根据下面指定的XML文件 进行递归 查询 每个节点。XML文件：<?xml version="1.0" encoding="utf-8"?>
<SectionInfo>
<section id="0" parentId="-1" title="计算机应用" url=""></section>
<section idd="1" id="1" parentId="0" title="模块一：计算机基础知识" url="1.htm?id=1"></section>
<section idd="1" id="2" parentId="1" title="单元一" url=""></section>
<section idd="1" id="3" parentId="2" title="第一小节" url="1.1.1.htm?id=3"></section>
<section idd="1" id="4" parentId="2" title="第二小节" url="1.1.2.htm?id=4"></section>
<section idd="1" id="5" parentId="2" title="第三小节" url="1.1.3.htm?id=5"></section>
<section idd="1" id="6" parentId="2" title="第四小节" url="1.1.4.htm?id=6"></section>
<section idd="1" id="7" parentId="1" title="单元二" url=""></section>
<section idd="1" id="8" parentId="7" title="第一小节" url="1.2.1.htm?id=8"></section>
<section idd="1" id="9" parentId="7" title="第二小节" url="1.2.2.htm?id=9"></section>
<section idd="1" id="10" parentId="1" title="单元三" url=""></section>
<section idd="1" id="11" parentId="10" title="第一小节" url="1.3.1.htm?id=11"></section>
<section idd="1" id="12" parentId="10" title="第二小节" url="1.3.2.htm?id=12"></section>
<section idd="1" id="13" parentId="10" title="第三小节" url="1.3.3.htm?id=13"></section>
<section idd="1" id="14" parentId="10" title="第四小节" url="1.3.4.htm?id=14"></section>
<section idd="1" id="15" parentId="10" title="第五小节" url="1.3.5.htm?id=15"></section>
<section idd="1" id="16" parentId="1" title="单元四" url=""></section>
<section idd="1" id="17" parentId="16" title="第一小节" url="1.4.1.htm?id=17"></section>
<section idd="1" id="18" parentId="16" title="第二小节" url="1.4.2.htm?id=18"></section>
<section idd="1" id="19" parentId="16" title="第三小节" url="1.4.3.htm?id=19"></section>
<section idd="1" id="20" parentId="16" title="第四小节" url="1.4.4.htm?id=20"></section>
<section idd="1" id="21" parentId="16" title="第五小节" url="1.4.5.htm?id=21"></section>
<section idd="1" id="22" parentId="16" title="第六小节" url="1.4.6.htm?id=22"></section>
<section idd="1" id="23" parentId="1" title="单元五" url=""></section>
<section idd="1" id="24" parentId="23" title="第一小节" url="1.5.1.htm?id=24"></section>
<section idd="1" id="25" parentId="1" title="单元六" url=""></section>
<section idd="1" id="26" parentId="25" title="第一小节" url="1.6.1.htm?id=26"></section>
<section idd="1" id="27" parentId="1" title="单元七" url=""></section>
<section idd="1" id="28" parentId="27" title="第一小节" url="1.7.1.htm?id=28"></section>
<section idd="1" id="29" parentId="27" title="第二小节" url="1.7.2.htm?id=29"></section>
<section idd="1" id="30" parentId="27" title="第三小节" url="1.7.3.htm?id=30"></section>
<section idd="31" id="31" parentId="0" title="模块二：Windows XP 操作系统" url="2.htm?id=31"></section>
<section idd="31" id="32" parentId="31" title="单元一" url=""></section>
<section idd="31" id="33" parentId="32" title="第一小节" url=""></section>
<section idd="31" id="34" parentId="32" title="第二小节" url=""></section>
<section idd="31" id="35" parentId="31" title="单元二" url=""></section>
<section idd="31" id="36" parentId="35" title="第一小节" url=""></section>
<section idd="31" id="37" parentId="35" title="第二小节" url=""></section>
<section idd="31" id="38" parentId="35" title="第三小节" url=""></section>
<section idd="31" id="39" parentId="31" title="单元三" url=""></section>
<section idd="31" id="40" parentId="39" title="第一小节" url=""></section>
<section idd="31" id="41" parentId="39" title="第二小节" url=""></section>
<section idd="31" id="42" parentId="39" title="第三小节" url=""></section>
<section idd="31" id="43" parentId="39" title="第四小节" url=""></section>
<section idd="31" id="44" parentId="39" title="第五小节" url=""></section>
<section idd="31" id="45" parentId="31" title="单元四" url=""></section>
<section idd="31" id="46" parentId="45" title="第一小节" url=""></section>
<section idd="31" id="47" parentId="45" title="第二小节" url=""></section>
<section idd="31" id="48" parentId="45" title="第三小节" url=""></section>
<section idd="31" id="49" parentId="31" title="单元五" url=""></section>
<section idd="31" id="50" parentId="49" title="第一小节" url=""></section>
<section idd="51" id="51" parentId="0" title="模块三：文字编辑软件 Word 2003" url="3.htm?id=51"></section>
<section idd="51" id="52" parentId="51" title="单元一" url=""></section>
<section idd="51" id="53" parentId="52" title="第一小节" url=""></section>
<section idd="51" id="54" parentId="51" title="单元二" url=""></section>
<section idd="51" id="55" parentId="54" title="第一小节" url=""></section>
