2.1.275 Section 9.1.3, Layer
a. The standard defines the element <draw:layer>
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This element is supported in core PowerPoint 2007.
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This element is used to identify backgrounds inherited by layouts from masters. If a shape on a master-page is identified as a layout and the shape is on a layer that has a name in the form "<master-page-bg>", then these shapes are inherited from the slide master, and will not appear on the slide. Layers are also used to signify hidden/protected shapes. Beyond these uses, PowerPoint 2007 does not support a general concept of layers.
b. The standard defines the attribute draw:display, contained within the element <draw:layer>
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This attribute is supported in core PowerPoint 2007.
c. The standard defines the attribute draw:name, contained within the element <draw:layer>
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This attribute is supported in core PowerPoint 2007.
d. The standard defines the attribute draw:protected, contained within the element <draw:layer>
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This attribute is supported in core PowerPoint 2007.
e. The standard defines the attribute svg:desc, contained within the element <draw:layer>
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This attribute is not supported in core PowerPoint 2007.
f. The standard defines the attribute svg:title, contained within the element <draw:layer>
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This attribute is not supported in core PowerPoint 2007.