…ocument Format for Office Ap- 2 The Logical Structure of a Document plications (ODF), and the ISO 29500:2008 Office Open XML (OOXML) format are the important Documents have at least two types of structure5 . XML-based document file formats. The term geometrical, or layout, struct…

…s of various aspects of the packaging format that don’t make sense for Widgets. ODF: amongst other things, it requires that a special file (‘mimetype’) be found at byte position 38, making it extremely difficult to create a package without a special tool. XPI: format (which itsel…