How to obtain the schema contents using XDK

I have a requirement to access the entire schema - all elements, all simple types, complex types, annotations, etc. with the schema processor of the XDK in Java. I am wondering how to do this. All I get are the top level elements. I am not too sure how to browse each such entity. I cannot get things like hasChildren() and getChildren() (like in DOM tree nodes) in XSDNode or its implementations (XSDElement, XSDComplexType, etc). Could anyone help please?

XMLSchema schema;
Hashtable hashtable=schema.getXMLSchemaNodeTable();
http://otn.oracle.com/tech/xml/xdk/doc/beta/doc/java/javadoc/oracle/xml/parser/schema/XMLSchemaNode.html

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