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Extracts the citation annotation from the metadata annotation of thenexml object, and returns its value.

Usage

get_citation(nexml)

Arguments

nexml

a nexml object

Value

the citation if the metadata provides one that is non-empty, and NA otherwise. If multiple non-empty annotations are found, only the first one is returned.

Details

Currently the implementation looks for dcterms:bibliographicCitation annotations. (Note that these may be given with any prefix in the metadata so long as they expand to the same full property URIs.)