Title	XML Schema in XML Documents with Usage Control
Author	Lili Sun, Yan Li
Citation	Vol. 7  No. 10  pp. 170-177
Keywords	XML documents, Document Type Definition(DTD), XML Schema, Usage control, Authorization

Title	Storage Techniques for Heterogeneous Reference Type Data in an XML Schema
Author	Hwan-Seung Yong, Kyoung-Hye Lee, Wol Young Lee, Minsoo Lee
Citation	Vol. 8  No. 8  pp. 217-224
Keywords	PDTNet XML schema, heterogeneous reference type, IDREFS