Part of the process of defining the model was to standardize on a set of common metadata properties (such as title, description, authors, and so on) which are common across all content types.
定义模型的部分过程是标准化一组通用元数据属性（如标题、说明和作者等），这些属性是所有内容类型中所通用的。
The description is based on constraints and called constraint model, which is defined by the features that satisfy a definite constraint set.
模型描述是基于约束的，故称为约束模型，并定义为满足一定约束关系集的特征集合。
Digital Terrain Model is a general designation of space topographical data set, and it is the digital description with the figure of space position and topographical attributive character.
数字地形模型是空间地形数据集合的统称，是具有空间位置特征和地形属性特征的数字描述。
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