The definition of a ""transparent"" format is complicated, and may be difficult to apply. For example, drawings are required to be in a format that allows them to be revised straightforwardly with ""some widely available drawing editor."" The definition of ""widely available"" may be difficult to interpret, and may change over time, since, e.g., the open-source Inkscape editor is rapidly maturing, but has not yet reached version 1.0. This section, which was rewritten somewhat between versions 1.1 and 1.2 of the license, uses the terms ""widely available"" and ""proprietary"" inconsistently and without defining them. According to a strict interpretation of the license, the references to ""generic text editors"" could be interpreted as ruling out a format used by an open-source word-processor such as Abiword; according to a loose interpretation, however, Microsoft Word .doc format could qualify as transparent, since a subset of .doc files can be edited perfectly using OpenOffice.org, and the format therefore is not one ""that can be read and edited only by proprietary word processors.