当指定ELEMENT指令检索以元素为中心的XML时，如果列具有NULL值，则EXPLICIT模式将不生成相应的元素。
When you specify the element directive to retrieve element-centric XML, if the column has a NULL value, the corresponding element is not generated by the EXPLICIT mode.
TS(跟踪选择，Trace Selection)，每当样式表伪指令执行select操作以从源文档检索数据时就生成一条消息。
TS (Trace Selections) produces a message each time a stylesheet directive performs a select operation to retrieve data from the source document.
该处理器的工作就是检索指令和操作数从记忆并执行每个操作。
The processor's job is to retrieve instructions and operands from memory and to perform. each operation.
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