Fig. 4. Evoland policy editor. The policy editor integrates GIS functionality and the Evoland spatial query language. The yellow-hatching in the figure shows where on the landscape the policy is admissible. In this policy, the hatching identifies rural land that is suitable for development. The yellow-hatched parcels are selected by the site attribute query, an expression similar to an SQL Select statement. The policy editor assists the analyst in writing policies in the Evoland spatial query language.