The same rules for expressions in general apply to query expressions.
有关常规表达式的规则同样适用于查询表达式。
You can use variables for limited parameterization of schemata, by which I mean allowing for parts of the expressions within certain rules to be specified using code outside the rule itself.
可以使用变量限制模式的参数化，就是说用规则之外的代码确定特定规则内的部分表达式。
For convenience, WS-Policy defines both a normal-form expression of a policy and a set of rules you can use to create more-compact policy expressions.
为了方便起见，WS - Policy定义了一个标准形式的策略表达式和一组可以创建更紧凑的策略表达式的规则。
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