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<h3 class="std">4.3.2 Constraint</h3>

      <p class="std">
        Any object or property may have associated constraints
        indicating a qualitative objective or a quantitative metric
        to be met.
      </p>

      <p class="std">
        Constraints based on metrics are measurable, such that the
        status of a metric being valid is computer-interpretable.
        Metric constraints are based on simple conditional logic
        such as greater than a particular value or included within
        a specified list or table. Constraints may be combine
        multiple metrics using boolean logic such as AND, OR, XOR,
        or NOT.
      </p><p>Figure 7 illustrates an instance diagram.</p>
<table><tr><td><img alt="Constraint" src="diagrams/constraint.png" usemap="#f7"><map name="f7"><area shape="rect" coords="8,8,176,152" href="../ifckernel/lexical/ifcobjectdefinition.html" alt="IfcObjectDefinition" /><area shape="rect" coords="208,8,376,104" href="../ifccontrolextension/lexical/ifcrelassociatesconstraint.html" alt="IfcRelAssociatesConstraint" /><area shape="rect" coords="408,8,576,20" href="../ifcmeasureresource/lexical/ifclabel.html" alt="IfcLabel" /><area shape="rect" coords="408,32,576,200" href="../ifcconstraintresource/lexical/ifcobjective.html" alt="IfcObjective" /><area shape="rect" coords="608,8,776,176" href="../ifcconstraintresource/lexical/ifcmetric.html" alt="IfcMetric" /><area shape="rect" coords="808,8,976,20" href="../ifcconstraintresource/lexical/ifcbenchmarkenum.html" alt="IfcBenchmarkEnum" /></map></td></tr><tr><td><p class="figure">Figure 7 &mdash; Constraint</p></td></tr></table>

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