2.1.1170 Part 4 Section 4.5.1, cm (Comment)

a.   The standard states that the dt attribute is optional.

PowerPoint requires the dt attribute.

This note applies to the following products: 2007, 2007 SP1.

b.   The standard does not state how to interpret the position information of the pos child element.

PowerPoint interprets the position information to be relative to the top, left corner of the slide.