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As specified, it gets a value when an Attribute Declaration has a value constraint but not when an Attribute Use has one. Either we should 1) Deprecate this in 1.0 and remove it from 1.1 (what use is it, anyway -- why is it here?); 2) Add a Note about its half-brokenness; 3) 'fix' it, pbly by moving it under Complex Type Defn PSVI contributions and folding in Attribute Uses.