转自：http://bioinfo.ustc.edu.cn/seagven/?p=769
DOMDocument::load() [domdocument.load]: Extra content at the end of the document in file *****
使用的xml文档如下
<?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>