From the webpage:
The OCLC Developer Network is a community of developers collaborating to propose, discuss and test OCLC Web Services. This open source, code-sharing infrastructure improves the value of OCLC data for all users by encouraging new OCLC Web Service uses.
Thought while I was looking at OCLC resources I might as well give a shout out to the OCLC Developer Network. A community that has an interest in identifiers and identification for the purpose of furthering access to information. Who could be more sympathetic to topic maps?