Problem: XML Schema Location isn't output when creating a PREMIS event about mets-reader-writer HOT 3 CLOSED

>>> premisrw.PREMIS_META
{'xsi:schema_location': 'info:lc/xmlns/premis-v2 http://www.loc.gov/standards/premis/v2/premis-v2-2.xsd', 
 'version': '2.2'}

>>> def generate_event_with_meta():
...     # Add some new EVENTS to our METS
...     return ('event',
...             premisrw.PREMIS_META,
...             ('event_identifier',
...                 ('event_identifier_type', "UUID"),
...                 ('event_identifier_value', uuid.uuid4())),
...             ('event_type', "AM CAMP DEMO"),
...             ('event_date_time', datetime.now().isoformat()),
...             ('event_detail', "Adding new PREMIS EVENTS"),
...             ('event_outcome_information',
...                 ('event_outcome', "SUCCESS"),
...                 ('event_outcome_detail',
...                     ('event_outcome_detail_note',
...                         "dag iedereen!"))),
...             ('linking_agent_identifier',
...                 ('linking_agent_identifier_type', "python script"),
...                 ('linking_agent_identifier_value', "1.0")))
>>> print(lxml.etree.tostring(premisrw.data_to_premis(generate_event_with_meta()), pretty_print=True).decode('utf8'))
<premis:event xmlns:premis="info:lc/xmlns/premis-v2" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="info:lc/xmlns/premis-v2 http://www.loc.gov/standards/premis/v2/premis-v2-2.xsd" version="2.2">
  <premis:eventIdentifier>
    <premis:eventIdentifierType>UUID</premis:eventIdentifierType>
    <premis:eventIdentifierValue>1665f868-dff5-4e66-8a32-f38ad7582309</premis:eventIdentifierValue>
  </premis:eventIdentifier>
  <premis:eventType>AM CAMP DEMO</premis:eventType>
  <premis:eventDateTime>2018-04-09T11:53:15.846384</premis:eventDateTime>
  <premis:eventDetail>Adding new PREMIS EVENTS</premis:eventDetail>
  <premis:eventOutcomeInformation>
    <premis:eventOutcome>SUCCESS</premis:eventOutcome>
    <premis:eventOutcomeDetail>
      <premis:eventOutcomeDetailNote>dag iedereen!</premis:eventOutcomeDetailNote>
    </premis:eventOutcomeDetail>
  </premis:eventOutcomeInformation>
  <premis:linkingAgentIdentifier>
    <premis:linkingAgentIdentifierType>python script</premis:linkingAgentIdentifierType>
    <premis:linkingAgentIdentifierValue>1.0</premis:linkingAgentIdentifierValue>
  </premis:linkingAgentIdentifier>
</premis:event>