A Free yet feature rich metadata plugin that can optimize your web site for more efficient indexing and easier sharing of your content.
Allows a user to add dublin core metadata (of their choice) to a wordpress post.
Inserts OWMS metadata as meta tags into all post types. Provides options screen in admin area for setting default values.
It allows to manage a publication repository and exposes metadata in order to be indexed by Google Scholar
Implements some Dublin Core metadata elements for WordPress posts.
wp-RDFa brings the semantic Web to WordPress