Switch turtle representation and clean up FossilSpecimen.
Clean up LivingSpecimen.
Clean up HumanObservation.
Clean up MachineObservation.
Clean up PreservedSpecimen.
Clean up lang specification for annotations in dwctypes.
FossilSpecmen as a PreservedSpecimen.
Examples typed as strings.
Deprecated VocabularyEncodingScheme.
Set the class hierarchy for MaterialSample and specimen types.
Changed file format to Turtle for dwctypes.owl and standardized lang Annotation.
Added Occurrence to dwctype.owl.
Added Taxon to dwctypes.owl and set data type of issued and modified to dateTime.
Added DCType:Event to dwctypes.owl.
Experiment to develop on branch feature/dwctypes.
Redefinition of Event to dcmitype instead of dwctype.
Removed the now obsolete file dwcterms.owl. Contents are in dwctype.owl.
Added has curation status for the DwC Types that didn't have them.
Clarified the comments on DwCType classes that reference other classes of the same name.
reverted dwcterms to version from commit 22ae831d0a2870bd41fc06944af3db6b599ea591