初学者，大家帮忙解释一下这个是什么意思？
QDomDocument domTree;
QDomNodeList IEDlist = domTree.elementsByTagName(tag);
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QDomNodeList QDomDocument::elementsByTagName ( const QString & tagname ) const
Returns a QDomNodeList, that contains all the elements in the document with the name tagname. The order of the node list is the order they are encountered in a preorder traversal of the element tree.
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Qt Assistant