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There seems to be an inconsistency between the Data Dictionary and
version 2 of the MIX schema. This may be intentional, in which case my
apologies.

In the Data Dictionary the element "Fixity" is defined as 'M'
(mandatory), while in http://www.loc.gov/standards/mix/mix20/mix20.xsd
the element is defined: <xsd:element name="Fixity" minOccurs="0"
maxOccurs="unbounded">. Which is correct?

I am implementing some MIX where we only have pre-recorded fields to
map, and no access to the files to generate checksums. I have the
choice between omitting the "Fixity" element entirely, or putting it
in with the "messageDigestAlgorithm" and "messageDigest" elements
empty. The result is the same, but I would prefer to produce valid MIX
that can be added to later, hence my question.

Many thanks.

Ed Fay
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Developer,Research Fellow     BOPCRIS,EASiHE
University of Southampton
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