If a restriction value is not passed in, the default values are used for that restriction.
如果限制值未传入，则会使用该限制的预设值。
In this case, the restriction selects all resources that have an issue property where the value of that property is of class issue.
在这个例子里，约束条件选择所有具有issue特性并且该特性的值属于类issue的资源。
The value space of the dayTimeDuration datatype is a restriction of the value space of the duration datatype with a months property value of zero and a fractional seconds value.
dayTimeDuration 数据类型的值空间是对 duration 数据类型的一种限制，其月属性值为 0，并具有一个小数形式的秒数值。
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