进一步研究了概念设计阶段的模块化装配设计，并在分析了装配约束分类的基础上实现装配约束建模。
Further, the paper study modular assembly design in the conceptual design step, and make assembly constraint modeling through constraint classification.
通过一系列派生形成的元素分类越来越具体，可能约束越来越多，总是严格地与一致的处理和呈现模型联系在一起。
Classification of elements through a sequence of derivations that are progressively more specific, possibly more constrained, and always rigidly tied to a consistent processing or rendering model.
OWL Lite 可以为那些主要需要一种分类层次和简单约束特性的用户提供很好的支持。
OWL Lite supports those users primarily needing a classification hierarchy and simple constraint features.
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