Re: New FAQ: entities and NCRs

On Monday, July 4, 2005, 5:00:15 AM, Felix wrote:


FS> Thanks for the rewording, that's much better! Just an inline comment
FS> below.


>> FS>  but I would like to express that character entities rely
>> FS>  on the XML DTD mechanism for general entities,
>> FS>  which is e.g. not available in RELAX NG.
>>
>> The DTD mechanism is unaffected by the use of RelaxNG or W3C XML Schema
>> validation.
>>

FS> It is unaffected, but I wanted to make a different point: If people
FS> define their markup language with RelaxNG, they need the DTD
FS> mechanism in addition.

If they want to use entities.

FS>  Not only the external DTD subset, but also
FS> the internal DTD subset for character entity declaration might be
FS> applicable if you use ONLY an RelaxNG processor.

I don't follow. Can you give an example of how one might use a RelaxNG
processor without using an XML parser?

FS> You'll need an XML DTD processor which expands the entity references
FS> before RelaxNG validation.

Parsing XML requires an XML parser, which is required to expand entities
defined in the internal DTD subset. The infoset thus produced may then be
passed to a RelaxNG processor. There is no such thing as an "XML DTD
processor" separate from an XML parser.

Perhaps you are confusing  parsing and DTD validation?



-- 
 Chris Lilley                    mailto:chris@w3.org
 Chair, W3C SVG Working Group
 W3C Graphics Activity Lead