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   RE: [xml-dev] When to design an attribute in a namespace?

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Title: RE: [xml-dev] When to design an attribute in a namespace?

> From: kynn@panix.com
> But I am interested in learning to recognize those rare situations
> in which, as a designer, one *should* put a particular attribute
> in a namespace.  This is still very unclear to me.  What are the
> requirements that an attribute must fulfill to be a good candidate
> for being placed in a namespace by the schema/DTD designer?

I'm not sure if this example is relevant, but it certainly has attributes in different namespaces.

Zope (http://zope.org/) uses the Template Attribute Language (TAL) in its page templates. Using TAL, Zope can transform a page template to the final XHTML.

For instance (I'm stretching things slightly here, and comments about suss XHTML will be ignored :-):

    <p tal:repeat="row here/listWorkItems">
      Item ID: <span tal:replace="row/item_id"/>
      Task ID: <div tal:content="row/task_id">Content goes here</div>

The tal:repeat attribute specifies a loop using "row" as the loop variable and "here/listWorkItems" as the list to iterate over.

The tal:replace attribute causes the entire <span> element to be replaced with the specified item id.

The tal:content attribute causes "Content goes here" to be replaced with the specified task id, while leaving the <div> in place.

Just specifying "repeat", "replace", etc won't work, because these aren't acceptable XHTML attributes. Using attributes from a different namespace seems to fit the bill nicely.

Peter Mayne
Technology Consultant
Spherion Technology Solutions
Level 1, 243 Northbourne Avenue, Lyneham, ACT, 2602
T: 61 2 62689727  F: 61 2 62689777

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