a problem with alternative approaches:

For some applications the use of other approaches may be valid. If the type of data to be described does not map to an existing microformat, RDFa can embed arbitrary vocabularies into HTML, such as for example domain-specific scientific data such as zoological or chemical data for which there is no microformat. Standards such as W3C's GRDDL allow microformats to be converted into data compatible with the Semantic Web.

Another advocate

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