This container represents the master slide in a presentation. As such, most of its contents are the ones that a Slide container would have, such as :
A Slide Atom
A SlideBase Atom
Headers and Footers container if any
Slide Scheme objects that represent the predfined schemes for the presentation if any. (Instance: 6 )
Master text styles
A SSSlideInfoAtom which keeps the SlideShow transitions and builds if any
A HeadersFootersObject if any
A PPDrawing container
A slide color scheme container (Type: Scheme and Instance: 1)
A CString representing the slide name if any ( Instance: 3 )
A TagInfo container if any
A CString representing the template name if any ( Instance : 2 )