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>> In XML Schema is it possible to express a constraint such as
>> "field1.maxLength + field2.maxLength must not exceed 50 characters"
>> without constraining any one field to less than 50 characters on it's
> No. Use Schematron for that.
Actually, there is a workaround.
When serializing the data into XML, generate a third element/attribute
containing field1 and field2 concatenated, and constrain that to < 50
characters in the schema. Throw this element or attribute away after
validation, by some custom magic.