A compound polygon is like a polygon, except that the line segments that form the polygon can have different line attributes. For example, a compound polygon can show a building (closed polyline) with one subterranean wall segment that is drawn with a dotted line.
PARENT feature class = Polygon feature class: Data of this feature class is saved redundantly. It is a standard polygon feature class. If the associated line strings do not frame a polygon, no polygon is saved. The essential feature attribute data is stored in the parent feature class.
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Default Attributes of the Compound Polygon Feature Class (Parent Polygon) |
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FID |
Primary key |
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GEOM |
For more information, see Oracle Spatial Users Guide and Reference. |
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AREA |
Calculated area. |
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INVALID_GEOMETRY_ERROR |
Oracle error code if polygon geometry is not valid. |
CHILD feature class = Line string feature class (child, single segments): This is a standard line string feature class with an additional column for a reference to the polygon feature class (FID_PARENT). Its name indicates the related polygon, for example "Single Segment [<compound name>]" or <compound name>_L. Normally the child line strings have few attributes, but can have one to control representation in graphics, such as "LINE_TYPE".
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Default Attributes of the Compound Polygon Feature Class (Child Line String) |
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FID |
Primary key |
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GEOM |
For more information, see Oracle Spatial Users Guide and Reference. |
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LENGTH |
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FID_PARENT |
Foreign key to parent polygon feature. |