2.1.1141 Part 1 Section 19.5.7, attrName (Attribute Name)

a.   The standard specifies a list of allowed property values for the attrName element.

PowerPoint also allows the following values for this element:  ppt_x, ppt_y, ppt_w, ppt_h, ppt_c, ppt_r, xshear, yshear, image, ScaleX, ScaleY, r, and fillcolor.

b.   The standard does not specify whether the attrName values are case-sensitive.

PowerPoint treats these values as case-insensitive.