Fix for bug#18341; when a type was derived from a type declared in another...

Fix for bug#18341; when a type was derived from a type declared in another schema, the right grammar was not restored, and the type was not found


git-svn-id: https://svn.apache.org/repos/asf/xerces/c/trunk@175688 13f79535-47bb-0310-9956-ffa450edef68