What makes a good federated collection?
- Description of who, what & why about the collection including well-documented, clearly written information about contributing (or harvested) collections and criteria or standards for inclusion.
- Options for searching and/or browsing at different levels, with limit functions built in.
- Current / up-to-date
- Authoritativeness
The following three "service providers" meet these criteria for the most part. The only exception is the out-of-date / non-current nature (as far as I can tell) of the Sheet Music Consortium site.
Sheet Music ConsortiumThe UCLA Digital Library Program serves as the host for a database of harvested metadata for open access digitized sheet music. This initiative is being developed by four participating institutions in the consortium: UCLA, Indiana University, Johns Hopkins University, and Duke University. In addition, the Library of Congress Music Division, the National Library of Australia and the “Maine Music Box” at the University of Maine have metadata that has been harvested. The Consortium site also provides a list (“Sheet Music on the Web”) of other web sites and institutions that have sheet music collections. The site provides basic search, browse, and advanced search options. The site does not appear to be active. The last date I see for page updates are 2003. Nevertheless, the service is useful and easy to use. I searched (using the Advanced Search) for records with the keyword “cowboy*” and selected “Digitized Sheet Music Only”. This retrieved 14 metadata records. (When I did not include the limit “Digitized Sheet Music Only”, the result was 80 records.) One of the records I pulled up was for “Pony Maid” and the lyrics start out “In Arizona there lives a maid, loved by a great big Cowboy…”!
OISter
Describing their service as a “union catalog of digital resources”. Their focus is “useful, academically-oriented” digital resources. As of Nov. 19, 2008, OISter provides access to 18,530,232 records from 1039 contributors (including SIRLS’ DLIST, the Arizona Memory Project, the UA Libraries Special Collections). There is no browse option. The search function provides options to search within fields, limit by resource type and sort. I like how the results page allows you to see the results grouped by data contributor. A search on Arizona and cowboy* in the subject field resulted in 173 records from 8 different collections (including Arizona Memory Project and the NAU Colorado Plateau Digital Archives). This is a robust, up to date and well-maintained site.
National Science Digital Library
From the FAQ for the National Science Digital Library – “As of September 2008, NSDL contained 153 unique collections of resources and over 2 million records… NSDL collections and services are selected from high quality providers of scientific and technical materials that are accurate and appropriate for educational settings. Consequently, NSDL's search results are drawn only from this body of pre-selected materials.” The NSDL search allows you to select a variety of limits, including audience, resource format, grade level, subject and “pathway” (an audience-specific views of selected NSDL resources – or portal). There is a browse collections option, either “all collections” or within broad subject categories (biological & health; geosciences, mathematics, etc.) – and within those categories the option to focus on research or education collections. I did a search using the keywords “cowboy*” and “ranch*” and limited to k-12. I got 3 results. When I searched “Arizona” and “ranch*” as a general search, I got 55 results, many of which were scholarly, scientific articles. This is an authoritative flexible, well-supported service provider with lots of depth as well as breadth.