vLib Resource Types revised

Resource types have been revised.

The former resource types Factual Database, ePrint Server, and Subject Gateway are now generally typed as Miscellaneous.

Old links should redirect if defined for interfaces /start or /resource_type (more info on service interfaces).

A complete list of eBook-related resources is now available at http://vlib.mpg.de/start?type=Book%20Collection.

Hence the option eBooks has disappeared from the Special Content dropdown at http://vlib.mpg.de/start?srv=locate. Former deep links, for example http://vlib.mpg.de/start?special=ebooks, should continue to be supported if set up using the above service interfaces.