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I'm working on an implementation of the MIX NISO standard in xml.

 

 

I'm confused by an apparent mismatch between the data dictionary http://www.niso.org/standards/resources/Z39_87_trial_use.pdf

and the MIX documentation

http://www.loc.gov/standards/mix/mix.xsd.

 

While a number of elements are 'Mandatory' in the Dictionary (e.g. CompressionScheme)

All elements are minoccurs=”0” in the Schema (i.e. Optional)

 

Any feedback gratefully received

 

Regards,

 

Hervé L’Hours