Falcon: Finished abstracting the syntax of an MXML document behind a complete set of interfaces (IMXMLData, IMXMLTagData, IMXMLTagAttributeData, etc.) The other parts of the compiler now access the MXML document only through these interfaces rather than through the concrete classes.

git-svn-id: https://svn.apache.org/repos/asf/flex/falcon/trunk@1454275 13f79535-47bb-0310-9956-ffa450edef68