1. Extensible Markup Language – XML. Available at:
http://www.w3.org/XML
2. Bradley, N.: The XML Companion, 2nd edn., p. 435. Addison-Wesley Longmann Limited, Reading (2000)
3. Busse, S., Kutshce, R., Leser, U., Weber, H.: Federated Information Systems: Concepts, Terminology and Architectures. Technical Report 99–9, Universität Berlin (1999)
4. W3C Semantic Web. Available at:
http://www.w3.org/2001/sw
5. Elmagarmid, A., Rusinkiewicz, M., Sheth, A.: Management of Heterogeneous and Autonomous Database Systems, p. 413. Morgan Kaufmann Publishers, Inc., San Francisco (1999)