Remove xsi:nil attibute using IXMLDOMDOCUMENT in Delphi

Question

I have an xml document that contains many xml nodes. The document has xsi:nil="true" attributes. If I set values on these nodes, the nil attribute remains and it becomes invalid against my xsd.

Question:

How do I remove the xsi:nil attributes using Delphi 2006 code with the MSXML2_TLB?

I tried this:

xmlNode.attributes.removeNamedItem('xsi:nil');

It runs without an error, but does not remove the attribute.

Answer 1

Call IXmlDomElement.removeAttribute on the node itself, not the attribute collection. Any IXmlDomNode object that represents an element should implement IXmlDomElement as well, so type-cast the node:

OleCheck((xmlNode as IXmlDomElement).removeAttribute('xsi:nil'));

If you're using the XmlIntf unit instead of the Microsoft DOM, then call IXmlNode.SetAttributeNS. Pass Null as the value and the attribute will be removed:

xmlNode.SetAttributeNS('nil', 'xsi', Null);