example2.dtd

XML课件非常好的东西 如果你不了解XML看看非常有用

<?xml version="1.0" encoding="GB2312" ?>
<!ELEMENT TOUROPERATORS (OPERATOR+, TOUR+)>
<!ELEMENT OPERATOR (CODE,NAME, PHONE? ,EMAIL)>
<!ELEMENT CODE (#PCDATA)>
<!ELEMENT NAME (#PCDATA)>
<!ELEMENT EMAIL (#PCDATA)>
<!ELEMENT PHONE (#PCDATA)>
<!ELEMENT TOUR (RESORT,PRICE)>
<!ELEMENT RESORT (#PCDATA)> 
<!ELEMENT PRICE (#PCDATA)>
<!ATTLIST PRICE DAYS CDATA #REQUIRED>