外部DTD和实体验证XML

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 version="1.0" encoding="utf-8" ?> <!DOCTYPE Products SYSTEM "test.dtd" [

<!ENTITY % test SYSTEM "test.ent">

%test;   <!--加载外部实体-->

]>

<Products>

<Product ProductID="123">   

<ProductName>Rugby</ProductName>   

<ProductName>&ldquo; is &rdquo;</ProductName>

</Product>

</Products>