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<DIV class=pt10><B>3.1.2.4 重復元素</B></DIV>
<DIV></DIV><BR>
<DIV class=pt9>
<P>讓我們再把上節的例子作一個小小的改動，你能不能猜到下面這段DTD是什么意思？</P>
<DIV align=center>
<CENTER>
<TABLE width="80%" border=1>
<TBODY>
<TR>
<TD width="100%"> <!ELEMENT 聯系人(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>讓我們看看前面給出的正則表達式的元字符集列表，現在猜到了嗎？對了！它說明一個“聯系人”元素中必須含有一個“姓名”元素，后面接一個或多個“EMAIL”元素。這樣，下面的這段XML文件是“有效的”。</P>
<DIV align=center>
<CENTER>
<TABLE width="80%" border=1>
<TBODY>
<TR>
<TD width="100%"><聯系人><BR>
<姓名>張三</姓名><BR>
<EMAIL>zhang@aaa.com</EMAIL><BR>
<EMAIL>zhang@hotmail.com</EMAIL><BR>
<EMAIL>zhang@yahoo.com</EMAIL><BR></聯系人></TD></TR></TBODY></TABLE></CENTER></DIV>
<P>那么下面這段XML文件呢？</P>
<DIV align=center>
<CENTER>
<TABLE width="80%" border=1>
<TBODY>
<TR>
<TD width="100%"><聯系人><BR>
<姓名>張三</姓名><BR></聯系人></TD></TR></TBODY></TABLE></CENTER></DIV>
<P>不錯，這個片段不是有效的，因為它沒有“EMAIL”元素，而“<FONT
color=#ff0000><STRONG>+</STRONG></FONT>”代表了“一個或多個”。</P>
<P>如果你需要表示“零個或多個”，那么應該使用字符“<FONT
color=#ff0000><STRONG>*</STRONG></FONT>”。例如：</P>
<DIV align=center>
<CENTER>
<TABLE width="80%" border=1>
<TBODY>
<TR>
<TD width="100%"> <!ELEMENT 聯系人(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>
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