Logical consistency

For any particular application, (predefined) logical rules (consistency) concern:

• the compatibility of data with other data in a data set (e.g. in terms of data format);

• the absence of any contradictions within a data set;

• the topological consistency of the data set; and

• the allowed attribute value ranges, as well as combinations of attributes. For example, attribute values for population, area and population density must agree for all entities in the database.

The absence of any inconsistencies does not necessarily imply that the data are accurate.