11. A system, comprising: a processor configured to: receive entry of a formula directly into a cell of a table of a document; receive an indication to include a reference or an argument in the formula being entered into the cell, wherein receiving the indication comprises receiving a plain text entry of the reference or the argument into the formula; and in response to receiving the indication to include the reference or the argument in the formula being entered into the cell, automatically insert into the formula inside the cell a user interface object to represent the reference or the argument wherein the user interface object is an atomic user interface object that is user-selectable only as a unit, wherein the automatically inserting the user interface object into the formula inside the cell comprises automatically transforming the plain text entry into the user interface object; and a memory coupled to the processor and configured to provide the processor with instructions.
11. A system, comprising: a processor configured to: receive entry of a formula directly into a cell of a table of a document; receive an indication to include a reference or an argument in the formula being entered into the cell, wherein receiving the indication comprises receiving a plain text entry of the reference or the argument into the formula; and in response to receiving the indication to include the reference or the argument in the formula being entered into the cell, automatically insert into the formula inside the cell a user interface object to represent the reference or the argument wherein the user interface object is an atomic user interface object that is user-selectable only as a unit, wherein the automatically inserting the user interface object into the formula inside the cell comprises automatically transforming the plain text entry into the user interface object; and a memory coupled to the processor and configured to provide the processor with instructions. 12. The system recited in claim 11 , wherein the indication comprises a selection of one or more cells and wherein the automatically inserted user interface object in the formula inside the cell comprises a reference user interface object that refers to the selected cells.