26.2.xml

这是我卖的书上的源码 这书是电子邮电出版的是有关网络编程 有详细的例子

<?xml version="1.0"?>
<!DOCTYPE combomeal 
[
<!ENTITY cola "Pepsi">
<!ELEMENT combomeal (burger+, fries+, drink+)>
<!ELEMENT burger (name, bun)>
<!ELEMENT name (#PCDATA)>
<!ELEMENT bun (meat+, cheese+, meat+)>
<!ATTLIST bun bread (white | wheat) #REQUIRED>
<!ELEMENT meat EMPTY>
<!ELEMENT cheese EMPTY>
<!ELEMENT fries EMPTY>
<!ATTLIST fries size (small | medium | large) #REQUIRED>
<!ELEMENT drink (#PCDATA)>
<!ATTLIST drink size (small | medium | large) #REQUIRED>
]>
<!-- the document instance -->
<combomeal>
   <burger>
   <name>Tasty Burger</name>
   <bun bread="white">
      <meat />
      <cheese />
      <meat />
   </bun>
   </burger>
   <fries size="large" />
   <drink size="large">&cola;</drink>
</combomeal>