om the two individual specifications and added to this
  document. Two definitions of a type are identical if the HTML that defines the
  types is identical and if all of the types referenced by those two types are
  identical.
</p>
<p>
  When it becomes necessary to change the definition of a common type in one
  protocol such that the type will no longer be common, that type and any types
  that reference that type must be removed from this document and added to both
  of the documents that include this d