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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 -------------------------------------------- Developer,Research Fellow BOPCRIS,EASiHE University of Southampton [log in to unmask] +44 (0)23 8059 3575 --------------------------------------------