> On 01 Aug 2016, at 10:15, William Lupton <[email protected]> wrote: > > But the errata at https://www.w3.org/XML/xml-V10-5e-errata say the following. > There are also related changes to Section 2.6 (processing instructions) and > Section 3 (logical structures). W. > Section 2.3 Common Syntactic Constructs > Delete the following paragraph: > > Names beginning with the string "xml", or with any string which would match > (('X'|'x') ('M'|'m') ('L'|'l')), are reserved for standardization in this or > future versions of this specification.
Good catch! What this erratum means for YANG is that only "xml" prefix needs to be forbidden. If it is still possible, it would IMO make a good sense to remove that comment from the ABNF in 6020bis, and make this change in sec. 7.1.4: OLD A prefix is an identifier (see Section 6.2). NEW A prefix is an identifier (see Section 6.2), and it MUST NOT be the string "xml". Lada > >> On 1 Aug 2016, at 04:22, Andy Bierman <[email protected]> wrote: >> >> >> OK -- sorry -- must have read it wrong >> >> >> Andy >> >> >> >> On Sun, Jul 31, 2016 at 6:57 PM, Dale R. Worley <[email protected]> wrote: >> Andy Bierman <[email protected]> writes: >> > The YANG 1.1 ABNF says: >> > >> > ;; An identifier MUST NOT start with (('X'|'x') ('M'|'m') ('L'|'l')) >> > identifier = (ALPHA / "_") >> > *(ALPHA / DIGIT / "_" / "-" / ".") >> > >> > >> > There is no explanation given why. >> > The same restriction was copied to RESTCONF, also without explanation. >> > Supposedly, XML does not allow identifiers to start with XML. >> > >> > Looks like this restriction only applies to the PITarget [17], not Name [5] >> > https://www.w3.org/TR/REC-xml/#sec-pi >> > >> > We have been applying this restriction to element names >> > but it only applies to processing instructions. >> > >> > IMO it should be removed. >> > It confuses people when they get an error for naming a data node >> > with a string that matches. >> >> Eh? Looking at "Extensible Markup Lanuage (XML) 1.0 (Fifth Edition)", >> section 3.1 (http://www.w3.org/TR/xml/#sec-starttags) says that the >> element name of a start in end tag is a "Name". Looking at section 2.3 >> (http://www.w3.org/TR/xml/#sec-common-syn), I see >> >> Names beginning with the string "xml", or with any string which >> would match (('X'|'x') ('M'|'m') ('L'|'l')), are reserved for >> standardization in this or future versions of this specification. >> >> And since Yang data node names can appear as XML element names, Yang has >> to forbid node names that start with "XML". >> >> Dale >> >> _______________________________________________ >> netmod mailing list >> [email protected] >> https://www.ietf.org/mailman/listinfo/netmod > > _______________________________________________ > netmod mailing list > [email protected] > https://www.ietf.org/mailman/listinfo/netmod -- Ladislav Lhotka, CZ.NIC Labs PGP Key ID: E74E8C0C _______________________________________________ netmod mailing list [email protected] https://www.ietf.org/mailman/listinfo/netmod
