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OAIster, OAI, and Metadata

OAIster is a comprehensive catalog of digital objects that cannot be roboted or spidered. It contains a wide range of scholarly and informational records, including articles, books, images, videos, and more. With over 10 million records, OAIster is a valuable resource for researchers and information seekers.

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OAIster, OAI, and Metadata

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  1. OAIster, OAI, and Metadata Kat Hagedorn University of Michigan Libraries January 23, 2007

  2. Why OAIster? • And why the silly name? • Initially, wanted to build the Academic HotBot (now we would say the Academic Google) • Essentially, a union catalog of digital objects that can’t be roboted or spidered • Currently, have more records that link to “objects” than there are records in our OPAC: 10 million

  3. What does OAIster contain? • Harvest everything available • except obvious test repositories • Keep nearly everything • must have a digital object link • must have decent metadata • must be scholarly or informational • For example…

  4. http://memory.loc.gov/mbrs/varsmp/0526.mpg Library of Congress Digitized Historical Collections http://louisdl.louislibraries.org/u?/AAW,22 LOUISiana Digital Library (LDL)

  5. Why do (should) people use it? • It’s big-- will pass 10 million (tomorrow) • It’s varied-- contains articles, books, images of artwork, datasets, videos, audios, finding aids, manuscripts • It keepsgrowing-- as long as they keep paying my salary

  6. One interface to rule them all? • If users don’t know these addresses… • www.oaister.org • www.oaister.umdl.umich.edu/o/oaister • …how do they get to the content? • We consider part of our mission making this metadata as widely available as possible, so…

  7. SRU interface • Federated search engines are “it” now--trying to solve problem of how to search simultaneously • Perfect place for OAIster • Built SRU interface (Z39.50 deemed older tech at this point) • ExLibris built connector for MetaLib tool • For example--

  8. Yahoo! and Google • Our metadata also available through Yahoo! Search and Google search • Send to them monthly • Incorporate URL (Google) or most of record (Yahoo!) • For example--

  9. OAI (or SAI) • Stands for Open Archives Initiative “…develops and promotes interoperability standards that aim to facilitate the efficient dissemination of content.” • Should have been called SAI: Shared Archives Initiative • Includes a Protocol for Metadata Harvesting (PMH), i.e., what we use to fill OAIster • Consists of data providers and service providers

  10. Metadata records • Data providers use protocol to share their metadata records • Service providers harvest the metadata so they can provide a service with it • Metadata needs to be • XML1.1 compliant • UTF-8 enabled • Sufficient for discovery

  11. Metadata varies widely • Formats • dc, mods, mets, marc, qdc, olac • Exhaustive vs. bare minimum • We strongly recommend using the “Best Practices for Shareable Metadata” http://oai-best.comm.nsdl.org/cgi-bin/wiki.pl?PublicTOC • Soon to be published by DLF

  12. Example: metadata variation • Sample date values <date>2-12-01</date> <date>2002-01-01</date> <date>0000-00-00</date> <date>1822</date> <date>between 1827 and 1833</date> <date>18--?</date> <date>November 13, 1947</date> <date>SEP 1958</date> <date>235 bce</date> <date>Summer, 1948</date>

  13. The ABCs to remember • No time to show • What other metadata formats provide • What associated thumbnails offer • What subject clustering looks like • But there’s a lot we can do with metadata, as long as it • is Available • follows Best practices • is used Consistently across the repository

  14. OAI: what it is not • OAI ≠ open access • “…defining and promoting machine interfaces that facilitate the availability of content from a variety of providers. Openness does not mean ‘free’ or ‘unlimited’ access to the information repositories that conform to the OAI-PMH.” • However, a large majority of OAIster records are available to all and sundry • Perfect opportunity-- freely sharing free stuff

  15. Questions? • Kat Hagedorn • University of Michigan Libraries • Digital Library Production Service • www.oaister.org • khage@umich.edu

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