  With the adoption of Semantic Web technologies, an increasing number of
vocabularies and ontologies have been developed in different domains, ranging
from Biology to Agronomy or Geosciences. However, many of these ontologies are
still difficult to find, access and understand by researchers due to a lack of
documentation, URI resolving issues, versioning problems, etc. In this chapter
we describe guidelines and best practices for creating accessible,
understandable and reusable ontologies on the Web, using standard practices and
pointing to existing tools and frameworks developed by the Semantic Web
community. We illustrate our guidelines with concrete examples, in order to
help researchers implement these practices in their future vocabularies.
