通过对问题或者解决方案域中一个特定主题相对应的元素进行分组，逻辑上划分和组织模型信息。
Logically partitioning and organizing model information within a model by grouping elements that correspond to a specific subject matter in the problem or solution domain.
复杂的分类法(允许在逻辑上对分类信息进行分组，例如，按照纬度和经度)。
Complex categorization (allowing categorization information to be logically grouped — for example, latitude and longitude).
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