Order sensitivity in schemaLocation and noNamespaceSchemaLocation
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                 Key: XERCESC-1659
                 URL: http://issues.apache.org/jira/browse/XERCESC-1659
             Project: Xerces-C++
          Issue Type: Bug
          Components: Validating Parser (Schema) (Xerces 1.5 or up only)
    Affects Versions: 2.7.0
         Environment: all
            Reporter: Boris Kolpackov


I am attaching two test cases (each consists of 3 schemas plus an XML 
instance). If you try to run domprint on the first test case, you will get the 
following error:

$ domprint -v=always -n -s -f test-users.xml 

Error at file "test-users.xml", line 6, column 78
   Message: Unknown element 'b:UserDatabase'

If you change the order of the schemaLocation and noNamespaceSchemaLocation 
attributes in test-users.xml then the error disappears.

The second test case is a slight modification of the first test case with the 
only difference being the schemas with targetNamespace are now do not have a 
namespace, and the schema that used to be without a namespace 
(derived-user-config.xsd) now is in a namespace. If you run domprint on this 
test case, you will get the following error:

$ domprint -v=always -n -s -f test-users.xml 
Error at file "test-users.xml", line 6, column 55
   Message: Unknown element 'UserDatabase'

This seems to prove that for Xerces-C++, for some reason, it is important that 
the schema that declares the root element is mentioned in the first *Location 
attribute (nor matter whether schemaLocation or noNamespaceSchemaLocation). Now 
comes the surprise: if we reverse the order of the two attributes in the second 
test case, domprint terminates with segmentation fault. Examination of the core 
points to the IGXMLScanner.cpp, line 2288:

            elemDecl = fGrammar->getElemDecl(
                uriId, nameRawBuf, qnameRawBuf, currentScope
            );



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