def registry_tags(self, query_string='{http://gis.harvard.edu/HHypermap/registry/0.1}property'):
        """
        Get extra metadata tagged with a registry keyword.
        For example:
            <registry:property name="nomination/serviceOwner" value="True"/>
            <registry:property name="nominator/name" value="Random Person"/>
            <registry:property name="nominator/email" value="contact@example.com"/>
            <registry:property name="lastmodifiedby" value="2016-10-23"/>
            <registry:property name="updateFreq" value="as needed"/>
            <registry:property name="mission" value="RIO"/>
            <registry:property name="authentication" value="Open"/>
            <registry:property name="crisis" value="False"/>
            <registry:property name="intlAgreement/multi" value="none"/>
            <registry:property name="intlAgreement/bilateral" value="none"/>
            <registry:property name="classificationRecord/classification" value="Unclassified"/>
            <registry:property name="classificationData/classification" value="Unclassified"/>
            <registry:property name="serviceName/classification/classification" value="Unclassified"/>
            <registry:property name="serviceName/classification/classifiedBy" value="TNT"/>
            <registry:property name="description/classification/classification" value="Unclassified"/>
            <registry:property name="description/classification/classifiedBy" value="TNT"/>
            <registry:property name="ContactInformation/Primary/owner" value="Help Desk"/>
            <registry:property name="ContactInformation/Primary/organization" value="Three Letter One"/>
            <registry:property name="ContactInformation/Email" value="contact@example.com"/>
            <registry:property name="ContactInformation/Phone" value="Toll-free: 1 800 555-5555"/>
            <registry:property name="license/restrictions" value="none"/>
            <registry:property name="license/copyright" value="Private. For testing purposes."/>

        """
        from pycsw.core.etree import etree

        parsed = etree.fromstring(self.xml, etree.XMLParser(resolve_entities=False))
        registry_tags = parsed.findall(query_string)

        registry_dict = {}
        for tag in registry_tags:
            try:
                registry_dict[tag.attrib['name']] = tag.attrib['value']
            except Exception, e:
                LOGGER.error(e, exc_info=True)

        return registry_dict
Get extra metadata tagged with a registry keyword.
        For example:
            <registry:property name="nomination/serviceOwner" value="True"/>
            <registry:property name="nominator/name" value="Random Person"/>
            <registry:property name="nominator/email" value="contact@example.com"/>
            <registry:property name="lastmodifiedby" value="2016-10-23"/>
            <registry:property name="updateFreq" value="as needed"/>
            <registry:property name="mission" value="RIO"/>
            <registry:property name="authentication" value="Open"/>
            <registry:property name="crisis" value="False"/>
            <registry:property name="intlAgreement/multi" value="none"/>
            <registry:property name="intlAgreement/bilateral" value="none"/>
            <registry:property name="classificationRecord/classification" value="Unclassified"/>
            <registry:property name="classificationData/classification" value="Unclassified"/>
            <registry:property name="serviceName/classification/classification" value="Unclassified"/>
            <registry:property name="serviceName/classification/classifiedBy" value="TNT"/>
            <registry:property name="description/classification/classification" value="Unclassified"/>
            <registry:property name="description/classification/classifiedBy" value="TNT"/>
            <registry:property name="ContactInformation/Primary/owner" value="Help Desk"/>
            <registry:property name="ContactInformation/Primary/organization" value="Three Letter One"/>
            <registry:property name="ContactInformation/Email" value="contact@example.com"/>
            <registry:property name="ContactInformation/Phone" value="Toll-free: 1 800 555-5555"/>
            <registry:property name="license/restrictions" value="none"/>
            <registry:property name="license/copyright" value="Private. For testing purposes."/>