August 2007
The Coming Revolution in Scholarly Communications & Cyberinfrastructure
Screencast link Compound Information Object Demo Screencast
Herbert Van de Sompel, Los Alamos National Laboratory
Carl Lagoze, Cornell University

4.3 Discovering Compound Objects on the Web

Exposing compound objects on the web via Resource Maps is only part of the solution; the Resource Maps and its referenced resources need to be discovered to really become part of the web graph. OAI-ORE proposes two complementing approaches with this regard:

  • Harvest type discovery, which consists of making batches of Resource Maps available through existing mechanisms such as RSS, Sitemaps, and OAI-PMH.
  • Linked Data 11 type discovery, which uses HTTP headers received in response to dereferencing the URI of a component of a compound object to point at the Resource Map(s) that correspond(s) with the compound object. This is shown in Figure 8 where a crawler lands upon splash page S and is pointed at the Resource Map R by means of a HTTP LINK header contained in the response to an HTTP GET request issued against S. From R, the crawler can obtain a Resource Map representation, and hence a list of all resources that are part of the compound object, as well as further internal and external relationships.

Figure 8

Figure 8. A web crawler discovering the Resource Map via HTTP LINK HEADER.

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Reference this article
Van de Sompel, H., Lagoze, C. "Interoperability for the Discovery, Use, and Re-Use of Units of Scholarly Communication," CTWatch Quarterly, Volume 3, Number 3, August 2007. http://www.ctwatch.org/quarterly/articles/2007/08/interoperability-for-the-discovery-use-and-re-use-of-units-of-scholarly-communication/

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