Now add a count to the element and set the value to 2. The rule is defined that counts the active selected elements and returns true if two elements are selected.
现在向元素中添加计数并把值设置为2。
Jelliffe's formula was a count of element types, attributes, and various special cases of these measured either from a DTD or from one or more instance documents.
Jelliffe的公式是计算元素类型、属性和各种特殊情况的个数，可以使用DTD或者一个或多个实例文档。
For example, suppose you want to perform a count of the rows where the XML data column has an element text with the value This should validate!.
例如，假设您想要计算其XML数据列的text元素的值为Thisshould validate ！的行的数量。
Spu_rlmask and spu_rlmaska shifts each element of val to the right by the number of bits in the corresponding element of count (or the value of count if count is a scalar).
spu_rlmask和spu_rlmaska会将val的每个元素向右移位，移动的位数是在count中的对应元素中指定的(如果count是一个标量，移动的位数就是count的值)。
Spu_rlmask and spu_rlmaska shifts each element of val to the right by the number of bits in the corresponding element of count (or the value of count if count is a scalar).
spu_rlmask和spu_rlmaska会将val的每个元素向右移位，移动的位数是在count中的对应元素中指定的(如果count是一个标量，移动的位数就是count的值)。
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