text: from musicscore.dtd.dtd import Sequence, Element
  
  from musicscore.musicxml.types.complextypes.pagelayout import ComplexTypePageLayout
  from musicscore.musicxml.types.complextypes.stafflayout import ComplexTypeStaffLayout
  from musicscore.musicxml.types.complextypes.systemlayout import ComplexTypeSystemLayout
  
  from musicscore.dtd.dtd import GroupReference, Element, Sequence
  
  from musicscore.musicxml.elements.xml_element import XMLElement
  from musicscore.musicxml.types.simple_type import TypeTenths
  
  
  #
  # class LeftMargin(XMLElement, TypeTenths):
  #     _TAG = 'left-margin'
  #
  #     def __init__(self, value=None, *args, **kwargs):
  #         super().__init__(tag=self._TAG, value=value, *args, **kwargs)
  #
  #
  # class RightMargin(XMLElement, TypeTenths):
  #     _TAG = 'right-margin'
  #
  #     def __init__(self, value=None, *args, **kwargs):
  #         super().__init__(tag=self._TAG, value=value, *args, **kwargs)
  #
  #
  # class TopMargin(XMLElement, TypeTenths):
  #     _TAG = 'top-margin'
  #
  #     def __init__(self, value=None, *args, **kwargs):
  #         super().__init__(tag=self._TAG, value=value, *args, **kwargs)
  #
  #
  # class BottomMargin(XMLElement, TypeTenths):
  #     _TAG = 'bottom-margin'
  #
  #     def __init__(self, value=None, *args, **kwargs):
  #         super().__init__(tag=self._TAG, value=value, *args, **kwargs)
  #
  #
  # """
  # The left-right-margins group specifies horizontal margins in tenths.
  # """
  #
  # LeftRightMargins = Sequence(
  #     Element(LeftMargin),
  #     Element(RightMargin)
  # )
  #
  # """
  # The all-margins group specifies both horizontal and vertical margins in tenths.
  # """
  # AllMargins = Sequence(
  #     GroupReference(LeftRightMargins),
  #     Element(TopMargin),
  #     Element(BottomMargin)
  #
  # )
  
  
  class PageLayout(ComplexTypePageLayout):
      _TAG = 'page-layout'
  
      def __init__(self, *args, **kwargs):
          super().__init__(tag=self._TAG, *args, **kwargs)
  
  
  class SystemLayout(ComplexTypeSystemLayout):
      _TAG = 'system-layout'
  
      def __init__(self, *args, **kwargs):
          super().__init__(tag=self._TAG, *args, **kwargs)
  
  
  class StaffLayout(ComplexTypeStaffLayout):
      _TAG = 'staff-layout'
  
      def __init__(self, *args, **kwargs):
          super().__init__(tag=self._TAG, *args, **kwargs)
  
  
  """
  The layout group specifies the sequence of page, system, and staff layout elements that is
                  common to both the defaults and print elements.
  """
  Layout = Sequence(
      Element(PageLayout, min_occurrence=0),
      Element(SystemLayout, min_occurrence=0),
      Element(StaffLayout, min_occurrence=0, max_occurrence=None)
  )
  