// FILE DESCRIPTION ENTRY
        ////////////////////////////
        public override void EnterFileDescriptionEntry(CodeElementsParser.FileDescriptionEntryContext context)
        {
            var entry = new FileDescriptionEntry();

            if (context.FD() != null)
                entry.LevelIndicator = new SyntaxProperty<FileDescriptionType>(FileDescriptionType.File, ParseTreeUtils.GetFirstToken(context.FD()));
            else
            if (context.SD() != null)
                entry.LevelIndicator = new SyntaxProperty<FileDescriptionType>(FileDescriptionType.SortMergeFile, ParseTreeUtils.GetFirstToken(context.SD()));

            entry.FileName = CobolWordsBuilder.CreateFileNameReference(context.fileNameReference());

            if (context.externalClause() != null && context.externalClause().Length > 0) {
                var externalClauseContext = context.externalClause()[0];
                entry.IsExternal = new SyntaxProperty<bool>(true, ParseTreeUtils.GetFirstToken(externalClauseContext.EXTERNAL()));
            }
            if (context.globalClause() != null && context.globalClause().Length > 0) {
                var globalClauseContext = context.globalClause()[0];
                entry.IsGlobal = new SyntaxProperty<bool>(true, ParseTreeUtils.GetFirstToken(globalClauseContext.GLOBAL()));
            }
            if (context.blockContainsClause() != null && context.blockContainsClause().Length > 0) {
                var blockContainsClauseContext = context.blockContainsClause()[0];
                entry.MaxBlockSize = CobolWordsBuilder.CreateIntegerValue(blockContainsClauseContext.maxNumberOfBytes);
                if (blockContainsClauseContext.minNumberOfBytes != null) {
                    entry.MinBlockSize = CobolWordsBuilder.CreateIntegerValue(blockContainsClauseContext.minNumberOfBytes);
                }
                if (blockContainsClauseContext.CHARACTERS() != null) {
                    entry.BlockSizeUnit = new SyntaxProperty<BlockSizeUnit>(BlockSizeUnit.Characters,
                        ParseTreeUtils.GetFirstToken(blockContainsClauseContext.CHARACTERS()));
                } else
                if (blockContainsClauseContext.RECORDS() != null) {
                    entry.BlockSizeUnit = new SyntaxProperty<BlockSizeUnit>(BlockSizeUnit.Records, ParseTreeUtils.GetFirstToken(blockContainsClauseContext.RECORDS()));
                }
            }
            if (context.recordClause() != null && context.recordClause().Length > 0) {
                var recordClauseContext = context.recordClause()[0];
                if (recordClauseContext.numberOfBytes != null) {
                    entry.MinRecordSize = CobolWordsBuilder.CreateIntegerValue(recordClauseContext.numberOfBytes);
                    entry.MaxRecordSize = entry.MinRecordSize;
                } else
                if (recordClauseContext.minNumberOfBytes != null) {
                    entry.MinRecordSize = CobolWordsBuilder.CreateIntegerValue(recordClauseContext.minNumberOfBytes);
                    entry.MaxRecordSize = CobolWordsBuilder.CreateIntegerValue(recordClauseContext.maxNumberOfBytes);
                } else
                if (recordClauseContext.VARYING() != null) {
                    if (recordClauseContext.fromNumberOfBytes != null)
                        entry.MinRecordSize = CobolWordsBuilder.CreateIntegerValue(recordClauseContext.fromNumberOfBytes);
                    if (recordClauseContext.toNumberOfBytes != null)
                        entry.MaxRecordSize = CobolWordsBuilder.CreateIntegerValue(recordClauseContext.toNumberOfBytes);
                    if (recordClauseContext.dataNameReference() != null)
                        entry.RecordSizeDependingOn = CobolWordsBuilder.CreateDataNameReference(recordClauseContext.dataNameReference());
                }
            }
            if (context.labelRecordsClause() != null && context.labelRecordsClause().Length > 0) {
                var labelRecordClauseContext = context.labelRecordsClause()[0];
                if (labelRecordClauseContext.STANDARD() != null) {
                    entry.LabelRecordType = new SyntaxProperty<LabelRecordType>(LabelRecordType.StandardLabels, ParseTreeUtils.GetFirstToken(labelRecordClauseContext.STANDARD()));
                }
                if (labelRecordClauseContext.OMITTED() != null) {
                    entry.LabelRecordType = new SyntaxProperty<LabelRecordType>(LabelRecordType.Omitted, ParseTreeUtils.GetFirstToken(labelRecordClauseContext.OMITTED()));
                } else
                if (labelRecordClauseContext.dataNameReference() != null && labelRecordClauseContext.dataNameReference().Length > 0) {
                    entry.LabelRecords = new SymbolReference[labelRecordClauseContext.dataNameReference().Length];
                    for (int i = 0; i < labelRecordClauseContext.dataNameReference().Length; i++)
                        entry.LabelRecords[i] = CobolWordsBuilder.CreateDataNameReference(labelRecordClauseContext.dataNameReference()[i]);
                }
            }
            if (context.valueOfClause() != null && context.valueOfClause().Length > 0) {
                var valueOfClauseContext = context.valueOfClause()[0];
                entry.ValueOfLabelRecords = new Dictionary<SymbolReference, Variable>();
                for (int i = 0; i < valueOfClauseContext.qualifiedDataName().Length; i++) {
                    entry.ValueOfLabelRecords.Add(
                        CobolWordsBuilder.CreateQualifiedDataName(valueOfClauseContext.qualifiedDataName()[i]),
                        CobolExpressionsBuilder.CreateVariable(valueOfClauseContext.variable5()[i]));
                }
            }
            if (context.dataRecordsClause() != null && context.dataRecordsClause().Length > 0) {
                var dataRecordClauseContext = context.dataRecordsClause()[0];
                entry.DataRecords = new SymbolReference[dataRecordClauseContext.dataNameReference().Length];
                for (int i = 0; i < dataRecordClauseContext.dataNameReference().Length; i++)
                    entry.DataRecords[i] = CobolWordsBuilder.CreateDataNameReference(dataRecordClauseContext.dataNameReference()[i]);
            }
            if (context.linageClause() != null && context.linageClause().Length > 0) {
                var linageClauseContext = context.linageClause()[0];
                if (linageClauseContext.numberOfLinesInPage != null)
                    entry.LogicalPageBodyLineCount = CobolExpressionsBuilder.CreateIntegerVariable(linageClauseContext.numberOfLinesInPage);
                if (linageClauseContext.firstLineNumberOfFootingArea != null)
                    entry.LogicalPageFootingLineNumber = CobolExpressionsBuilder.CreateIntegerVariable(linageClauseContext.firstLineNumberOfFootingArea);
                if (linageClauseContext.numberOfLinesInTopMargin != null)
                    entry.LogicalPageTopMarginLineCount = CobolExpressionsBuilder.CreateIntegerVariable(linageClauseContext.numberOfLinesInTopMargin);
                if (linageClauseContext.numberOfLinesInBottomMargin != null)
                    entry.LogicalPageBottomMarginLineCount = CobolExpressionsBuilder.CreateIntegerVariable(linageClauseContext.numberOfLinesInBottomMargin);
            }
            if (context.recordingModeClause() != null && context.recordingModeClause().Length > 0) {
                var recordingModeClauseContext = context.recordingModeClause()[0];
                entry.RecordingMode = CobolWordsBuilder.CreateRecordingMode(recordingModeClauseContext.recordingMode());
            }

