def item_shape!(item_shape)
      @nbuild[NS_EWS_MESSAGES].ItemShape {
        @nbuild.parent.default_namespace = @default_ns
        base_shape!(item_shape[:base_shape])
        mime_content!(item_shape[:include_mime_content]) if item_shape.has_key?(:include_mime_content)
        body_type!(item_shape[:body_type]) if item_shape[:body_type]
        if(item_shape[:additional_properties])
          additional_properties!(item_shape[:additional_properties])
        end
      }
    end
def item_shape!(item_shape)
      @nbuild[NS_EWS_MESSAGES].ItemShape {
        @nbuild.parent.default_namespace = @default_ns
        base_shape!(item_shape[:base_shape])
        mime_content!(item_shape[:include_mime_content]) if item_shape.has_key?(:include_mime_content)
        body_type!(item_shape[:body_type]) if item_shape[:body_type]
        if(item_shape[:additional_properties])
          additional_properties!(item_shape[:additional_properties])
        end
      }
    end
Build the ItemShape element
 @see http://msdn.microsoft.com/en-us/library/aa565261.aspx
 @param [Hash] item_shape The item shape structure to build from
 @todo need fully support all options