doing little refactoring of schema 1.1 code base. moving certain functions to CTA and assertion's own classes, and adding few getters and setters to support this refactoring.

git-svn-id: https://svn.apache.org/repos/asf/xerces/java/branches/xml-schema-1.1-dev@1479073 13f79535-47bb-0310-9956-ffa450edef68