地质符号一般均有其特定的图形特征和表示意义，用以表达地质制图中所涉及的具体或抽象的地质对象。
Geological symbols generally have the specific graphical features and geological significances and can be used to present some concrete or abstract objects in geological drawing.
它主要涉及到两部分问题的解决：首先是如何表示对象内部的数据；
It has two problems to be solved: First, how to represent object's internal data in form of relational tables;
它主要涉及到两部分问题的解决：首先是如何表示对象内部的数据；
It has two problems to be solved: First, how to represent object's internal data in form of relational tables;
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