XML——基本结构（作业）

<?xml version="1.0" encoding="utf-8" standalone="yes" ?>
<!DOCTYPE Students[
    <!ENTITY Title "学生信息">

    <!ELEMENT title (#PCDATA)>

    <!ELEMENT sname (#PCDATA)>
    <!ELEMENT sex (#PCDATA)>      <!-- 节点 -->
    <!ELEMENT age (#PCDATA)>
    <!ELEMENT phone (#PCDATA)>
    <!ELEMENT address (#PCDATA)>

    <!ELEMENT baseinfo (sname, age, sex)>
    <!ATTLIST baseinfo sexid (男|女) #REQUIRED>  <!-- 属性 -->

    <!ELEMENT student (title, baseinfo, phone, address)>
]>
<Students>
    <title> &Title; </title>
    <student>
        <baseinfo sexid="男">
            <sname>张三</sname>
            <age>25</age>
            <sex>男</sex>
        </baseinfo>

        <phone>15236936958</phone>
        <address>河南新野</address>
    </student>

    <title> &Title; </title>
    <student>
        <baseinfo>
            <sname>刘志东</sname>
            <age>5</age>
            <sex>男</sex>
        </baseinfo>

        <phone>15236936958</phone>
        <address>河南新野</address>
    </student>
</Students>