Description Klaas Gadeyne 2015-09-24 03:32:39 EDT

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10.3.1.2.3 Small square box notation for an internal property
A value property may optionally be shown by a small square box, with the name and other specifications appearing in a text string close to the square box. The text string for such a value property may include all the elements that could ordinarily be used to declare the property in a compartment of a block, including an optional default value. The box may optionally be shown with one edge flush with the boundary of a containing property. Placement of property boxes is purely for notational convenience, for example to enable simpler connection from the outside, and has no semantic significance. If a connector is drawn to a region where an internal property box is shown flush with the boundary of a containing property, the connector is always assumed to connect to the innermost property.
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Not particularly clear IMO, since the spec only talks of 'value properties' here, and not of "constraint parameters".  AFAICT The spec fails to give a formal definition of "constraint parameters", but it can be inferred from several places that 'value properties' in the context of a constraintBlock should be used to represent the constraint's parameters (see for instance the statements in bug #478259)

Table 10.2 shows how this should be done.  Especially for the constraint parameters, the 'flushed with boundary' port-like notation is always used consistently in the spec, see fi. Figure D24, D.31 and D.33 (nested constraint properties)