System.Xml.Schema.RangeContentValidator.ExpectedElements C# (CSharp) Method

        public override ArrayList ExpectedElements(ValidationState context, bool isRequiredOnly) {
            ArrayList names = null;
            BitSet expectedPos;
            if (context.RunningPositions != null) {
                List<RangePositionInfo> runningPositions = context.RunningPositions;
                expectedPos = new BitSet(positions.Count);
                for (int i = context.CurrentState.NumberOfRunningPos - 1; i >=0; i--) {
                    Debug.Assert(runningPositions[i].curpos != null);
                    expectedPos.Or(runningPositions[i].curpos);
                }
                for (int pos = expectedPos.NextSet(-1); pos != -1; pos = expectedPos.NextSet(pos)) {
                    if (names == null) {
                        names = new ArrayList();
                    }
                    int symbol = positions[pos].symbol;
                    if (symbol >= 0) { //non range nodes
                        XmlSchemaParticle p = positions[pos].particle as XmlSchemaParticle;
                        if (p == null) {
                            string s = symbols.NameOf(positions[pos].symbol);
                            if (s.Length != 0) {
                                names.Add(s);
                            }
                        }
                        else {
                            string s = p.NameString;
                            if (!names.Contains(s)) {
                                names.Add(s);
                            }
                        }
                    }
                }
            }
            return names;
        }