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RE: Re: What is XML For?

jaxb existing classes
Just few comments...
> 	JAXB is a Java API, released just about now, that lets
> you generate Java classes directly from a schema. By default
> it's an obvious mapping, i.e. an attribute becomes a member
> variable, but you can customise the mapping freely with an
> XML template file, for example mapping an element to a
> pre-existing class or specifying a class of your own that will
> do the translation (both ways) for that element type.
> 	It seems that Castor (mentioned by Jeff Lowery) is similar,
> but it works on existing Beans whereas JAXB generates new bean-like
> classes?

Castor can actually also generate beans from an XML Schema too. There
are three types of use of the Marshalling Framework in Castor:

1- you have an XML schema (or a DTD) and no object model: castor can
generate a Java object model from the XML schema as well as a set of
classes that will hold the XML information needed to validate the data
read or write.

2- you have an existing object model and you want to read/write XML from
it by customizing Castor: you can configure a mapping file that will
hold the mapping information between an XML document and your object

3- you have a set of beans: Castor will introspect them to read/write

You can also leverage those 3 approaches to fit your needs.
More information on Castor is available at www.castor.org and will
support JAXB in a future release.


> 	So, to answer your question; you would instantiate objects
> of these custom classes, initialise them and connect them up as
> desired, then call a 'marshal' method for the root object, which
> yields the XML.
> 	I've been trying the early-release implementation (based
> on DTDs rather than schema) and I've enjoyed using it. It's a whole
> lot more fun than running a DOM through an identity transformation.
> When you want a 'customer' element, it's nice to be able to say
> new Customer( "fred" ).
> 						David
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