[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: The subsetting has begun
From: "Joe English" <jenglish@f...> > Rick Jelliffe wrote: > > > > SGML is more of a DAG, because of CONREF. Sharing branches > > is one thing XML gave up. > > Actually, that's not what CONREF does. > > The only significance of attributes with default value > CONREF is that at most one such attribute may be specified > in a start-tag, and if one is, the element is not allowed > to have any content. The significance of CONREF is in ISO 8879 "4.57 content reference (attribute): An impliable attribute whose value is referenced by the application to generate data content. NOTE: When an element has an explicit content reference, the element's content in the document instance must be empty." The plain name says it: a reference to content: hence the DAG connection. That it is the application's job to do the branch sharing is fine: it is the application's job to build and present the in-memory structure or stream in any case. > Attributes with REFID declared value and CONREF default > value are sometimes used to _encode_ DAGs, but that's purely > an application convention. CONREFness and REFIDhood aren't > even reflected in the ESIS. Well, that is something to take up with the designer of ESIS, I guess :-) Omnimark makes it trivial to assess whether some content is CONREFed, something like ELEMENT x ... OUTPUT REFERENT zz WHEN CONTENT IS CONREF ... Cheers Rick Jelliffe
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