2.1.326 Section 9.6.1, Common Presentation Shape Attributes
a. The standard defines the attribute presentation:class
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This attribute is supported in core PowerPoint 2007.
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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
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This attribute is supported in core PowerPoint 2007.
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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
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This attribute is supported in core PowerPoint 2007.
d. The standard defines the attribute presentation:user-transform
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This attribute is not supported in core PowerPoint 2007.