策略表达式既允许使用简单的声明性断言，也允许使用更为复杂的条件断言。
Policy expressions allow for both simple declarative assertions as well as more sophisticated conditional assertions.
很简单，indexer让用户定位文档时，很难甚至无法以规则表达式来指定搜索条件，并且快速的执行。
Quite simply, indexer allows one to locate documents using search criteria that may be difficult or impossible to specify as a regular expression, and to do so quickly.
像条件语句一样，它允许一个简单的语句位于分支的表达式之前。
Like conditionals, they allow a simple statement to proceed the expression that is being switched upon.
XML查询包含内容查询和结构查询，其查询条件可表示为简单路径表达式(SPE)和正则路径路径表达式(RPE)。
XML query includes content query and structural query. The query condition can be represented as a simple path expression (SPE) or a regular path expression (RPE).
本文采用较简单易懂的数学方法由洛仑兹系数γ直接导出相对论条件下的功和动能的表达式。
This paper uses a rather simple and easy understanding method to directly derivework and work energy expression under the conditions of Relativity theory conditionfrom Lorrentz factor Y.
学习正则表达式最有挑战的地方在于用简单的符号来表达像条件，迭代等这些概念。
Perl language itself. In fact, the main challenge in learning regular expressions is just getting used to the terse notation used to express these concepts.
可创建简单的约束表达式，用简单条件检查数据；
You can create a simple constraint expression to check data for a simple condition;
可创建简单的约束表达式，用简单条件检查数据；
You can create a simple constraint expression to check data for a simple condition;
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