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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: "Andrew Layman" <andrewl@...>
- Date: Fri, 15 Jul 2005 08:06:53 -0700
- Thread-index: AcWJErDiNq0FMujRQwCA9TMSDin/sgAAuXugAA2zC7A=
- Thread-topic: [xml-dev] Mixed content in data-binding (Was: Re: [xml-dev] 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@...<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@...</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@...<@last-modified>2005-02-02</@last-modified></em
ail>
And
<email>fred@...<@last-modified>2005-02-02<@says-who>Joe</@says
-who></@last-modified></email>
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