2.1.1280 Part 1 Section 22.214.171.124, xfrm (2D Transform for Individual Objects)
a. The standard states that the rot attribute specifies the rotation of a graphic frame.
In Office, rot specifies the clockwise rotation of a shape.
b. The standard allows attributes flipH, flipV and rot to be applied to a graphicFrame.
In Office, attributes FlipH, flipV and rot are ignored when applied to a graphicFrame.