As per the previous thread earlier this year, it is not possible
to compose schemas using imports with JBossXB.

I've fixed this, with the new implemetation, I can now get an
XSModel for the JavaEE schemas (which previously failed due
to confusion of imports).

The new implementation looks like this:

 private InputSource getInputSource(String nsURI, String baseURI, String schemaLocation)
 {
 boolean trace = log.isTraceEnabled();
 InputSource is = null;

 if( trace )
 log.trace("getInputSource, nsURI="+nsURI+", baseURI="+baseURI+", schemaLocation="+schemaLocation);

 // First try what is requested
 try
 {
 is = resolver.resolveEntity(nsURI, schemaLocation);
 if (trace)
 log.trace("Resolved schema using namespace as publicId and schemaLocation as systemId");
 }
 catch (Exception e)
 {
 if (trace)
 log.trace("Failed to use nsUri/schemaLocation", e);
 }

 // Next, try to use the baseURI to resolve the schema location
 if (is == null && baseURI != null && schemaLocation != null)
 {
 try
 {
 URL url = new URL(baseURI);
 url = new URL(url, schemaLocation);
 String resolvedSchemaLocation = url.toString();
 // No point if the schema location was already absolute
 if (schemaLocation.equals(resolvedSchemaLocation) == false)
 {
 is = resolver.resolveEntity(null, url.toString());
 if( trace && is != null )
 log.trace("Resolved schema location using baseURI");
 }
 }
 catch (Exception e)
 {
 if (trace)
 log.trace("Failed to use schema location with baseURI", e);
 }
 }

 // Finally, just try the namespace as the system id
 if (is == null && nsURI != null)
 {
 try
 {
 is = resolver.resolveEntity(null, nsURI);
 if( trace && is != null )
 log.trace("Resolved namespace as system id");
 }
 catch (Exception e)
 {
 if (trace)
 log.trace("Failed to use namespace as system id", e);
 }
 }
 if( trace )
 {
 log.trace("getInputSource, nsURI="+nsURI+", baseURI="
 +baseURI+", schemaLocation="+schemaLocation+", is="+is);
 }
 return is;
 }

Previously, the last step was first, making it impossible
to compose a namespaces from different schema files.

Also, it didn't use the schemaLocation properly so it always
failed for simple imports like:

 <xsd:include schemaLocation="javaee_web_services_client_1_2.xsd"/>