A property alteration.
Created by calling AlterLines.Add.
Contained by the property alteration definition of a query, an AlterLines collection.
AlterLine objects represent the simple property alterations; for example, a change of color. Text and hatch alterations, which add text labels and apply hatch patterns to queried objects, are represented by two additional objects, TextDef and HatchDef. A property alteration definition can contain any of the three.
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