Well, let's look at the differential — — of this constraint quantity.

来看一下这个约束量的微分。

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The second thing that we want to do is we want to look at the constraint.

我们要做的第二件事是，来看看约束条件。

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Part 2 (January 2009) : Look at the co-constraint mechanisms, specifically the new assertions and type alternatives features.

第2部分：XML Schema 1.1简介(2009年1月)：检查这个协同制约机制，特别是新断言和类型替代特性。

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