System.Xml.Xsl.XPath.XPathQilFactory.CheckNodeSet C# (CSharp) Method

        public void CheckNodeSet(QilNode n)
        {
            Debug.Assert(n != null && n.XmlType.IsNode, "Must be a node-set");
        }

 private QilNode CompareNodeSetAndValue(XPathOperator op, QilNode nodeset, QilNode val, XmlTypeCode compType)
 {
     _f.CheckNodeSet(nodeset);
     Debug.Assert(val.XmlType !.IsSingleton);
     Debug.Assert(compType == XmlTypeCode.Boolean || compType == XmlTypeCode.Double || compType == XmlTypeCode.String, "I don't know what to do with RTF here");
     if (compType == XmlTypeCode.Boolean || nodeset.XmlType !.IsSingleton)
     {
         return(CompareValues(op, nodeset, val, compType));
     }