Check out the TDL Metadata Working Group’s post “Using Library Metadata as Linked Data on the Web.”
“How can libraries make their metadata—both MARC and Non-MARC legacy metadata—linked data compliant so that users can find library metadata on the Web? For years libraries have used closed systems or silos that housed and worked with their unique library metadata. Unfortunately, no one could find this dearth of rich information on the Web through search engines like Google, because library systems do not allow Web spiders/crawlers—whose job it is to gather information and index it—to index library metadata and make it findable through an internet search engine…”
Read the whole thing here.