student.dtd
<!ELEMENT students (student+) >
<!ELEMENT student (name,age,sex)>
<!ELEMENT name (#PCDATA)>
<!ELEMENT age (#PCDATA)>
<!ELEMENT sex (#PCDATA)>
<!ATTLIST student number ID #REQUIRED>
student.xml
<?xml version=”1.0″ encoding=”UTF-8″ ?>
<!DOCTYPE students SYSTEM “student.dtd”>
<!–<!DOCTYPE students [
<!ELEMENT students (student+) >
<!ELEMENT student (name,age,sex)>
<!ELEMENT name (#PCDATA)>
<!ELEMENT age (#PCDATA)>
<!ELEMENT sex (#PCDATA)>
<!ATTLIST student number ID #REQUIRED>
]>-->
<students>
<student number="s001">
<name>zhangsan</name>
<age>abc</age>
<sex>hehe</sex>
</student>
<student number="s002">
<name>lisi</name>
<age>24</age>
<sex>female</sex>
</student>
</students>