The value of attribute \ .\ ``attribute``\ .\  must be \ ^\ ``value_or_comparison_op``\ ^\ 
===========================================================================================

.. container:: prewrap

   | Compare an attribute to an expression based on attributes.
   | 
   | The {comparison_op} operator can be 'equal to', 'not equal to', 'greater than', 'less than', 'greater than or equal to', and 'less than or equal to'.
   | 
   | The {expression} should be composed by attribute values, and use the following operators:
   | + : addition;
   | - : subtraction;
   | * : multiplication;
   | / : division;
   | % : modulus;
   | ** : exponentiation.

Usages:
~~~~~~~

 - **Then** *The value of attribute .RadiusOfCurvature. must be ^empty^*

   :doc:`/features/ALB012_Alignment-vertical-segment-radius-of-curvature`:18

 - **Then** *The value of attribute .WellKnownText. must be ^not empty^*

   :doc:`/features/GRF006_WKT-specification-for-missing-EPSG`:17

 - **Then** *The value of attribute .WellKnownText. must be ^not empty^*

   :doc:`/features/GRF006_WKT-specification-for-missing-EPSG`:25

 - **Then** *the value of attribute .CartesianPosition. must be ^not empty^*

   :doc:`/features/LIP002_Linear-placement-fallback-coordinates`:14

 - **Then** *The value of attribute .ObjectType. must be ^not empty^*

   :doc:`/features/OJT001_Object-predefined-type`:17

 - **Then** *The value of attribute .ElementType. must be ^not empty^*

   :doc:`/features/OJT001_Object-predefined-type`:22

 - **Then** *The value of attribute .ContainedInStructure. must be ^empty^*

   :doc:`/features/SPS003_Correct-containment-of-assemblies`:12

 - **Then** *The value of attribute .PositionedRelativeTo. must be ^empty^*

   :doc:`/features/SPS004_No-combination-of-containment-and-positioning`:14

 - **Then** *The value of attribute .ContainedInStructure. must be ^empty^*

   :doc:`/features/SPS004_No-combination-of-containment-and-positioning`:23

 - **Then** *The value of attribute .ReferencedInStructures. must be ^not empty^*

   :doc:`/features/SPS006_Elements-referenced-in-Spatial-structures`:14