Roderick A. MacLeod has posted a useful summary of some of the key documents and findings of the PerX (Pilot Engineering Repositories Xsearch) project on JISC-REPOSITORIES. He notes: "These documents may help to dispel possible myths concerning the ease of service provision, ease of reharvesting metadata, surfacing digital repository content in third part services, etc."
Here’s a excerpt from the project’s About page that describes it:
PerX is a two-year (June 2005-May 2007) JISC Digital Repositories Programme project, to develop a pilot service which provides subject resource discovery across a series of repositories of interest to the engineering learning and research community. This pilot will then be used as a test-bed to explore the practical issues that would be encountered when considering the possibility of a full scale subject resource discovery service.
(Prior posting about PerX.)