committing a fix for a problem (XSTypeHelper.schemaTypesIdentical should work on non-null parameters only) reported by Mikael Asberg on Xerces-J user's list.
committing a fix for a problem (XSTypeHelper.schemaTypesIdentical should work on non-null parameters only) reported by Mikael Asberg on Xerces-J user's list.

git-svn-id: 39602be06c88ea89c23a8a9fd3d1314146990de6@983882 13f79535-47bb-0310-9956-ffa450edef68

RackerWilliams/xercesj,RackerWilliams/xercesj,RackerWilliams/xercesj