针对尺寸之间的关联约束，本文首先分析了尺寸链约束的特点，提出了基于尺寸链的尺寸环模型。

The characteristics to dimension chain constraint is analysed, dimension loop model is put forward based on the dimension chain for solving dimension relationship constraints.

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该元素描述要保护的页面集合和关联的安全约束。

This element describes the collection of pages to be secured and associated security constraints.

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每一个从a到b的关联都会覆盖前面一个，这些关联必须依赖处理约束的顺序。

Each association from a to B will overwrite the previous one, so the association generated from a to B will depend on the order in which the constraints are processed.

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