[XML-DEV Mailing List Archive Home]
[By Thread]
[By Date]
Re: [xml-dev] Mixed content in data-binding (Was: Re: [xml-dev] Interesting pair of comments
- To: "Michael Kay" <mike@...>,"'Peter Gerstbach'" <peter.gerstbach@...>,"'XML-dev'" <xml-dev@...>
- Subject: Re: [xml-dev] Mixed content in data-binding (Was: Re: [xml-dev] Interesting pair of comments
- From: "Pete Cordell" <petexmldev@...>
- Date: Fri, 15 Jul 2005 10:26:56 +0100
- References: <E1DtLf0-0001Ed-00@...>
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@...<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@...<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)
=============================================
|
