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

        public QilNode SafeDocOrderDistinct(QilNode n)
        {
            XmlQueryType xt = n.XmlType;

            if (xt.MaybeMany)
            {
                if (xt.IsNode && xt.IsNotRtf)
                {
                    // node-set
                    return DocOrderDistinct(n);
                }
                else if (!xt.IsAtomicValue)
                {
                    QilIterator i;
                    return Loop(i = Let(n),
                        Conditional(Gt(Length(i), Int32(1)),
                            DocOrderDistinct(TypeAssert(i, T.NodeNotRtfS)),
                            i
                        )
                    );
                }
            }

            return n;
        }