RNG Schema

rng_test.py

import lxml.etree

xml = '''<job>
                <recipeSet>
                    <recipe>
                        <distroRequires>
                            <distro_name op="=" value="BlueShoeLinux5-5"/>
                        </distroRequires>
                        <hostRequires>
                            <system>
                              <last_inventoried op="=" value="2013-10-10" />
                            </system>
                            <force host="blah"/>
                        </hostRequires>
                        <task name="/distribution/install" role="STANDALONE"/>
                    </recipe>
                </recipeSet>
            </job>'''

schema = lxml.etree.RelaxNG(lxml.etree.parse('beaker-job.rng'))
print schema.validate(lxml.etree.fromstring(xml))
messages = [str(e.message) for e in schema.error_log]
print messages