'Marketing' with Metadata - How Metadata Can Increase Exposure and Visibility of Content. OAI-PMH, Z39.50, SRU/SRW, RSS
There are many advantages of exposing metadata. If you want people to be able to find your content, then exposing your metadata in standardised ways makes real sense. This is equally true for data providers with content they wish to give away freely, and also for those who wish to charge for their content or restrict access to registered users.