<section idd="51" id="56" parentId="54" title="第二小节" url=""></section>
<section idd="51" id="57" parentId="54" title="第三小节" url=""></section>
<section idd="51" id="58" parentId="51" title="单元三" url=""></section>
<section idd="51" id="59" parentId="58" title="第一小节" url=""></section>
<section idd="60" id="60" parentId="0" title="模块四：电子表格软件Excel 2003" url="4.htm?id=60"></section>
<section idd="60" id="61" parentId="60" title="单元一" url=""></section>
<section idd="60" id="62" parentId="61" title="第一小节" url=""></section>
<section idd="63" id="63" parentId="0" title="模块五：演示文稿软件PowerPoint 2003" url="5.htm?id=63"></section>
<section idd="63" id="64" parentId="63" title="单元一" url=""></section>
<section idd="63" id="65" parentId="64" title="第一小节" url=""></section>
<section idd="63" id="66" parentId="63" title="单元二" url=""></section>
<section idd="63" id="67" parentId="66" title="第一小节" url=""></section>
<section idd="63" id="68" parentId="63" title="单元三" url=""></section>
<section idd="63" id="69" parentId="68" title="第一小节" url=""></section>
<section idd="63" id="70" parentId="63" title="单元四" url=""></section>
<section idd="63" id="71" parentId="70" title="第一小节" url=""></section>
<section idd="63" id="72" parentId="70" title="第二小节" url=""></section>
<section idd="73" id="73" parentId="0" title="模块六：计算机网络及应用" url="6.htm?id=73"></section>
<section idd="73" id="74" parentId="73" title="单元一" url=""></section>
<section idd="73" id="75" parentId="74" title="第一小节" url=""></section>
<section idd="73" id="76" parentId="73" title="单元二" url=""></section>
<section idd="73" id="77" parentId="76" title="第一小节" url=""></section>
<section idd="73" id="78" parentId="76" title="第二小节" url=""></section>
<section idd="79" id="79" parentId="0" title="模块七：计算机安全" url="7.htm?id=79"></section>
<section idd="79" id="80" parentId="79" title="单元一" url=""></section>
<section idd="79" id="81" parentId="80" title="第一小节" url=""></section>
<section idd="82" id="82" parentId="0" title="模块八：多媒体技术" url="8.htm?id=82"></section>
<section idd="82" id="83" parentId="82" title="单元一" url=""></section>
<section idd="82" id="84" parentId="83" title="第一小节" url=""></section>
</SectionInfo>
<SectionInfo>
<section id="0" parentId="-1" title="计算机应用" url=""></section>
<section idd="1" id="1" parentId="0" title="模块一：计算机基础知识" url="1.htm?id=1"></section>
<section idd="1" id="2" parentId="1" title="单元一" url=""></section>
<section idd="1" id="3" parentId="2" title="第一小节" url="1.1.1.htm?id=3"></section>
<section idd="1" id="4" parentId="2" title="第二小节" url="1.1.2.htm?id=4"></section>
<section idd="1" id="5" parentId="2" title="第三小节" url="1.1.3.htm?id=5"></section>
<section idd="1" id="6" parentId="2" title="第四小节" url="1.1.4.htm?id=6"></section>
<section idd="1" id="7" parentId="1" title="单元二" url=""></section>
<section idd="1" id="8" parentId="7" title="第一小节" url="1.2.1.htm?id=8"></section>
<section idd="1" id="9" parentId="7" title="第二小节" url="1.2.2.htm?id=9"></section>
<section idd="1" id="10" parentId="1" title="单元三" url=""></section>
<section idd="1" id="11" parentId="10" title="第一小节" url="1.3.1.htm?id=11"></section>
<section idd="1" id="12" parentId="10" title="第二小节" url="1.3.2.htm?id=12"></section>
<section idd="1" id="13" parentId="10" title="第三小节" url="1.3.3.htm?id=13"></section>
<section idd="1" id="14" parentId="10" title="第四小节" url="1.3.4.htm?id=14"></section>
<section idd="1" id="15" parentId="10" title="第五小节" url="1.3.5.htm?id=15"></section>
<section idd="1" id="16" parentId="1" title="单元四" url=""></section>
<section idd="1" id="17" parentId="16" title="第一小节" url="1.4.1.htm?id=17"></section>
<section idd="1" id="18" parentId="16" title="第二小节" url="1.4.2.htm?id=18"></section>
<section idd="1" id="19" parentId="16" title="第三小节" url="1.4.3.htm?id=19"></section>
<section idd="1" id="20" parentId="16" title="第四小节" url="1.4.4.htm?id=20"></section>
<section idd="1" id="21" parentId="16" title="第五小节" url="1.4.5.htm?id=21"></section>
<section idd="1" id="22" parentId="16" title="第六小节" url="1.4.6.htm?id=22"></section>
<section idd="1" id="23" parentId="1" title="单元五" url=""></section>
<section idd="1" id="24" parentId="23" title="第一小节" url="1.5.1.htm?id=24"></section>
<section idd="1" id="25" parentId="1" title="单元六" url=""></section>
<section idd="1" id="26" parentId="25" title="第一小节" url="1.6.1.htm?id=26"></section>
