2[1]William Y Arms, Diane Hillmann, Carl Lagoze, et al. A Spectrum of Interoperability [ J/OL]. http://www. dlib. org/dlib/janua/ry02/arms/01 arms. html, 2001.
3[2]Carl Lagoze, Herbert Van de Sompel. The Open Archives Initiative: Building a Low- barrier Interoperability Framework [ J/OL] .http://www. openarchives. org/documents/oai. pdf,2001.
4[3]Clifford A Lynch. Metadata Harvesting and the Open Archives Initiative [ EB/OL ] . http://www. arl. org/newsltr/217/mhp.html,2001-08.
5[4]Cal Lagoze, Walter Hoehn, David Millman. Core Services in the Architecture of the National Digital Library for Science Education ( NSDL ) [ J/OL ] .http://arxiv. org/ftp/cs/papers/0201/0201025. pdf, 2001.
6[2]Lassila O, Swick R. Resource description framework (RDF) model and syntax specification, W3C recommentation [DB/OL]. http: //www. w3.org/TR/ REC-rdf-syntax/, 1999-02/2003-01-15
7[3]Fensel D. Ontology-based knowledge management[J]. Computer,2002,35(11) :56 ~ 59
8[4]Baader F, Calvanese D, McGuinness, et al. The description logic handbook: theory, implementation and applications [M]. Cambridge, UK: Cambridge University Press, 2002
9[5]Horrocks I. Some notes on the differences between DAML + OIL and DAML + ONT [ DB/OL]. http: //www. daml. org /2000/12/ differences-daml. html, 2000-12/2003-02-10