Re: [relax-ng] Mixed and compact syntax

[Eric van der Vlist <vdv@dyomedea.com>]

On Fri, 2002-07-05 at 20:54, John Cowan wrote:
> Eric van der Vlist scripsit:
> 
> > I find this very confusing for especially for "mixed{foo, bar}". People
> > would probably expect this to mean "mixed content with ordered foo and
> > bar" rather than a "group of foo and bar with any text node before or
> > after the group"!
> 
> To me, at least, those two expressions (in quotation marks) sound
> exactly synonymous.  Could you attempt to explain what you take the
> difference to be?

Sure... To me, text & (foo, bar) means in XML syntax (sorry but I am
still more familiar with the XML syntax):

<interleave>
 <text/>
 <group>
  <ref name="foo"/>
  <ref name="bar"/>
 </group>
</interleave>

ie, something not quite natural which if named patterns "foo" and "bar"
match empty elements "foo" and "bar" would validate:

"leading text
<foo/>
<bar/>
trailing text"

but not 

"leading text
<foo/>
text
<bar/>
trailing text"

The "natural" ordered mixed content (compatible with the WXS definition
of mixed content) would also validate this latest example and be
represented in XML by:

<group>
 <text/>
 <ref name="foo"/>
 <text/>
 <ref name="bar"/>
 <text/>
</group>

Have I missed something ?
 
> > Makes me think that I have a more general question about the rules to
> > read things such as: "p1, p2 | p3 & p4"... Are these allowed and how do
> > they read?
> 
> They are not allowed.

Goooood!

> BTW, in your RNG book (for which three cheers!) which are you going to
> present as the primary syntax, compact or XML?

The very first example [1] uses XML, the compact syntax is presented in
the next chapter [3] and I try to include both the XML and the compact
syntax for all the examples after this point in the book.

[1] http://books.xmlschemata.org/relaxng/RngBookFirstSchema.html
[2] http://books.xmlschemata.org/relaxng/RngBookNonXmlSyntax.html

Thanks

Eric
> -- 
> John Cowan                              <jcowan@reutershealth.com>
> http://www.ccil.org/~cowan              http://www.reutershealth.com
> Common Gaelic in Cyrillic script!
>         http://groups.yahoo.com/group/Celticonlang
> 
> 
-- 
See you in San Diego.
                               http://conferences.oreillynet.com/os2002/
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Eric van der Vlist       http://xmlfr.org            http://dyomedea.com
(W3C) XML Schema ISBN:0-596-00252-1 http://oreilly.com/catalog/xmlschema
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