Modified Files:
 	XMLSchema.py -- added some code to generate user interpretable
          exceptions.



BEFORE:

  File "/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/site-packages/ZSI/wstools/Utility.py", line 600, in __getitem__
    return self.data[key]
KeyError: u'xtvd'

AFTER:
  File "/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/site-packages/ZSI/wstools/XMLSchema.py", line 465, in getQNameAttribute
    raise KeyError, "targetNamespace(%s) collection(%s) has no item(%s)"\
KeyError: u'targetNamespace(urn:TMSWebServices) collection(types) has no item(xtvd)'


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