Contains the following elements:
- dimension - indicates the range of cells that are active in this worksheet (i.e., they have data)
- sheetViews - indicates the currently visible area of the worksheet
- sheetFormatPr - ?
- sheetData - contains descriptions of each cell in the worksheet. See the cell.md document for more info.
- pageMargins - self explanatory
- tableParts - references to the structured tables that are defined on this workshet (see table documentation)
- extLst - ?
extract/extract_worksheet_dimensions.rb will extract the dimensions of a worksheet rewrite/rewrite_whole_row_column_references_to_areas.rb will use those dimensions to convert references of the form C:E and 12:15 into those of the form C1:E80 and A12:AA15