The Representation item type is a classification that describes the symbology and graphical relationships of an item’s representation on the drawing. Every appearance of a Model item type on a drawing is recorded as the association of the ModelItem item type with a unique Representation item type. Any number of Representation item types may be associated with a ModelItem item type to indicate each depiction of the model item in a drawing. The Drawing data category holds all the classes strictly involved with the representation of items on a given drawing.
There are four types of representations:
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LabelPersist
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Symbol
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Connector
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BoundedShape