ This bug was initially created as a clone of Bug #11421 +++ +++ Bug 11421 relates to XSD 1.1, this bug to XSD 1.0 +++ The definition of \c is straightforward enough: the set of name characters, those matched by NameChar where NameChar is a link to a production in the XML 1.1 specification. The definition of \i by contrast is rather strange: the set of initial name characters, those matched by NameStartChar in [XML] or by Letter | '_' | ':' in [XML 1.0] How are we to read this? I don't think "or" here means "the union of these two sets of characters"; I think it means use one definition if you're using XML 1.0, a different definition if you are using XML 1.1. But why doesn't it use NameStartChar in both cases? What seems to have happened is that in XML 1.0 ed 4 and earlier, names were defined to start with (Letter | '_' | ':'), but in XML 1.0 ed 5, they are defined to start with NameStartChar (which is a larger set of characters). So we have chosen a definition that fixes \i to the pre-5th-edition of XML names, while moving \c forward to the definition used in 1.0ed5 and 1.1. This can't be right. I would suggest aligning both character classes with the definitions of XML names as they appear in XML 1.0 ed 5 and XML 1.1. 62946 1 cmsmcq 2012-01-20 17:48:31 +0000 *** Bug 11765 has been marked as a duplicate of this bug. ***