研究语义网的朋友一定想知道，世界上到底已经存在多少本体库了？在这里您可以找到答案
SWDs:semantic web documents
SWOs:semantic web ontologies
(2002) Eberhard [1] reported 1,479 SWDs with about 255,000 triples out of nearly 3,000,000 Web documents.
(2003) OntoKhoj [2] reported 418 ontologies out of 2,018,412 Web documents after 48 hours crawling.
(2004) DAML Crawler [3] reported 21,021 DAML files out of 743,017 Web documents as of April, 2004.
(2004) Swoogle version 1 had collected 16,000 SWDs including 4,880 SWOs during May 2004.
(2005) Swoogle version 2 had incrementally collected 328,987 SWDs including 11,278 SWOs out of 1,194,992
(2006) Swoogle Semantic Web search engine[4] discovered and indexed its millionth document. Of these, about 77% are valid RDF documents, 15% HTML documents with embedded RDF and 8% appear to be RDF documents but can not be parsed.
参考文献：
[1] A. Eberhart. Survey of rdf data on the web. Technical report, International University in Germany,
2002.
[2]C. Patel, K. Supekar, Y. Lee, and E. K. Park. OntoKhoj: a semantic web portal for ontology searching,
ranking and classification. In WIDM’03: Proceedings of the 5th ACM international workshop on Web
information and data management, pages 58–61, 2003.
[3]M. Dean and K. Barber. Daml crawler. http://www.daml.org/crawler/ (last visited on
March 2006), 2002.
[4]Tim Finin http://ebiquity.umbc.edu/blogger/2006/02/06/swoogle-over-1000000-swmantic-web-documents/ on Monday, February 6th, 2006
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