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Editorial Team
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Asked: 2026-06-11T20:08:25+00:00

I’m setting up a HTML5 webpage and want to include RDFa. I try checking

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I’m setting up a HTML5 webpage and want to include RDFa.
I try checking the syntax with the w3 validator, and check the extracted RDF using the w3 RDFa distiller. When I declare namespaces using xmlns:<ns>="<uri>" the validator complains that the attribute is not allowed there, and the specs say that xmlns is deprecated, but if I try the other suggested prefix="<ns> <uri>" the distiller doesn’t discover the RDFa embedded on my page. Which way should I stick to?

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1 Answer

  1. Editorial Team

    Use @prefix. The key to your problem is in the first couple of sentences on the W3C’s RDFa Distiller page:

    This distiller corresponds to the RDFa 1.0 specification. In 2012, W3C has published an updated version of that specification, called RDFa Core 1.1. A new distiller,
    processing RDFa 1.1 content, has been implemented which suprecedes this one.

    The @prefix attribute is a new addition in RDFa 1.1 and therefore not recognized by the old Distiller.

    The W3C RDFa 1.1 Distiller should be able to handle it correctly.

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