本文以地图符号的视觉变量和地图要素的表示等级为依据，详细介绍了地图设计专家系统中点状符号设计的推理模型。
On the basis of the visual variables of map symbol and the represent grade of map elements, this paper introduces the inference model of point symbol design in map design Expert System.
一种符号，用来表示数学运算过程，描述系统的一些输入变量和输出变量之间的关系和限制。
A symbol that indicates a mathematical process, describes the relations and restrictions that exist between the input variables and the output variables of a system.
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