Create XML Nodes based on XPath?

Question

Does anyone know of an existing means of creating an XML hierarchy programatically from an XPath expression?

For example if I have an XML fragment such as:

Answer 1

• For XDocument
• Supports attribute creation

Use

var xDoc = new XDocument(new XElement("root",
                        new XElement("child1"),
                        new XElement("child2")));

CreateElement(xDoc, "/root/child3");
CreateElement(xDoc, "/root/child4[@year=32][@month=44]");
CreateElement(xDoc, "/root/child4[@year=32][@month=44]/subchild1");
CreateElement(xDoc, "/root/child4[@year=32][@month=44]/subchild1/subchild[@name='jon']");
CreateElement(xDoc, "/root/child1");

define

public static XDocument CreateElement(XDocument document, string xpath)
{
    if (string.IsNullOrEmpty(xpath))
        throw new InvalidOperationException("Xpath must not be empty");

    var xNodes = Regex.Matches(xpath, @"\/[^\/]+").Cast().Select(it => it.Value).ToList();
    if (!xNodes.Any())
        throw new InvalidOperationException("Invalid xPath");

    var parent = document.Root;
    var currentNodeXPath = "";
    foreach (var xNode in xNodes)
    {
        currentNodeXPath += xNode;
        var nodeName = Regex.Match(xNode, @"(?<=\/)[^\[]+").Value;
        var existingNode = parent.XPathSelectElement(currentNodeXPath);
        if (existingNode != null)
        {
            parent = existingNode;
            continue;
        }

        var attributeNames =
          Regex.Matches(xNode, @"(?<=@)([^=]+)\=([^]]+)")
                .Cast()
                .Select(it =>
                {
                    var groups = it.Groups.Cast().ToList();
                    return new { AttributeName = groups[1].Value, AttributeValue = groups[2].Value };
                });

        parent.Add(new XElement(nodeName, attributeNames.Select(it => new XAttribute(it.AttributeName, it.AttributeValue)).ToArray()));
        parent = parent.Descendants().Last();
    }
    return document;
}