I'm interested in non-programmer tools that are available to help content creators "mark-up" their content for RDF (Resource Description Framework) discovery. We need good tools to describe free-form content that isn't already fielded in a database.
I am a big fan of FCKeditor (http://drupal.org/project/fckeditor), especially because it is so configurable. You can customize the fckstyles.xml file and add a new style like ...
...
<Style name="RDF Author" element="span">
<Attribute name="property" value="dc:creator" />
</Style>
...This would allow a user to "describe" text in an RDF acceptable format that designates the tagged data (using span) to describe the author of the content. You could change the SPAN tag to an H2 or whatever. In FCKeditor, you might need to change the "Enter mode" to be BR instead of P to allow the SPAN to work within the body text.
For a good introduction to RDF and semantically tagging content, this doc from the w3c is a really good start: http://www.w3.org/TR/xhtml-rdfa-primer.
Comments
WYMeditor
Another good option for an editor for putting RDFa into XHTML documents is the WYMeditor. It is also an open source project and the author is very interested in the slant of using RDFa. The WYM stands for "What You Mean" (instead of "What You See") and would seem to match the purpose of RDFa and the Semantic Web very well. Also, there is a project for integrating the WYMeditor into Drupal (http://groups.drupal.org/wymeditor), so that makes it a good match also.