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| ENTITY grid_of_structure;
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| grid_description
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OPTIONAL text;
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| grid_use
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OPTIONAL text;
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| gridlines
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SET [1:?] OF gridline := bag_to_set
(USEDIN(SELF,'STRUCTURAL_FRAME_SCHEMA.GRIDLINE.PARENT_GRID'));
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| grid_levels
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SET OF grid_level := bag_to_set
(USEDIN(SELF,'STRUCTURAL_FRAME_SCHEMA.GRID_LEVEL.PARENT_GRID'));
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| constituent_lines
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SET [1:?] OF gridline FOR parent_grid;
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