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[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Why the Infoset?
John Cowan wrote:
> Jonathan Borden wrote:
>
> > But it is not hard to describe, that is my point. The XML 1.0 production
> > rules create a parse tree which exactly describes the source document,
down
> > to the byte. This is what I would call the XML property set, and from
this
> > one can subset to one's desire.
>
> Okay, I understand now. Actually the production-rule level is *not* the
> bottom parsing level, because for the most part PE-references have already
> been removed.
I new there was a reason why you got this job :-)
PE-Reference is production [69] so it can be represented in a production
rule tree, the issue is that the elementDecl tree cannot be built until the
PE-Reference is expanded.
I would handle this as an <alt> with both the PE-Reference and following
character content, and its expanded form side by side.
e.g.
<PEDecl p="72">
<seq>
<S><c char=" "/></S>
<Name>element</Name>
<S><c char=" "/></S>
<EntityDef><string value="<!ELEMENT" /></EntityDef>
</seq>
</PEDecl>
and
<alt>
<seq>
<PEReference><Name>element</Name></PEReference>
<S char=" "/><string value="FOO EMPTY>" />
</seq>
<elementDecl>
<seq>
<S/>
<Name>FOO</Name>
<S/>
<contentSpec>EMPTY</contentSpec>
</seq>
</elementDecl>
</alt>
> Internal PEs are not really structural in XML;
> it is a mere validity constraint that requires DTD constructs to begin
> and end in the same PE, and
>
> <!ENTITY % element "<!ELEMENT">
> %element; FOO EMPTY>
>
> is a well-formed though not valid external subset.
>
> > Doesn't it make the most sense to subset from the full description,
rather
> > than both add to and subtract from a partial description?
>
> The question then remains, just what is
> useful structure and what is not? I have done my best to answer that
> question.
Useful for the DOM and XPath, I agree, but since these already exist, and
define the middle subset, now is the time to define the full set.
I have no problem with what the Infoset is trying to accomplish as a subset
of XML 1.0 + Names (just as I have no problem with what Common XML etc are
trying to accomplish), but this activity needs to come from a complete base
down to X,Y or Z subset each of which are useful.
Jonathan Borden
The Open Healthcare Group
http://www.openhealth.org
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