comp320/lab7/Library2.xsl
comp320/lab7/dtd3.xml
comp320/lab7/dtd2.xml
comp320/lab7/dtd1.xml
? = optional
* = can or can not or null
+ = at least 1
//NMTOKEN ,can not user speacil char , #REQUIRED can not null // | = or , by default = "CD" ]> <book isbn = "123-4567-8-A">
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