Replace EBNF syntax with: Reference ::= ' [' Source? RangeAddress '] ' RangeAddress ::= SheetLocatorOrEmpty '.' Column Row (':' '.' Column Row )? | SheetLocatorOrEmpty '.' Column ':' '.' Column | SheetLocatorOrEmpty '.' Row ':' '.' Row SheetLocator '.' Column Row ':' SheetLocator '.' Column Row | SheetLocator '.' Column ':' SheetLocator '.' Column | SheetLocator '.' Row ':' SheetLocator '.' Row SheetLocatorOrEmpty ::= SheetLocator | /* empty */ SheetLocator ::= SheetName ('.' SubtableCell)* SheetName ::= QuotedSheetName | '$'? [^\]\. #$'] + QuotedSheetName ::= '$'? SingleQuoted | Error SubtableCell ::= ( Column Row ) | QuotedSheetName Column ::= '$'? [A-Z] + Row ::= '$'? [1-9] [0-9] * Source ::= "'" IRI "'" "#" CellAddress ::= SheetLocatorOrEmpty '.' Column Row /* Not used directly */ In definition text add: If a RangeAddress does not contain a Column element or does not contain a Row element, it specifies a cell rectangle (3.8 Reference). If it contains Row elements, the cell rectangle starts on the first column and ends on the last column the evaluator supports. If it contains Column elements, the cell rectangle starts on the first row and ends on the last row the evaluator supports. If in a RangeAddress the first part (left of ':' colon) contains a SheetLocator and the second part (right of ':' colon) does not contain a SheetLocator, the second part inherits the SheetLocator from the first part. If a RangeAddress contains two different SheetLocator s, it specifies a cell cuboid, see 3.8 Reference.