- From: Dan Connolly <connolly@w3.org>
- Date: 2000年5月05日 08:44:04 -0500
- To: www-xml-schema-comments@w3.org, Steven Pemberton <steven.pemberton@cwi.nl>
- Message-ID: <3912D024.BBEA1401@w3.org>
Steven Pemberton wrote: > > The HTML WG has requested me to relay to you a request that XML Schemas > include a facility to define at least character entities (such as é). We tried that before, but it didn't work out well; we weren't sure we liked it, but we put the idea out for review, and the feedback was overwhelmingly negative: "The provision within XML Schema: Structures of a mechanism for defining parsed entities presents problems for the relationship between schema-validity and XML 1.0 well-formedness, since references to entities defined only in a schema are undefined from the XML 1.0 perspective. Strictly speaking, a well-formed XML document may contain references to undefined entities only if it is declared as standalone='no' and contains either an external subset or one or more references to external parameter entities in their internal subset. We get around this by [Definition: ] defining a nearly well-formed XML document to be one which either is well-formed per XML 1.0, or which fails to be well-formed only because of undefined general entity references, but which would be well-formed if it were standalone='no' and identified an external subset. We consider this justified on the grounds that the use of a namespace declaration which refers to a schema functions rather as an external subset, and from the XML 1.0 perspective such a reference almost of necessity renders the document non-standalone when schema-validation is applied." -- http://www.w3.org/1999/05/06-xmlschema-1/#conformance-schemaValidity If you can think of a less awkward way to do it, let us know. Otherwise, I think it's most likely that the WG will decline your request. If you find this explanation to be satisfactory justification for us to decline your request, please let us know by withdrawing your request. > While we recognise that the full entity mechanism might be a burden, HTML > markup typically contains a lot of character entities, and we would like to > be able to define them when using schemas without having to fall back to a > DTD subset. I'm afraid that's about the only way I can see to make it work. Another option is to use <eacute/> in stead of é, but that requires application-level support rather than being handled by the XML processor, and it won't work in attribute value literals. -- Dan Connolly, W3C http://www.w3.org/People/Connolly/
Received on Friday, 5 May 2000 10:05:12 UTC