Form SDR currently has no XBRL requirement.  These samples are xBRL-XML files
and are set up to parallel the structure of section 6.3, 6.5.24, and 6.24.21
which concern the handling of multiple instances with different CIKs, complicated
by the possibility of multiple distinct "exhibit L"s. It's doubtful that they
would work at this point and would need to be replaced entirely with known
working files from the other conf/605 files.  It is not a candidate for deletion,
however, because structurally the tests are sound, except for the xbrl files.