Model constraints are constraints that restrict models and their elements, further elaborating the intentions of the modeler.

模型约束是限制模型及其元素的约束，并进一步精化建模者的意图。

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This security model allows administrators to restrict access to trusted origins in a very flexible way.

该安全性模型允许管理员以一种非常灵活的方式，来限制对受信任站点的访问。

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The goal of this tutorial is to add textual constraints in OCL to restrict undesired instances of the model, and thus reach higher levels of maturity (See the Resources [1] section for more details).

本教程的目的是添加ocl的文本约束条件来限制模型的非期望的实例，并且因而达到更高的成熟级别(参见参考资料[1]，了解更多详情)。

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In Seattle, Sargent met with Russ Grandinetti, the vice-president in charge of Kindle Content, and told him that if Amazon would not accept the agency model Macmillan would restrict the publication of its e-books.

NEWYORKER: Publish or Perish