Distribution of bundles of features
Let's say you want to support a format called BiblioStuff. You can write the corresponding schema in pyblio, along with a parser and a write which support this format. Then, you can possibly add a few adapters so that BiblioStuff databases can be mapped to BibTeX databases for instance.
The idea is to be able to package the schema with the supported parsers, adapters,... in an easy to distribute object. A potential tool would be to use python eggs.