Fixed xs:boolean to reject the empty string (reported by Bas Driessen on
* xmlschemas.c xmlschemastypes.c: Fixed xs:boolean to reject the empty string (reported by Bas Driessen on the mailing-list). Fixed schema XSI-acquisition and construction: the schemata (xmlSchema) didn't get the targetNamespace in some cases, thus the component resolution mechanism failed to work. The XSI stuff needs to be tested more intensively; think about how to test this for regression.
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