2.1.326 Section 9.6.1, Common Presentation Shape Attributes

a.   The standard defines the attribute presentation:class

This attribute is supported in core PowerPoint 2007.

If an object placeholder exists on a slide, but PowerPoint 2007 finds no matching placeholder for that type of object in the layout, PowerPoint writes the placeholder out as a general object placeholder.

b.   The standard defines the attribute presentation:placeholder

This attribute is supported in core PowerPoint 2007.

PowerPoint 2007 uses this attribute to describe placeholders that are empty. It is ignored on load.

c.   The standard defines the attribute presentation:style-name

This attribute is supported in core PowerPoint 2007.

d.   The standard defines the attribute presentation:user-transform

This attribute is not supported in core PowerPoint 2007.