Structures for Storing Geographic Data - Introducing Geographic Information Systems with ArcGIS - page 278

fire hydrants are highly accurate, but that the locations of the water lines are less well known. Therefore,
we will give Fire_Hydrants a higher rank (lower number), so their coordinate representations will not
change.
6. Leave the number of possible ranks at 5. Change the rank of Water_Lines to 2. Leave the rank
of Fire_Hydrants at 1. See Figure 4-24. Click Next.
FIGURE 4-24
Topology Rules
Geodatabase topology is based on rules that define the required spatial relationship between two feature
classes, or sometimes specify a requirement within one feature class. For example, a rule might be that
no two polygons may overlap each other. Currently, there are thirty-some rules defined in the software.
Below you will choose a rule that says that the points of one feature class must be covered by (that is,
have a point coincident with) a feature in a given line feature class.
7. Press Add Rule. In the Add Rule window, select Fire_Hydrants in the Features of feature class
drop-down menu. Click the down arrow in the Rule text box to see the rules. There are six rules
that relate to point feature classes. List them below:
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