code: def create_typed_target (self, type, project, name, sources, requirements, default_build, usage_requirements):
          
          assert isinstance(type, basestring)
          assert isinstance(project, ProjectTarget)
          assert is_iterable_typed(sources, basestring)
          assert is_iterable_typed(requirements, basestring)
          assert is_iterable_typed(default_build, basestring)
          return self.main_target_alternative (TypedTarget (name, project, type,
              self.main_target_sources (sources, name),
              self.main_target_requirements (requirements, project),
              self.main_target_default_build (default_build, project),
              self.main_target_usage_requirements (usage_requirements, project)))
docs: Creates a TypedTarget with the specified properties.
              The 'name', 'sources', 'requirements', 'default_build' and
              'usage_requirements' are assumed to be in the form specified
              by the user in Jamfile corresponding to 'project'.