21. The non-transitory computer-readable storage medium of claim 19 , wherein the attribute of each note specifies the location in the document with which the note is associated.
21. The non-transitory computer-readable storage medium of claim 19 , wherein the attribute of each note specifies the location in the document with which the note is associated. 22. The non-transitory computer-readable storage medium of claim 21 , further comprising instructions for: determining a page order of the locations in the document associated with the notes in the aggregated set; determining an order of the notes in the aggregated set based on the locations in the document with which the notes are associated and the determined page order of the locations within the document; and displaying the notes in the aggregated set in the determined order.