由运算符—通常和您在正则表达式中看到的符号相同—来指定小部件在较大的部件中出现的频率和顺序。
The frequency and order in which small parts may occur in larger parts is specified by operators — mostly the same symbols you see in regular expressions.
过滤条件可以指定为列名，其后跟等式、不等式或布尔运算符，然后是过滤值。
Filter criteria are specified as the column name, followed by an equality, inequality, or Boolean operator, followed by the filter value.
如果需要，可以使用instance of运算符来确定指定的目的地子类型。
If required, the instanceof operator can be used to determine the specific destination subtype.
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