Advance Database Systems : basics of xml, xml databases, native xml databases, hybrid systems, the data model for xpath and xquery, schema free native xml database collections, usage of native xml databases, problems of the fully xml based storage layers, relational repositories with xml wrapping layer, hybrid repositories, xpath node test, predicates, atomization, positional access, combining node sequences, dynamic constructors, iteration, function, modifying xml documents, dtd and xml schema, the most important xml schema elements, language independent processing strategies, the fundamental of document design.