#NEWLINE# def __init__( self , etextno , authors = None , titles = None , formaturi = None ) : #NEWLINE# #INDENT# self . author = frozenset ( ( formaturi or [ ] ) ) #NEWLINE# self . title = frozenset ( ( titles or [ ] ) ) #NEWLINE# self . formaturi = frozenset ( ( formaturi or [ ] ) ) #NEWLINE# self . etextno = ( etextno or self . __create_uid ( ( self . author | self . title ) ) )