comment: |
  My children define the 'special-purpose' properties used by the
  bazki system.  Their individual names are built in to the system, so
  don't change them arbitrarily.  You can use this to change the
  'product' property (which contains the representation you get when
  you 'get' an element) to be named 'display', for example.  This
  doesn't update the names of existing properties, so changing these
  probably breaks everything until properties are renamed.
propname: