public static void SetRealParent(this SemanticCluster semanticCluster,
SemanticGraph semanticGraph,
XmlDocument xmlDoc)
{
var realParentNode = semanticGraph.FindCluster(semanticCluster.MediatorNodeParent)
??
semanticGraph.FindNode(semanticCluster.MediatorNodeParent);
var mediatorNodeParent = realParentNode.XmlNode ??
(realParentNode is SemanticCluster cluster
? cluster.XmlNode(semanticGraph, xmlDoc)
: realParentNode.XmlNode(xmlDoc));
mediatorNodeParent.AppendChild(semanticCluster.XmlNode ?? semanticCluster.XmlNode(semanticGraph, xmlDoc));
}