This procedure is defined in the server but not documented via ad_proc or proc_doc and may be intended as a private interface.
The procedure is defined as:
proc ::xotcl::info_nonposargs {scope o method} { set result [list] foreach flag [$o ::nsf::methods::${scope}::info::method parameter $method] { if {![string match -* $flag]} continue lappend result $flag } #puts stderr "+++ get ${inst}nonposargs for $o $method => $result" return $result }