code: def getCorner(index,top,left,expand=0,y=206):
      ''' Return part of the XML string that defines the requested corner'''
      x = str(-(expand+old_div(ARENA_WIDTH,2))) if left else str(expand+old_div(ARENA_WIDTH,2))
      z = str(-(expand+old_div(ARENA_BREADTH,2))) if top else str(expand+old_div(ARENA_BREADTH,2))
      return 'x'+index+'="'+x+'" y'+index+'="' +str(y)+'" z'+index+'="'+z+'"f getCorner(index,top,left,expand=0,y=206):
      ''' Return part of the XML string that defines the requested corner'''
      x = str(-(expand+old_div(ARENA_WIDTH,2))) if left else str(expand+old_div(ARENA_WIDTH,2))
      z = str(-(expand+old_div(ARENA_BREADTH,2))) if top else str(expand+old_div(ARENA_BREADTH,2))
      return 'x'+index+'="'+x+'" y'+index+'="' +str(y)+'" z'+index+'="'+z+'"'
docs: Return part of the XML string that defines the requested corner