+ More than 25 million records from more than 1.720 repositories worldwide
+ About 3 million records this year or about 14.200 records per day, while the number of repositories increased in 2010 about 22 % until now
+ More and more journals deliver content via OAI-PMH (especially journals using OJS), which is another evidence for the growing importance of open access in scholarly communication
BASE is one of the world's most voluminous search engines especially for academic open access web resources. BASE is operated by Bielefeld University Library.
As the open access movement grows and prospers, more and more repository servers come into being which use the "Open Archives Initiative Protocol for Metadata Harvesting" (OAI-PMH) for providing their contents. BASE collects, normalises, and indexes these data.
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In comparison to commercial search engines, BASE is charcterised by the following features:
+ Intellectually selected resources
+ Only document servers that comply with the specific requirements of academic quality and relevance are included
+ A data resources inventory provides transparency in the searches
+ Discloses web resources of the "Deep Web", which are ignored by commercial search engines or get lost in the vast quantity of hits.
+ The display of search results includes precise bibliographic data
+ Several options for sorting the result list
+ "Refine your search result" options (authors, subject headings, year, resources and language)
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