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   RE: [xml-dev] What should TrAX look like? (Was: Re: [xml-dev] Article on

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> I suspect it would be much cleaner to take an approach like 
> Jaxen's. In 
> this approach there's a core set of basic operations that all 
> model-connectors must implement (getChild, getAttribute, getParent, 
> etc.). However most other axes have default implementations 
> that build 
> on top of the basic operations. For instance, the ancestor axis is 
> easily implemented on top of getParent. Thus a minimal implementation 
> only has to provide about 20 fairly straight-forward operations.

This is similar to the design of Saxon's NodeInfo interface, except that in
NodeInfo there are no methods such as getParent and getChild, instead the
provider must implement a minimum set of axes: ancestor, child, attribute.
For other axes, the provider can call on helper implementations provided by

Michael Kay


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