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copied!<h2>1. How to fix the XPath expression ?</h2> <p>Either of these will fix the query:</p> <p>1) Add the following line after creating the dom:</p> <pre><code> Doc.setProperty('SelectionLanguage', 'XPath'); </code></pre> <p>2) Better yet, you could be more explicit about which version of the parser you are creating and replace your construction line with this:</p> <pre><code>Doc := CoDOMDocument60.Create; </code></pre> <p>If the query doesn't find anything, Node will be empty.</p> <pre><code>if not Assigned(Node) then... </code></pre> <p>The default query language for the MSXML3 parser is XSLPatterns. You needed to explicitly set it to XPath. It's been a while since I've had to deal with it, but I assume the CreateOleObject line must create the MSXML parser my default.</p> <p>Update: Solution for the second half of your question stolen shamelessly (with permission) from the gracious TLama. :)</p> <h2>2. How to add a "control" node ?</h2> <p>Ignoring target document formatting and error handling e.g. this way:</p> <pre><code>procedure TForm1.Button2Click(Sender: TObject); var XMLRoot: IXMLDOMNode; XMLChild: IXMLDOMNode; XMLDocument: IXMLDOMDocument2; begin XMLDocument := CreateOleObject('Microsoft.XMLDOM') as IXMLDomDocument2; XMLDocument.load('XMLFile.xml'); XMLRoot := XMLDocument.selectSingleNode('//role/access'); if Assigned(XMLRoot) then begin XMLRoot := XMLRoot.appendChild(XMLDocument.createElement('control')); XMLChild := XMLRoot.appendChild(XMLDocument.createElement('type')); XMLChild.text := 'user'; XMLChild := XMLRoot.appendChild(XMLDocument.createElement('object')); XMLChild.text := 'COMPUTER\TLama'; XMLDocument.save('XMLFile.xml'); end; end; </code></pre>

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