New nightly test failures in sros2

[mjcarroll]

First seen in March 8 nightly_linux_debug

sros2.test.test_policy_to_permissions.test_policy_to_permissions (from pytest)

Error Message
lxml.etree.XMLSchemaParseError: attribute use (unknown), attribute 'ref': The QName value '{http://www.w3.org/XML/1998/namespace}base' does not resolve to a(n) attribute declaration., line 34
Stacktrace
test/test_policy_to_permissions.py:33: in test_policy_to_permissions
    policy_xsd = etree.XMLSchema(etree.parse(policy_xsd_path))
src/lxml/xmlschema.pxi:86: in lxml.etree.XMLSchema.__init__
    ???
E   lxml.etree.XMLSchemaParseError: attribute use (unknown), attribute 'ref': The QName value '{http://www.w3.org/XML/1998/namespace}base' does not resolve to a(n) attribute declaration., line 34

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Just for the record: #168.

[dirk-thomas]

I am not sure what resolved the problem but the same test seems to have passed fine in the last few nights. If you can confirm please go ahead and close this ticket.

[mjcarroll]

Can confirm, may have been a transient issue. I'll close and reopen if it reoccurs.