2.1.1428 Part 1 Section 21.2.2.2, applyToFront (Apply To Front)
a. The standard states that the applyToFront element specifies that the picture shall be applied to the front of the point or series.
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In Office, this element also specifies that the picture should be applied to the backWall and Office ignores this element on the floor and sideWall elements.