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- We noticed that, although ART-DECOR states that the attributes are optional, the XSD states that it's mandatory.
The schema error is correct, as the attribute is required as per W3C schema (and that makes sense for the classCode).
Therefore you MUST specify this in the template as 1..1, either fixed or with a value set of valid class codes.
- Change the cardinality from 0 .. 1 to 1 .. 1