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<DIV class=pt10><B>3.1.2.4 重复元素</B></DIV>
<DIV></DIV><BR>
<DIV class=pt9>
<P>让我们再把上节的例子作一个小小的改动，你能不能猜到下面这段DTD是什么意思？</P>
<DIV align=center>
<CENTER>
<TABLE width="80%" border=1>
<TBODY>
<TR>
<TD width="100%"> <!ELEMENT 联系人(姓名，EMAIL<FONT
color=#ff0000><STRONG>+</STRONG></FONT>)><BR>
<!ELEMENT 姓名(#PCDATA)><BR> <!ELEMENT
EMAIL(#PCDATA)></TD></TR></TBODY></TABLE></CENTER></DIV>
<P>让我们看看前面给出的正则表达式的元字符集列表，现在猜到了吗？对了！它说明一个“联系人”元素中必须含有一个“姓名”元素，后面接一个或多个“EMAIL”元素。这样，下面的这段XML文件是“有效的”。</P>
<DIV align=center>
<CENTER>
<TABLE width="80%" border=1>
<TBODY>
<TR>
<TD width="100%"><联系人><BR>
<姓名>张三</姓名><BR>
<EMAIL>zhang@aaa.com</EMAIL><BR>
<EMAIL>zhang@hotmail.com</EMAIL><BR>
<EMAIL>zhang@yahoo.com</EMAIL><BR></联系人></TD></TR></TBODY></TABLE></CENTER></DIV>
<P>那么下面这段XML文件呢？</P>
<DIV align=center>
<CENTER>
<TABLE width="80%" border=1>
<TBODY>
<TR>
<TD width="100%"><联系人><BR>
<姓名>张三</姓名><BR></联系人></TD></TR></TBODY></TABLE></CENTER></DIV>
<P>不错，这个片段不是有效的，因为它没有“EMAIL”元素，而“<FONT
color=#ff0000><STRONG>+</STRONG></FONT>”代表了“一个或多个”。</P>
<P>如果你需要表示“零个或多个”，那么应该使用字符“<FONT
color=#ff0000><STRONG>*</STRONG></FONT>”。例如：</P>
<DIV align=center>
<CENTER>
<TABLE width="80%" border=1>
<TBODY>
<TR>
<TD width="100%"> <!ELEMENT 联系人(姓名，EMAIL<FONT
color=#ff0000><STRONG>*</STRONG></FONT>)><BR>
<!ELEMENT 姓名(#PCDATA)><BR> <!ELEMENT
EMAIL(#PCDATA)></TD></TR></TBODY></TABLE></CENTER></DIV></DIV>
<P></P>
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