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http://www.w3.org/2000/01/rdf-schema#comment
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A broadcasting service.
Instances of this concept include BBC Radio Wales, BBC Radio 4, BBC News, etc.
A service is a collection of outlets which contain common material, but with some variations, e.g. by
region.
Hence, a service may have multiple outlets (po:Outlet), e.g. BBC Radio 4 has BBC Radio 4 LW and BBC Radio 4 FM.
A hierarchy of services types is defined within this ontology, e.g. radio and TV.
A service that is a master brand only (a service that only commissions programmes, e.g. BBC Switch) should
be an instance of the top-level po:Service.
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