curationexperts / mahonia / 949

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Pull #258

travis-ci

Support typed EDTF data for the `Etd#date` field

An `RDF::Literal` subclass for EDTF datatypes is introduced. This supports the
id.loc.gov namespaced datatype for EDTF and can accept any string value as its
lexical value. We test that when a date is set to this type, it is correctly
serialized in the object's `.ttl` view.

Handling is added to `EtdIndexer#generate_solr_document` to ensure edtf dates
are indexed text values (they are also indexed as dates, but we do not consume
them in catalog controller or elsewhere). The correct appearance of typed data
in the show view is tested.

Dates input through the `EtdForm` are cast to the typed literal so they can be
serialized to Fedora with the correct type. We assume any value put into the
"EDTF Date" form field is intended to be interpreted as typed data.

Factories are updated to set an EDTF date on build.

Closes #186.

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