Description's {type definitions} mapping

In Part 1, section 2.1.3 Mapping Description's XML Representation to
Component Properties reads:

  {type definitions} 	

  The set of Type Definition components corresponding to all the type
  definitions defined as descendants of the types element information
  item, if any, plus any (via xs:include) or imported (via xs:import)
  Type Definition components. At a minimum this will include all the
  global type definitions defined by XML Schema simpleType and
  complexType element information items. It MAY also include any
  definitions from some other type system which describes the
  [attributes] and [children] properties of an element information
  item. It is an error if there are multiple type definitions for each
  QName.

Why are simpleType and complexType called out here, and not element
for example?

I propose simplifying the second sentence:

  At a minimum this will include all the global definitions defined by
  XML Schema declarations.

-- 
Hugo Haas - W3C
mailto:hugo@w3.org - http://www.w3.org/People/Hugo/