- It is completely compatible with existing popular user agents.
- There are lots of implementations out there already that support extracting semantics marked up via RDFa.
- It is already in use by the Yahoo! SearchMonkey engine.
- Popular user agent plugins such as Operator and Fuzzbot already understand it.
- While the mechanism is not explicitly defined (yet) it is possible to use the same markup in HTML and XHTML pages and get the same semantics.
- Unlike microformats, the idiom for annotating your content does not conflict with the normal semantics of (X)HTML (e.g., the class attribute, the title attribute, and abbr).
For lots more information on how to start using RDFa right now, see the rdfa.info web site.