public override XmlNode SetNamedItem(XmlNode node) {
if (node != null && !(node is XmlAttribute))
throw new ArgumentException(Res.GetString(Res.Xdom_AttrCol_Object));
int offset = FindNodeOffset( node.LocalName, node.NamespaceURI );
if (offset == -1) {
return InternalAppendAttribute( (XmlAttribute) node );
}
else {
XmlNode oldNode = base.RemoveNodeAt( offset );
InsertNodeAt( offset, node );
return oldNode;
}
}