XML file must have root tag (error) code solution to share

The document used is as followsxml

<?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>

The problem is: there is no root tag! XML files can only have one root tag!
It will be ok to change the xml to the following, that is, add a Document tag, and put the two previous root tags SearchConstraints and StoPList under the Document tag, so that there is only one in the entire XML file root tag.

<?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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