The BBC recently withdrew their use of microformats because of concerns about accessibility. In October 2008 W3C released a specification for RDFa - using which embeds RDF in attributes in XHTML. In the library world there has been some use of COiNS which embeds structured data in the form of an OpenURL in a span in (X)HTML.
What are the pros and cons of the different approaches? What are the overall benefits of embedding structured data in web pages? How does this compare with the idea of using http 303 to present machine-readable version of resources?
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