SysML-1.6: Figure D.31 has constraint parameter 'vc' on ':CapacityEquation', which is inconsistent w.r.t. parameters 'V1', 'V2', 'V3' and constraint {pcap=Sum(Vi)) shown in Figure D.26.
The usage of a constraint block is distinguished from other parts by a box having rounded corners rather than the square corners of an ordinary part. Source OMG Systems Modeling Language (SysML) 1.6
A constraint block is defined by a keyword of «constraint» applied to a block definition. Properties of this block define parameters of the constraint, with the exception of properties that hold internally nested usages of constraint blocks. Source OMG Systems Modeling Language (SysML) 1.6
A constraint property may be shown on a parametric diagram using a rectangle with rounded corners. This graphical shape distinguishes a constraint property from all other properties and avoids the need to show an explicit «constraint» keyword. Otherwise.. Source OMG Systems Modeling Language (SysML) 1.6
