Since you can set any arbitrary attribute value (and yes, that includes values that you define) to a constraint expression or use it in a constraint, there are a lot of possibilities.
由于可以为约束表达式设置任何任意的属性值(包括您自己定义的值)，或者在约束中使用它，因此存在很多可能。
The schema constraint count(key('ids', .)) = 1 checks the set of all identifiers to be sure that only one has the current value (in other words whether the identifier is unique).
模式将限定count(key('ids',.) ) =1检查所有的标识符，从而确保只有一个包含当前值（换句话说，确定该标识符是否是惟一的）。
Now you set the store ID and supplier ID fields so that they do not accept an empty value. Of course, you can add a schema constraint into the XForms model to achieve this.
现在，设置storeID和supplier ID字段以使这两个字段不接受空值。
Meanwhile, the model for parts' value optimization is set up with objective cost as constraint, and the cost matched with function can be obtained.
同时以目标成本作为约束，建立零部件的价值优化模型，找出与其功能相匹配的成本。
Check the Horizontal Center in Container, ensuring the value is set to 0, and click Add 1 Constraint.
检查水平中心的集装箱，以确保该值设置为0，然后单击添加1约束。
Check the Horizontal Center in Container, ensuring the value is set to 0, and click Add 1 Constraint.
检查水平中心的集装箱，以确保该值设置为0，然后单击添加1约束。
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