[optim] cache rset column structures
When iterating over large resultsets (lot of colcumns, lot of lines)
to build entities, caching column structure (which attribute or relation
is stored in each column) can improve performance noticeably.
# copyright 2003-2010 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
#
# This file is part of CubicWeb.
#
# CubicWeb is free software: you can redistribute it and/or modify it under the
# terms of the GNU Lesser General Public License as published by the Free
# Software Foundation, either version 2.1 of the License, or (at your option)
# any later version.
#
# CubicWeb 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 Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License along
# with CubicWeb. If not, see <http://www.gnu.org/licenses/>.
"""map standard cubicweb schema to xml vocabularies"""
from yams import xy
xy.register_prefix('rdf', 'http://www.w3.org/1999/02/22-rdf-syntax-ns#')
xy.register_prefix('dc', 'http://purl.org/dc/elements/1.1/')
xy.register_prefix('foaf', 'http://xmlns.com/foaf/0.1/')
xy.register_prefix('doap', 'http://usefulinc.com/ns/doap#')
xy.register_prefix('sioc', 'http://rdfs.org/sioc/ns#')
xy.register_prefix('owl', 'http://www.w3.org/2002/07/owl#')
xy.register_prefix('dcterms', 'http://purl.org/dc/terms/')
xy.add_equivalence('creation_date', 'dc:date')
xy.add_equivalence('created_by', 'dc:creator')
xy.add_equivalence('description', 'dc:description')
xy.add_equivalence('CWUser', 'foaf:Person')
xy.add_equivalence('CWUser login', 'foaf:Person dc:title')
xy.add_equivalence('CWUser surname', 'foaf:Person foaf:name')