with a dot in the center, to signify "unique-and-mandatory-where-true" (a type of constraint introduced in the 2007 ORM Workshop paper "Reduction Transformations in ORM", by Halpin, Carver, and Owen, which used however an earlier notation). Halpin's and Matt Curland's 2013 ORM Workshop paper, "Recent Enhancements to ORM") and 3) use of the external U.C. Halpin's EMMSAD 2013 paper "Modeling of Reference Schemes") 2) "partial" preferred-identifier uniqueness constraint, for optional use on "part" of a disjunctive reference scheme that has an exclusion constraint between two or more of its optional components (see Dr. Version 22 had added three enhancements more-or-less recently made to ORM2 uniqueness-constraint shapes they are accessible here via the shape's context menu: 1) for external uniqueness constraints, setting of the join semantics to either inner join, outer join, or mixed (i.e., both inner and outer joins: see Dr. Version 23 adds the inequality value-comparison constraint.
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