If other tools are not sufficient to find an appropriate vocabulary, publishers can (and often do) rely on online communities by asking them directly.
This is a rather effortless solution which can be really efficient in some case. However, repeated enquiries about vocabularies can easily polute the traffic and publishers should first try to find a solution on their own, e.g., by following the links and indications and this wiki page.
Description: it is a Q&A service about semantic technologies, similar to StackOverflow.
Available at: http://semanticoverflow.com/