String Literals vs URIs

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Question: When encoding an occurrence in Darwin Core paleo should values be entered as string literals or as URIs?

Generally, Darwin Core allows either string literals or URIs, and currently string literals are more common. For example an entry for dcterms:type commonly is given as 'PhysicalObject' rather than http://dublincore.org/documents/dcmi-type-vocabulary/#dcmitype-PhysicalObject, but either is acceptable in Darwin Core and Darwin Core paleo.

This question is discussed in the Darwin Core QA thread at https://github.com/tdwg/dwc-qa/issues/58.

When encoded as RDF, then URIs shall be used, as documented in the RDF guide, http://rs.tdwg.org/dwc/terms/guides/rdf/index.htm.