            Context = context;
            CodeElement = entry;
        }
 // - 2. Special registers (allocate a storage area on reference) -
 internal StorageArea CreateLinageCounterSpecialRegister(CodeElementsParser.LinageCounterSpecialRegisterContext context)
 {
     return new FilePropertySpecialRegister(
         ParseTreeUtils.GetFirstToken(context.LINAGE_COUNTER()),
         CobolWordsBuilder.CreateFileNameReference(context.fileNameReference()));
 }
 internal UseAfterIOExceptionStatement CreateUseStatementForExceptionDeclarative(CodeElementsParser.UseStatementForExceptionDeclarativeContext context)
 {
     var statement = new UseAfterIOExceptionStatement();
     if (context.GLOBAL() != null)
         statement.IsGlobal = new SyntaxProperty<bool>(true, ParseTreeUtils.GetFirstToken(context.GLOBAL()));
     if (context.fileNameReference() != null && context.fileNameReference().Length > 0) {
         statement.FileNames = new SymbolReference[context.fileNameReference().Length];
         for (int i = 0; i < context.fileNameReference().Length; i++)
             statement.FileNames[i] = CobolWordsBuilder.CreateFileNameReference(context.fileNameReference()[i]);
     }
     statement.OpenMode = CreateOpenMode(context);
     return statement;
 }
 // - 2. Special registers (allocate a storage area on reference) -
 internal StorageArea CreateLinageCounterSpecialRegister(CodeElementsParser.LinageCounterSpecialRegisterContext context)
 {
     var specialRegister = new FilePropertySpecialRegister(
         ParseTreeUtils.GetFirstToken(context.LINAGE_COUNTER()),
         CobolWordsBuilder.CreateFileNameReference(context.fileNameReference()));
     if(specialRegister.DataDescriptionEntry != null) {
         var dataDescription = specialRegister.DataDescriptionEntry;
         CobolWordsBuilder.symbolInformationForTokens[specialRegister.DataDescriptionEntry.DataName.NameLiteral.Token] = specialRegister.DataDescriptionEntry.DataName;
     }
     if (specialRegister.SymbolReference != null) {
         CobolWordsBuilder.symbolInformationForTokens[specialRegister.SymbolReference.NameLiteral.Token] = specialRegister.SymbolReference;
     }
     return specialRegister;
 }