A relationship \ .\ ``relationship``\ .\  ``dir1:from_to`` \ .\ ``entity``\ .\  ``dir2:from_to`` \ .\ ``other_entity``\ .\ 
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Usages:
~~~~~~~

 - **Given** *a relationship .IfcRelNests. from .IfcAlignment. to .IfcAlignmentHorizontal.*

   :doc:`/features/ALB000_Alignment-layout`:14

 - **Given** *a relationship .IfcRelNests. from .IfcAlignment. to .IfcObject.*

   :doc:`/features/ALB031_Alignment-layouts-default-case`:16

 - **Given** *a relationship .IfcRelAggregates. from .IfcAlignment. to .IfcAlignment.*

   :doc:`/features/ALB032_Alignment-layouts-reusing-horizontal`:16

 - **Given** *a relationship .IfcRelNests. from .IfcAlignment. to .IfcObject.*

   :doc:`/features/ALB032_Alignment-layouts-reusing-horizontal`:17

 - **Given** *a relationship .IfcRelNests. from .IfcAlignment. to .IfcObject.*

   :doc:`/features/ALB032_Alignment-layouts-reusing-horizontal`:23

 - **Given** *a relationship .IfcRelDefinesByType. to .IfcDoor. from .IfcDoorType.*

   :doc:`/features/BLT001_Correct-use-of-operation-type-attributes-for-doors`:29

 - **Given** *a relationship .IfcRelDefinesByType. to .IfcWindow. from .IfcWindowType.*

   :doc:`/features/BLT002_Correct-use-of-partitioning-type-attributes-for-windows`:29

 - **Given** *a relationship .IfcRelAssignsToGroup. from .IfcGroup. to .IfcObject.*

   :doc:`/features/GRP000_Groups`:10

 - **Given** *a relationship .IfcRelAggregates. to .IfcElement. from .IfcElement.*

   :doc:`/features/SPS007_Spatial-containment`:34