RDF Media, a UK-based television production company with a division in the USA.
Reality distortion field, a reference to company managers, such as Steve Jobs, who are able to convince others, through their charisma, into participating in otherwise absurd or unaccomplishable projects
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RDF allows for representation of rich metadata relationships beyond what is possible with earlier flat-structured RSS.
The existing RDF base in RSS 0.9 was the reason for choosing to build on the earlier version of RSS; attempting to re-introduce RDF into RSS version 0.91 proved a "putting the toothpaste back into the tube" proposition.
The opening RDF tag assocaties the rdf: namespace prefix with the RDF syntax schema and establishes the RSS 1.0 schema as the default namespace for the document.