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copied!<p>In the example you present the only thing being created is the attribute ... </p> <pre><code>XmlElement element = (XmlElement)doc.SelectSingleNode("/feed/entry/content"); if (element != null) element.SetAttribute("source", ""); </code></pre> <p>If what you really want is to be able to create the hierarchy where it doesn't exist then you could your own simple xpath parser. I don't know about keeping the attribute in the xpath though. I'd rather cast the node as an element and tack on a .SetAttribute as I've done here:</p> <pre><code> static private XmlNode makeXPath(XmlDocument doc, string xpath) { return makeXPath(doc, doc as XmlNode, xpath); } static private XmlNode makeXPath(XmlDocument doc, XmlNode parent, string xpath) { // grab the next node name in the xpath; or return parent if empty string[] partsOfXPath = xpath.Trim('/').Split('/'); string nextNodeInXPath = partsOfXPath.First(); if (string.IsNullOrEmpty(nextNodeInXPath)) return parent; // get or create the node from the name XmlNode node = parent.SelectSingleNode(nextNodeInXPath); if (node == null) node = parent.AppendChild(doc.CreateElement(nextNodeInXPath)); // rejoin the remainder of the array as an xpath expression and recurse string rest = String.Join("/", partsOfXPath.Skip(1).ToArray()); return makeXPath(doc, node, rest); } static void Main(string[] args) { XmlDocument doc = new XmlDocument(); doc.LoadXml("<feed />"); makeXPath(doc, "/feed/entry/data"); XmlElement contentElement = (XmlElement)makeXPath(doc, "/feed/entry/content"); contentElement.SetAttribute("source", ""); Console.WriteLine(doc.OuterXml); } </code></pre>

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