"""
Copyright(C) 2007 INL
Written by Damien Boucard <damien.boucard AT inl.fr>

This program 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, version 3 of the License.

This program 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 this program; if not, see <http://www.gnu.org/licenses/>.
"""

etree = None
try:
    from lxml import etree
except ImportError:
    pass

if not etree:
    try:
        # Python 2.5 ElementTree
        from xml.etree import ElementTree as etree
    except ImportError, err:
        pass

if not etree:
    try:
        # Python 2.4 cElementTree
        import cElementTree as etree
    except ImportError:
        pass

if not etree:
    try:
        # Python 2.4 ElementTree
        from elementtree import ElementTree as etree
    except ImportError:
        pass

if not etree:
    raise ImportError("Cannot import an elementtree-compliant xml "+
                      "library. Please install one of those "+
                      "libraries (by order of recommendation) : "+
                      "(1) lxml, (2) cElementTree or (3) ElementTree")