分析了矢量电子地图的现状，对采用面向对象的数据模型和数据结构实现矢量电子地图进行了研究。
This paper analyzes the current situation of vector electronic map and investigates the realization of vector electronic map with object-oriented data model and structure.
变化的业务需求不断地要求向关系数据模型或面向对象模型中添加新实体和关系。
From time to time, the demands of changing business needs require that you add new entities and relationships to the relational data models or object-oriented models.
它对于把XML数据模型化为对象也有很大的帮助，而且对您来说，使用Python的面向对象的结构做到这一点并不困难。
It can be very helpful to model XML data as objects, and you can easily use Python's object-oriented constructs to do just that.
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