<section idd="1" id="27" parentId="1" title="单元七" url=""></section>
<section idd="1" id="28" parentId="27" title="第一小节" url="1.7.1.htm?id=28"></section>
<section idd="1" id="29" parentId="27" title="第二小节" url="1.7.2.htm?id=29"></section>
<section idd="1" id="30" parentId="27" title="第三小节" url="1.7.3.htm?id=30"></section>
<section idd="31" id="31" parentId="0" title="模块二：Windows XP 操作系统" url="2.htm?id=31"></section>
<section idd="31" id="32" parentId="31" title="单元一" url=""></section>
<section idd="31" id="33" parentId="32" title="第一小节" url=""></section>
<section idd="31" id="34" parentId="32" title="第二小节" url=""></section>
<section idd="31" id="35" parentId="31" title="单元二" url=""></section>
<section idd="31" id="36" parentId="35" title="第一小节" url=""></section>
<section idd="31" id="37" parentId="35" title="第二小节" url=""></section>
<section idd="31" id="38" parentId="35" title="第三小节" url=""></section>
<section idd="31" id="39" parentId="31" title="单元三" url=""></section>
<section idd="31" id="40" parentId="39" title="第一小节" url=""></section>
<section idd="31" id="41" parentId="39" title="第二小节" url=""></section>
<section idd="31" id="42" parentId="39" title="第三小节" url=""></section>
<section idd="31" id="43" parentId="39" title="第四小节" url=""></section>
<section idd="31" id="44" parentId="39" title="第五小节" url=""></section>
<section idd="31" id="45" parentId="31" title="单元四" url=""></section>
<section idd="31" id="46" parentId="45" title="第一小节" url=""></section>
<section idd="31" id="47" parentId="45" title="第二小节" url=""></section>
<section idd="31" id="48" parentId="45" title="第三小节" url=""></section>
<section idd="31" id="49" parentId="31" title="单元五" url=""></section>
<section idd="31" id="50" parentId="49" title="第一小节" url=""></section>
<section idd="51" id="51" parentId="0" title="模块三：文字编辑软件 Word 2003" url="3.htm?id=51"></section>
<section idd="51" id="52" parentId="51" title="单元一" url=""></section>
<section idd="51" id="53" parentId="52" title="第一小节" url=""></section>
<section idd="51" id="54" parentId="51" title="单元二" url=""></section>
<section idd="51" id="55" parentId="54" title="第一小节" url=""></section>
<section idd="51" id="56" parentId="54" title="第二小节" url=""></section>
<section idd="51" id="57" parentId="54" title="第三小节" url=""></section>
<section idd="51" id="58" parentId="51" title="单元三" url=""></section>
<section idd="51" id="59" parentId="58" title="第一小节" url=""></section>
<section idd="60" id="60" parentId="0" title="模块四：电子表格软件Excel 2003" url="4.htm?id=60"></section>
<section idd="60" id="61" parentId="60" title="单元一" url=""></section>
<section idd="60" id="62" parentId="61" title="第一小节" url=""></section>
<section idd="63" id="63" parentId="0" title="模块五：演示文稿软件PowerPoint 2003" url="5.htm?id=63"></section>
<section idd="63" id="64" parentId="63" title="单元一" url=""></section>
<section idd="63" id="65" parentId="64" title="第一小节" url=""></section>
<section idd="63" id="66" parentId="63" title="单元二" url=""></section>
<section idd="63" id="67" parentId="66" title="第一小节" url=""></section>
<section idd="63" id="68" parentId="63" title="单元三" url=""></section>
<section idd="63" id="69" parentId="68" title="第一小节" url=""></section>
<section idd="63" id="70" parentId="63" title="单元四" url=""></section>
<section idd="63" id="71" parentId="70" title="第一小节" url=""></section>
<section idd="63" id="72" parentId="70" title="第二小节" url=""></section>
<section idd="73" id="73" parentId="0" title="模块六：计算机网络及应用" url="6.htm?id=73"></section>
<section idd="73" id="74" parentId="73" title="单元一" url=""></section>
<section idd="73" id="75" parentId="74" title="第一小节" url=""></section>
<section idd="73" id="76" parentId="73" title="单元二" url=""></section>
<section idd="73" id="77" parentId="76" title="第一小节" url=""></section>
<section idd="73" id="78" parentId="76" title="第二小节" url=""></section>
<section idd="79" id="79" parentId="0" title="模块七：计算机安全" url="7.htm?id=79"></section>
<section idd="79" id="80" parentId="79" title="单元一" url=""></section>
<section idd="79" id="81" parentId="80" title="第一小节" url=""></section>
<section idd="82" id="82" parentId="0" title="模块八：多媒体技术" url="8.htm?id=82"></section>
<section idd="82" id="83" parentId="82" title="单元一" url=""></section>
<section idd="82" id="84" parentId="83" title="第一小节" url=""></section>
</SectionInfo>
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