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from:
http://e-learning.zjgsu.edu.cn/jdk5doc_zh_CN/org/w3c/dom/ProcessingInstruction.html
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public interface ProcessingInstructionextends Node
ProcessingInstruction ½Ó¿Ú±íʾ“´¦ÀíÖ¸Á¬¸ÃÖ¸Áî×÷ΪһÖÖÔÚÎĵµµÄÎı¾Öб£³ÖÌØ¶¨ÓÚ´¦ÀíÆ÷µÄÐÅÏ¢µÄ·½·¨ÔÚ XML ÖÐʹÓá£
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Processing Instructions
Processing Instructions are information for the application. PI's allow documents to contain instructions for applications. They are not really of interest to the XML parser. Instead, the instructions are passed to the application using the parser, because the purpose of processing instructions is to represent special instructions for the application.
Like comments, they are not textually part of the XML document.
All processing instructions, including the XML declaration, begin with <? and end with ?>. Following the initial <?, you will find the name of the processing instruction. The PI begins with the PITarget  used to identify the application to which the instruction is directed.
<?name pidata?>
<?xml version="1.0"? encoding="UTF-8" standalone="yes"?>
Version Declaration is a form of PI.


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