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Must Be Covered By (Area-Area)- Requires that polygons of one feature class (or subtype) must be contained within polygons of another feature class (or subtype).

The rule can also be applied to nonhierarchically related polygon feature classes, such as soil type and slope class. One such case occurs with nested hierarchical datasets, such as census blocks and block groups or small watersheds and large drainage basins. This rule is used when two systems of classification are used for the same geographic area, and any given point defined in one system must also be defined in the other. Any area defined in either feature class that is not shared with the other is an error.

Must Cover Each Other (Area-Area)- Requires that the polygons of one feature class (or subtype) must share all of their area with the polygons of another feature class (or subtype).

This rule is used when an area of one type, such as a state, should be completely covered by areas of another type, such as counties. An area in the first feature class that is not covered by polygons from the other feature class is an error.

Must Be Covered By Feature Class Of (Area-Area)- Requires that a polygon in one feature class (or subtype) must share all of its area with polygons in another feature class (or subtype).

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It is useful for modeling administrative boundaries, such as ZIP Codes or voting districts, and mutually exclusive area classifications, such as land cover or landform type.

This rule is used when an area cannot belong to two or more polygons. The polygons can share edges or vertices. Must Not Overlap (Area)- Requires that the interior of polygons not overlap.For example, soil polygons cannot include gaps or form voids-they must cover an entire area. Use this rule on data that must completely cover an area. You can either ignore this error or mark it as an exception. An error will always exist on the perimeter of the surface.

All polygons must form a continuous surface. Must Not Have Gaps (Area)- This rule requires that there are no voids within a single polygon or between adjacent polygons.

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