實例如下
<?xml version="1.0" encoding="UTF-8"?>
<!-- 內部聲明DTD -->
<!DOCTYPE scores[
<!ELEMENT scores (student+)>
<!ELEMENT student (name,course,score)>
<!ATTLIST student id CDATA #REQUIRED>
<!ELEMENT name (#PCDATA)>
<!ELEMENT course (#PCDATA)>
<!ELEMENT score (#PCDATA)>
]>
<scores>
<student id="1">
<name>www</name>
<course>java</course>
<score>66</score>
</student>
<student id="2">
<name>eee</name>
<course>php</course>
<score>77</score>
</student>
</scores>