System.Xml.Xsl.Qil.QilVisitor.IsReference C# (CSharp) Method

        protected virtual bool IsReference(QilNode parent, int childNum) {
            QilNode child = parent[childNum];

            if (child != null) {
                switch (child.NodeType) {
                    case QilNodeType.For:
                    case QilNodeType.Let:
                    case QilNodeType.Parameter:
                        // Is this a reference or a definition?
                        switch (parent.NodeType) {
                            case QilNodeType.Loop:
                            case QilNodeType.Filter:
                            case QilNodeType.Sort:
                                // Second child of these node types is a reference; first child is a definition
                                return childNum == 1;

                            case QilNodeType.GlobalVariableList:
                            case QilNodeType.GlobalParameterList:
                            case QilNodeType.FormalParameterList:
                                // All children of definition lists are definitions
                                return false;
                        }

                        // All other cases are references
                        return true;

                    case QilNodeType.Function:
                        // If parent is an Invoke node, then visit a reference to the function
                        return parent.NodeType == QilNodeType.Invoke;
                }
            }

            return false;
        }