| 摘要 |
<p>An improved intermediate spreadsheet structure for representing n-dimensional spreadsheets as a set of nested segments. Each non-empty cell of the spreadsheet is represented by a cell segment (1617). Cells belonging to a first-dimensional element of the spreadsheet such as a row are contained in a row segment (1619). Vector segments representing elements of a second-dimensional element such as a matrix are contained in a matrix segment (1627). Each segment further contains descriptors (1607) defining aspects of the segment's content. The cell segments may further contain an expression control and descriptors belonging to one expression control. The descriptors belonging to the expression control define operands and an operator. Other aspects specified by descriptors include the manner in which the spreadsheet and its contents are to be formatted for display, access control for portions of the spreadsheet, data types of values, and rules for the order in which the values of the cells in the spreadsheet are computed.</p> |
