anchor.diff:  === Relationship to IEEE(TM) 1275
   The {spec} is loosely related to the IEEE 1275 Open Firmware
   standard—_IEEE Standard for Boot (Initialization Configuration)
  -Firmware: Core Requirements and Practices_ <<1>>.
  +Firmware: Core Requirements and Practices_ <<b1>>.
   
   The original IEEE 1275 specification and its derivatives such as CHRP
  -<<10>> and PAPR <<16>> address problems of general purpose
  +<<b10>> and PAPR <<b16>> address problems of general purpose
   computers, such as how a single version of an operating system can work
   on several different computers within the same family and the problem of
   loading an operating system from user-installed I/O devices.
  
positive.code: probing.
  
  .Example
  <<Figure 2-1>> shows an example representation of a simple device tree that
  is nearly complete enough to boot a simple operating system, with the
  platform type, CPU, and memory described. Device nodes are shown with
  properties and values shown beside the node.
  
negative.code: compatible interrupt controllers. An open PIC interrupt controller
  implements the open PIC architecture (developed jointly by AMD and
  Cyrix) and specified in The Open Programmable Interrupt Controller (PIC)
  Register Interface Specification Revision 1.2 <<b18>>.
  
  Interrupt specifiers in an open PIC interrupt domain are encoded with
  two cells. The first cell defines the interrupt number. The second cell
  