Daniela Barbosa, who is the business development manager for Synaptica at Dow Jones Client Solutions has written a fabulous eBook explaining how to mix taxonomies built by professionals and folksonomies, which let users tag content as they see fit. On one hand you have a controlled system. On the other, you are putting the power to organize within reach of the masses, but this can get chaotic. How do you reconcile these two seemingly disparate goals?
In an attempt to summarize the relationship among various metadata formats and how they relate to building Internet systems I wrote a glossary. I then ordered and tied the terms together with a bit of narrative to explain the relationships among the terms
"we have to (...) merge and leverage emerging and traditional tools to improve findability. (...) at the intersection of those two models is a more powerful framework for identifying, sharing, and finding information. The goal is a metadata ecology"
P. Tan, and D. Clarke. DCMI '07: Proceedings of the 2007 international conference on Dublin Core and Metadata Applications, page 123--127. Dublin Core Metadata Initiative, (2007)