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Once the RDF module has been enabled the HTML validator complains about tons of issues:
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML+RDFa 1.1//EN">
<html lang="de" dir="ltr"
xmlns:content="http://purl.org/rss/1.0/modules/content/"
xmlns:dc="http://purl.org/dc/terms/"
xmlns:foaf="http://xmlns.com/foaf/0.1/"
xmlns:og="http://ogp.me/ns#"
xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"
xmlns:sioc="http://rdfs.org/sioc/ns#"
xmlns:sioct="http://rdfs.org/sioc/types#"
xmlns:skos="http://www.w3.org/2004/02/skos/core#"
xmlns:xsd="http://www.w3.org/2001/XMLSchema#">
<head profile="http://www.w3.org/1999/xhtml/vocab">
<meta charset="utf-8" />
Validator wines about xmlns:*
and tons of other issues.
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