PCDATA 和 CDATA

PCDATA
　　parsed character data
　　Parsed Character Data, representing the parsed character data, text data should be interpreted as parsed by the XML parser

　　XML normally parse all the text in an XML document
　　When an XML element is parsed, the text between the tags it will be resolved, such as:

<message>This text is also parsed</message>

 

　　In the following example, <name> element contains two additional elements of first and last,

<name><first>Bill</first><last>Gates</last></name>

　　The parser will break it down into the following this:

<name>
    <first>Bill</first>
    <last>Gates</last>
</name>

 

CDATA

　　Character Data, represent (unresolved) character data, can be understood as textual data should not be parsed by the XML parser

　　All text in an XML document will be parsed by the parser, but the text in the CDATA section except

　　Like "<" and "&" characters are illegal in XML element
　　　　"<" will generate an error because the parser will interpret the character as the start of the new element
　　　　"&" will generate an error because the parser will characters are interpreted as the start character entities
　　Thus, for example, it contains a lot of "<" or "&" character in the JavaScript code in
　　order to avoid parsing errors, script code is defined as CDATA
　　so, all content CDATA section will be parser ignore

　　Format:
　　　　CDATA portion "<[Start CDATA [!", A "]]>" from the end

　　　　<! [CDATA [
　　　　　　...
　　　　　　overlooked parser character
　　　　　　...
　　　　]]>

<Script> 
    ! < [CDATA [
         function matchwo (A, B)   // whole experience matchwo function is ignored by the parser 
        {
             IF (A <B && A <0 ) the then 
            { 
                return . 1 ; 
            } 
            the else 
            { 
                return 0 ; 
            } 
        } 
    ] ] > 
</ Script>

Notes on CDATA section:
　　CDATA section can not contain the string "]]>", does not allow nested CDATA section
　　end CDATA section labeled "]]>" can not contain spaces or line