catalog.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"?>
<!ELEMENT Catalog (CD*)>
<!ELEMENT CD (Title,Singer,Country,Company,Price,Year,Message,Code)>
<!ELEMENT Title (#PCDATA)>
<!ELEMENT Singer (#PCDATA)>
<!ELEMENT Country (#PCDATA)>
<!ELEMENT Company (#PCDATA)>
<!ELEMENT Price (#PCDATA)>
<!ELEMENT Year (#PCDATA)>
<!ELEMENT Message (#PCDATA)>
<!ELEMENT Code (#PCDATA)>