bfe_isbn.py
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	# -- coding: utf-8 --
	##
	## This file is part of CDS Invenio.
	## Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008 CERN.
	##
	## CDS Invenio is free software; you can redistribute it and/or
	## modify it under the terms of the GNU General Public License as
	## published by the Free Software Foundation; either version 2 of the
	## License, or (at your option) any later version.
	##
	## CDS Invenio is distributed in the hope that it will be useful, but
	## WITHOUT ANY WARRANTY; without even the implied warranty of
	## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	## General Public License for more details.
	##
	## You should have received a copy of the GNU General Public License
	## along with CDS Invenio; if not, write to the Free Software Foundation, Inc.,
	## 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
	"""BibFormat element - Print ISBN
	"""

	__revision__ = "$Id$"

	def format(bfo, separator=", "):
	"""
	Returns the ISBN of the record.
	"""
	isbn_numbers = bfo.fields("020__a")

	return separator.join(isbn_numbers)

	def escape_values(bfo):
	"""
	Called by BibFormat in order to check if output of this element
	should be escaped.
	"""
	return 0