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Re: Mixed content in data-binding (Was: Re: Interest

• To: "Michael Kay" <mike@s...>,"'Peter Gerstbach'" <peter.gerstbach@g...>,"'XML-dev'" <xml-dev@l...>
• Subject: Re: Mixed content in data-binding (Was: Re: Interesting pair of comments
• From: "Pete Cordell" <petexmldev@t...>
• Date: Fri, 15 Jul 2005 10:26:56 +0100
• References: <E1DtLf0-0001Ed-00@p...>

Original Message From: "Michael Kay"
> There are also applications of mixed content that don't fall into the
> classic "marked-up text" model. For example, it can be used to record
> "properties of properties", as in
>
> <email>fred@s...<last-modified>2005-02-02</last-modified></email>
...
> But it's an area where the XML Schema spec didn't carry through its design
> principle that elements should be able to do anything that attributes can
> do: if last-modified were an attribute then I could constrain the email
> address with a pattern facet.
...
> Michael Kay
> http://www.saxonica.com/

Thanks for the example Michael.  As I think you infer, XSD itself doesn't 
really support this either.  For example, if <email> was marked as mixed, 
the following would also be legal wouldn't it?:

<email>fred@s...<last-modified>2005-02-02</last-modified>What's 
this?</email>

Also, it is only implied, perhaps through documentation, that the first 
CDATA event is the actual e-mail address value.  To capture it precisely, an 
(abridged) schema would have to look something like:

<xs:element name=email><xs:ct>
    <xs:sequence>
        <xs:CDATA identifyingName=email><!-- new construct -->
        <xs:element name=last-modified ...
...

That said, I do find what you suggest aesthetically pleasing and I agree 
that tools could do better here!

Pete.
--
=============================================
Pete Cordell
Tech-Know-Ware Ltd
                         for XML to C++ data binding visit
                         http://www.tech-know-ware.com/lmx
                         (or http://www.xml2cpp.com)
=============================================

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