BASE is one of the world's most voluminous search engines especially for academic web resources. BASE provides more than 140 million documents from more than 6,000 sources. You can access the full texts of about 60% of the indexed documents for free (Open Access). BASE is operated by Bielefeld University Library.
We are indexing the metadata of all kinds of academically relevant resources - journals, institutional repositories, digital collections etc. - which provide an OAI interface and use OAI-PMH for providing their contents (see our Golden Rules for Repository Managers and learn more about OAI at the Open Archives Initiative or Wikipedia).
The index is continuously enhanced by integrating further sources (you can suggest a source which is not indexed yet). We are working on several new features like a claiming service for authors within the ORCID DE project.
BASE is a registered OAI service provider. Database managers can integrate the BASE index into their local infrastructure (e.g. meta search engines, library catalogues). Further on there are several tools and services for users, database and repository managers.
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
- Correction, normalization and enrichment of metadata by means of automated methods
- The display of search results includes precise bibliographic data
- Display of access and terms of re-use for a document
- Several options for sorting the result list
- "Refine your search result" options (by author, subject, DDC, year of publication, content provider, language, document type, access and terms of re-use)
- Browsing by DDC (Dewey Decimal Classification), document type, access and terms of re-use / licence.