http://www.w3.org/TR/1999/REC-rdf-syntax-19990222/#containers
Sentence 3 of 3.1 Container Model; Alternative:
An application using a property whose value is an Alternative collection is aware
that it can choose any of the items in the list as appropriate.
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For the singular/plural question as well as the use of rdf:resource
cf. second example in 3.2.1 of RDF M&S.
rs
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