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   Software to generate all valid XML instances from a XML schema

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Is there any software that can generate all valid XML instances from a 
specified XML schema?  The nearest I could find is "XML Monkey" on 
sourceforge.net, which hasn't released any code yet.

In my particular application, I am testing the XML import-export 
capabilities of a certain complex class of ours (call it class Foo).  I want 
to use this software (that I'm looking for) to generate all valid XML 
instances from our Foo.xsd, then instantiate a Foo and set its values by 
importing each XML instance, then exporting each resulting Foo instance to 
XML, and finally checking that the original XML instance is XML-equal to the 
XML that the Foo exported.

Clearly I'm over-generalizing when I require that the software generate "all 
valid XML instances" (per the schema), since that could easily be an 
infinite number of instances; even a totally finite schema can lead to a 
computationally unreasonable number of XML instances to test.  So more 
realistically I want the software to generate the boundary conditions: 
minOccurs, maxOccurs (if it's finite), and maybe 2-3 values in between.  If 
maxOccurs is unbounded, then I figure the software should generate something 
cases for minOccurs, minOccurs * 2, and minOccurs * 4, substituting 1 for 
minOccurs in the latter two cases when minOccurs is 0.

I appreciate anyone letting me know of software that already does this 
before I commit to writing it myself.  Thanks!


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