Standardizing vocabulary in Dublin Core

For most systems, Dublin Core(DC) is the lowest common denomenator metadata. Fedora automatically creates DC metadata that can be edited. The program verifies that it is properly constructed DC, otherwise it will not accept the changes. When creating a basic collection based on the University of Hull's documentation, the DC values that need to be present are DC:TITLE, DC:IDENTIFIER (which is generated automatically as the unique identifier [or PID, as it is referred to in Fedora), and DC:DESCRIPTION. What I am going to need to tackle very soon is standardizing what is acceptable entries in each field and notate that in a reference guide -- because I know I can't remember what I just entered for the item before, let alone for the previous collections. Also, for a description, what should be the standard for letting know what an object is? Is it necessary to say that something is a photograph, or will that be inferred? Is there added-value to describing something as a "Photograph of Bibles in a Custom Wood case" versus just saying "Bibles in a Custom Wood case"?

Hmmn...