1. A data processing system, comprising: a memory storing a program; and a processor that executes the program, wherein execution of the program configures the processor to: receive a markup document, the markup document containing a number of line items, each line item representing a series of numerical values and characteristics common to the series of numerical values; display contents of at least one line item of the number of line items of the markup document, wherein the contents are simultaneously displayed in a chart view and in a tree view, and wherein the chart view displays the contents in a graph; receive a selection in the tree view of a different line item than the at least one line item, the different line item also being one of the number of line items; and automatically reconstruct the graph based on the series of numerical values and characteristics common to the series of numerical values in the different line item.
1. A data processing system, comprising: a memory storing a program; and a processor that executes the program, wherein execution of the program configures the processor to: receive a markup document, the markup document containing a number of line items, each line item representing a series of numerical values and characteristics common to the series of numerical values; display contents of at least one line item of the number of line items of the markup document, wherein the contents are simultaneously displayed in a chart view and in a tree view, and wherein the chart view displays the contents in a graph; receive a selection in the tree view of a different line item than the at least one line item, the different line item also being one of the number of line items; and automatically reconstruct the graph based on the series of numerical values and characteristics common to the series of numerical values in the different line item. 3. The data processing system of claim 1 , wherein the data processing system is further configured to store contents of the markup document in cells of a spreadsheet, wherein the spreadsheet is viewable in a spreadsheet view.