/// Fourth entity for the constraint
const std::string CONSTRAINT_ATTR_ENTITY_D("ConstraintEntityD");
/// List of constraint attributes
-const std::string CONSTRAINT_ATTRIBUTES[4] =
+const unsigned int CONSTRAINT_ATTR_SIZE = 4;
+const std::string CONSTRAINT_ATTRIBUTES[CONSTRAINT_ATTR_SIZE] =
{CONSTRAINT_ATTR_ENTITY_A, CONSTRAINT_ATTR_ENTITY_B,
CONSTRAINT_ATTR_ENTITY_C, CONSTRAINT_ATTR_ENTITY_D};