anchor.diff:  mapping exists between children of the node and the parent address
   space.
   
  -.Example
  -See the example in Figure 2-4.
  -
  -.Figure 2-4
  +[[address-translation-example]]
  +.Address Translation Example
   ----
   FIXME
   soc
  
positive.code: information. In this case, the presence or absence of the property is
  sufficiently descriptive.
  
  Table 2-3 describes the set of basic value types defined by the {spec}.
  
  .Table 2-3 Property values
  [option="header", cols="^10,90"]
  |===
  |Value |Description
  
negative.code: 
  The _unit-address_ component of the name is specific to the bus type on
  which the node sits. It consists of one or more ASCII characters from
  the set of characters in <<node-name-characters>>. The unit-address must match the
  first address specified in the _reg_ property of the node. If the node
  has no _reg_ property, the @ and _unit-address_ must be omitted and the
  _node-name_ alone differentiates the node from other nodes at the same
  