position函数计数节点—元素和文本节点—即使文本只是空白。
The position function counts nodes-both elements and text nodes-even if the text is just white space.
与计数函数类似，当在一个规则中使用多个具有分组关键字的聚合，对分组与计数操作必须进行级联，如图14所示。
Like the counting function, when several aggregations with grouping keys are used in a rule, the group and count operations must be cascaded as shown in figure 14.
但是，如果使用具有相同分组关键字的多个聚合，或者对相同列进行计数的计数函数，其不会显著增加规则的执行时间。
But if you use multiple aggregations with the same grouping keys, or multiple counting functions that count the same column, it will not significantly increase the execution time of the rule.
影响任务复杂性的相关要素是不同分组关键字的数量，而不是在计数函数中所看到的，不同的所聚合列的数量。
The relevant factor that impacts the complexity of the job is the number of different grouping keys, not the number of different aggregated columns that you would see in counting functions.
不过，当您使用某个采用引用计数的数据结构时，您必须记得运行引用计数函数。
However, you must remember to run the reference counting functions whenever you are using a reference-counted data structure.
注意，如果多个计数函数或测试在同一列上运行，那么排序与计数操作仅需做一次。
Note that if several counting functions or tests operate on the same column, then the sort and count operations only need to be done once.
这个函数会挂起调用线程，直到这个信号量有一个非空计数为止。
This function suspends the calling thread until the semaphore has a non-zero count.
要求您永远不要忘记调用引用计数函数。
It requires that you never forget to call the reference counting functions.
该函数然后返回计数器的值。
此函数不对事件的当前实例计数。
This function does not count the current instance of the event.
map函数发出每个单词附有一个相关的出现次数计数。
The Map function emits each word plus an associated count of occurrences.
首先，开发人员不得不重写numberOfSections函数来返回正确的计数。
First, one has to override the numberOfSections function to return the correct count.
可利用如下函数及测试来计数一个列中值的数量
You can use the following functions and tests to count the number of values in a column
Reduce函数对发出的特定单词计数求和。
The Reduce function sums together all counts emitted for a particular word.
URL访问计数：map函数处理web页面的请求日志。
Count of URL Access Frequency: The map function processes logs of web page requests and outputs.
最后还需要对这些节点计数，XPath提供了count函数。
Finally, you want to apply a count of those nodes, which XPath lets you conveniently do with the count function.
引用计数很简单，但是需要编译器的重要配合，并且增加了赋值函数(mutator)的开销(这个术语是针对用户程序的，是从垃圾收集器的角度来看的)。
Reference counting is simple, but requires significant assistance from the compiler and imposes overhead on the mutator (the term for the user program, from the perspective of the garbage collector).
Xdebug将在49次函数调用后介入并得到图2(顺便说一句，main的初始调用用于启动程序计数作为第1次调用)。
Xdebug intervenes after 49 function calls and yields Figure 2. (By the way, the initial invocation of main to launch the program counts as the first frame.)
清单2显示了这个继承树(为了清晰起见，删除了实例计数器和构造函数代码)。
Listing 2 shows the inheritance tree (with the instance counter and constructor code removed for clarity).
每个条目显示调用函数的次数和关于函数调用的处理时间的统计数据。
Each entry shows the number of times that the function was called and statistics on the processing time for the function call.
查询用在PDH函数调用中更新它管理的计数器，因而获取性能数据。
Queries are used within PDH function calls to update the counters it manages, thereby obtaining performance data.
对于不报告计数器值的任何输出列(例如基于状态的输出)，包装器直接返回底层监控表函数产生的数据，不做修改。
Any output columns that do not report counter values (for example, state based output) are returned directly from the underlying monitoring table function with no modification by the wrapper.
另外，内置函数和第三方的库不会知道或者可以使用您的引用计数机制。
Also, built-in functions and third-party libraries will not know about or be able to use your reference-counting mechanism.
函数的统计数据也不备份。
实际的聚集计算是通过DB2的max函数实现的，它使用这个经过编码的计数器找到最新的中间结果。
The actual aggregation is done by DB2's MAX function, which USES the encoded counter to find the last intermediate result.
返回给DB2的中间结果中包含着常用的计数器(DB 2max函数需要)，以及当前分组到目前为止计算出来的实际加权平均数。
The intermediate result that is returned to DB2 contains the usual counter (needed for the DB2 MAX function) and the actual weighted average that we have so far for the current group.
这个二进制串由常用的计数器(DB 2max函数进行实际聚集计算时需要)、聚集对象的标识以及分组标识构成。
This binary string is comprised of the usual counter, which is needed for the DB2 MAX function to do the actual aggregation, the identifier for the aggregate object, and the group identifier.
每次使用函数或者测试时，必须依照所计数列对数据集进行排序。
Each time you use such a function or test, the data set must be sorted by the counted column before the occurrences of the values can be counted.
每次使用函数或者测试时，必须依照所计数列对数据集进行排序。
Each time you use such a function or test, the data set must be sorted by the counted column before the occurrences of the values can be counted.
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