http://www.pwg.org/pipermail/ipp/2017/019246.html

Printer Description attributes:				Reference
------------------------------				---------
platform-shape (type2 keyword)				[APPLE20170629]


Attributes (attribute syntax)
  Keyword Attribute Value				Reference
  -----------------------				---------
platform-shape (type2 keyword)				[APPLE20170629]
  ellipse						[APPLE20170629]
  rectangle						[APPLE20170629]

Add Apple "platform-shape" attribute registration.
Add Apple "platform-shape" attribute registration.
