XML文件要有根标签（错误）的代码解决分享

<?xml version="1.0" encoding="UTF-8"?>      <SearchConstraints>        <Begin>glucose</Begin>        <End>Ethanol</End>        <Interface>name</Interface>        <IntermediatesInclude number="0"></IntermediatesInclude>        <IntermediatesExclude> number="0"></IntermediatesExclude>        <Organisms type="all"></Organisms>        <KShort>10</KShort>      </SearchConstraints>      <StoPList>        <StoP>          <Source id="glucose"></Source>          <Target id="Ethanol"></Target>          <RouteList>          </RouteList>        </StoP>      </StoPList>

问题所在：没有加根标签呀！XML文件只能有一个根标签！把xml改成下面这样就ok了，也就是加一个Document标签，将先前的两个根标签SearchConstraints和StoPList都放到Document标签的下面，从而整个XML文件只有一个根标签。

<?xml version="1.0" encoding="UTF-8"?>    <Document>      <SearchConstraints>        <Begin>glucose</Begin>        <End>Ethanol</End>        <Interface>name</Interface>        <IntermediatesInclude number="0"></IntermediatesInclude>        <IntermediatesExclude> number="0"></IntermediatesExclude>        <Organisms type="all"></Organisms>        <KShort>10</KShort>      </SearchConstraints>      <StoPList>        <StoP>          <Source id="glucose"></Source>          <Target id="Ethanol"></Target>          <RouteList>          </RouteList>        </StoP>      </StoPList>    </Document>

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