面向概念的两级数据模型
Two-Level Concept-Oriented Data Model
摘要：
在本文中，我们描述了一种新的数据建模方法，称为面向概念的模型（CoM）。该模型以嵌套有序集的形式化为基础，利用包含关系产生集合的层次结构，利用有序关系产生元素之间的多维结构。嵌套有序集定义为一个有序集，其中每个元素本身可以是一个有序集。CoM中的排序关系用于定义数据语义和对数据的投影、反投影等操作。这种数据模型可以应用于非常不同的问题，本文描述了它的一些用途，如聚合和多维分析的分组。
英文摘要：
In this paper we describe a new approach to data modelling called the concept-oriented model (CoM). This model is based on the formalism of nested ordered sets which uses inclusion relation to produce hierarchical structure of sets and ordering relation to produce multi-dimensional structure among its elements. Nested ordered set is defined as an ordered set where an each element can be itself an ordered set. Ordering relation in CoM is used to define data semantics and operations with data such as projection and de-projection. This data model can be applied to very different problems and the paper describes some its uses such grouping with aggregation and multi-dimensional analysis.
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