From a different list I learned of the following WorldCat metadata API webinar, and I thought some of us over here maybe interested too. From the description: 

  The WorldCat Metadata API supports a variety of cataloging
  functionality for libraries to catalog their collections in
  WorldCat. This API provides you with the tools to create
  applications to add new, and enrich existing, WorldCat
  bibliographic records, and maintain WorldCat institution holdings
  and local bibliographic data.

  In this workshop, we'll review the features, discuss some
  practical use cases, and demonstrate how the API works. Then
  we'll open up the conversation to ask about the ways you are
  thinking about using it: What problems are you trying to solve?
  Where do you see it adding value for your institution? If you are
  already working with the WorldCat Metadata API, you're welcome to
  join us and talk about the problems you're solving and your
  experiences working with this API.

For more detail, see OCLC's news item as well as their registration page. [0, 1]

[0] news item -
[1] registration -

Eric Morgan