David Hawking , Web Search Engines: Part 1 and Part 2 IEEE Computer, June 2006.
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Current Developments and Future Trends for the OAI Protocol for Metadata
OAI-PMH was created to increase interoperability of metadata. First formatted fore e-print archives, it quickly gained use in museums and libraries, which used OAI-PMH for metadata harvesting. Now, Open access systems such as D-Space and Contentdm (OCLC) package OAI with their products. The Protocol of Metadata Harvesting works by faciliating different types of metadata based on common standards, such as HTML or Dublin Core.
MICHAEL K. BERGMAN, “The Deep Web: Surfacing Hidden Value”
The article focuses on the "deep web" online sources and sites whose information is only accessible by direct query. One caveat of the deep web is that many web search engines do not have the capability to successfully retrieve information from these sites. Another problem is that answers can only be retrieved one at a time.
Deep web documents are 27% less sizable than surface web documents, but have a greater diversity of web sources.