    >>> from __future__ import (absolute_import, division, print_function)
    >>> from owslib import crs
    >>> c=crs.Crs('EPSG:4326')
    >>> c.code
    4326
    >>> c.getcodeurn()
    'urn:ogc:def:crs:EPSG::4326'
    >>> c.getcodeuri1()
    'http://www.opengis.net/def/crs/EPSG/0/4326'
    >>> c.getcodeuri2()
    'http://www.opengis.net/gml/srs/epsg.xml#4326'
    >>> c=crs.Crs('urn:ogc:def:crs:EPSG::4326')
    >>> c.authority
    'EPSG'
    >>> c.axisorder
    'yx'
    >>> c=crs.Crs('http://www.opengis.net/gml/epsg.xml#4326')
    >>> c.code
    4326
    >>> c.axisorder
    'yx'
    >>> c=crs.Crs('urn:x-ogc:def:crs:EPSG:6.11:2192')
    >>> c.axisorder
    'xy'
    >>> c.code
    2192
    >>> c.version
    '6.11'
    >>> c=crs.Crs('http://www.opengis.net/def/crs/EPSG/0/4326')
    >>> c.authority
    'EPSG'
    >>> c.code
    4326
    >>> c.axisorder
    'yx'
