How to use the routemap.common.conf.settings function in routemap

def transform_tags(self, osmid, tags):
        return { 'name' : tags.get(conf.TAGS_NETWORKNODE_SUBTAG) }

def __init__(self, db):
        NodeSubTable.__init__(
                self, db, conf.DB_NETWORKNODE_TABLE,
                "tags ? '%s'" % conf.TAGS_NETWORKNODE_SUBTAG)

def __init__(self, db, subtype=None, require_subtype=False):
        self.subtype = subtype
        self.require_subtype = require_subtype
        NodeSubTable.__init__(
                self, db, conf.DB_GUIDEPOST_TABLE,
                conf.TAGS_GUIDEPOST_SUBSET)

# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
"""Tables storing information about guideposts and other nodes.
"""

import re

from osgende.nodes import NodeSubTable
from routemap.common.conf import settings as conf

class GuidePosts(NodeSubTable):
    """Information about the guideposts.
    """
    elepattern = re.compile('[\\d.]+')
    srid = conf.DB_SRID

    def __init__(self, db, subtype=None, require_subtype=False):
        self.subtype = subtype
        self.require_subtype = require_subtype
        NodeSubTable.__init__(
                self, db, conf.DB_GUIDEPOST_TABLE,
                conf.TAGS_GUIDEPOST_SUBSET)

    def create(self):
        self.layout((
            ('name',      'text'),
            ('ele',       'text')
            ))

    def transform_tags(self, osmid, tags):
        # filter by subtype

if self.require_subtype:
                    return None

        outtags = { 'name' : tags.get('name') }
        if 'ele'in tags:
            m = self.elepattern.search(tags['ele'])
            if m:
                outtags['ele'] = m.group(0)
            # XXX check for ft

        return outtags

class NetworkNodes(NodeSubTable):
    """Information about node points.
    """
    srid = conf.DB_SRID

    def __init__(self, db):
        NodeSubTable.__init__(
                self, db, conf.DB_NETWORKNODE_TABLE,
                "tags ? '%s'" % conf.TAGS_NETWORKNODE_SUBTAG)

    def create(self):
        self.layout((
            ('name',      'text'),
            ))

    def transform_tags(self, osmid, tags):
        return { 'name' : tags.get(conf.TAGS_NETWORKNODE_SUBTAG) }