摘要：
DTD文件: (test.dtd)<!ELEMENT Products (Product)+><!ELEMENT Product (ProductName)+><!ATTLIST Product ProductID CDATA #REQUIRED><!ELEMENT ProductName (#PCDATA)>ENTITY文件:(test.ent)<!ENTITY ldquo "A"><!ENTITY rdquo "B">XML文件:(test.xml)<?xml versio 阅读全文
