<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE teaching-plan SYSTEM "plan.dtd">

<!-- 教学计划 -->

<teaching-plan>

<course no="01">

<course-name>大学英语</course-name>

<class-hour>36</class-hour>

<exam-form>考试</exam-form>

</course>

<course no="02">

<course-name>高等数学</course-name>

<class-hour>70</class-hour>

<exam-form>考试</exam-form>

</course>

<course no="03">

<course-name>计算机应用基础</course-name>

<class-hour>108</class-hour>

<exam-form>上机考试</exam-form>

</course>

</teaching-plan>

<?xml version="1.0" encoding="UTF-8"?>

<!ELEMENT teaching-plan (course+)>

<!ELEMENT course (course-name,class-hour,exam-form)>

<!ATTLIST course no CDATA "">

<!ELEMENT course-name (#PCDATA)>

<!ELEMENT class-hour (#PCDATA)>

<!ELEMENT exam-form (#PCDATA)>

另外

<!ATTLIST course no CDATA "">这句话是什么意思？