bfe_oai_identifier.py
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	# -- coding: utf-8 --
	#
	# This file is part of Invenio.
	# Copyright (C) 2012 CERN.
	#
	# 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.
	#
	# 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 Invenio; if not, write to the Free Software Foundation, Inc.,
	# 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
	"""BibFormat element - Prints record OAI identifier
	"""
	import cgi
	from invenio.config import CFG_OAI_ID_FIELD

	def format_element(bfo, instance_prefix="", separator=", ", instance_suffix=""):
	"""
	Prints the record OAI identifier(s).

	@param instance_prefix: some value printed before each identifier. Must be already escaped
	@param separator: some value printed between each identifier. Must be already escaped
	@param instance_suffix: some value printed after each identifier. Must be already escaped
	"""
	return separator.join([instance_prefix + cgi.escape(value) + instance_suffix \
	for value in bfo.fields(CFG_OAI_ID_FIELD) if value])

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