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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: "Andrew Layman" <andrewl@m...>
• Date: Fri, 15 Jul 2005 08:06:53 -0700
• Thread-index: AcWJErDiNq0FMujRQwCA9TMSDin/sgAAuXugAA2zC7A=
• Thread-topic: Mixed content in data-binding (Was: Re: Interesting pair of comments

Michael Kay wrote


> 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></emai
l>

To make this fully supported by schemas, one would need a way to
indicate in schema rules for the cardinality, etc., of the "properties
of properties."

But there is also a versioning issue. Since adding such meta-data as the
last-modified date after the fact is a typical usage, attributes today
allow such annotation with less disruption to existing readers.  E.g. 

<email last-modified='2005-02-02'>fred@s...</email>

But this only works to one level.  One cannot add an attribute to that
attribute.

One could imagine a future version of XML that treated elements and
attributes with more parallelism, and allowed attributes to have
structure, perhaps with an element-like syntax, as in:

<email>fred@s...<@last-modified>2005-02-02</@last-modified></em
ail>

And

<email>fred@s...<@last-modified>2005-02-02<@says-who>Joe</@says
-who></@last-modified></email>

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  • Re: Mixed content in data-binding (Was: Re: Interesting pair of comments
    • From: Peter Hunsberger <peter.hunsberger@g...>

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