Baggit specification question

Hi all,

Below is a question one of my colleagues posted to digital curation, but
I'm also posting here (because the more info the merrier).

Thanks!
Rosy

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Hi,

I am working for the Digital Preservation Network and our current
specification requires that we use baggit bags.

Our current spec for bag-info.txt reads in part:

"DPN requires the presence of the following fields, although they may be
empty.  Please note that the values of "null" and/or "nil" should not be
used.  The colon (:) should still be present."


From my reading of the baggit spec, section 2.2.2:

"A metadata element MUST consist of a label, a colon, and a value, each
separated by optional whitespace. "


2.2.2 is for the bag-info.txt, but it seems that this is the general rule.

Question: Are values required for all? Which below is correct or both? Ex:

Source-Organization:

or


Source-Organization: nil


I appreciate any clarification,

Thanks
James
Stanford Digital Repository