一个从需求开始的典型模型可能还会包括结构化的表达交流的分类模型。
A typical model that started as just requirements may also include structural classifier models that express interactions.
结合地图符号的结构特征和SVG的表达方法，提出了基于SVG结构化的地图符号描述模型。
Integrating the character of map symbol and SVG, this paper presents a description model of map symbol based on SVG.
它提供了语义级的数据导航和组织方式，是一个表达和交换结构化信息的元数据模型。
As a data model of describing and exchanging information, they provide a way of navigating and organizing semantic data.
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