While useful sounding, ovsdb-tool does not actually implement a command
called "extract-schema".
" create DB SCHEMA create DB with the given SCHEMA\n"
" compact DB [DST] compact DB in-place (or to DST)\n"
" convert DB SCHEMA [DST] convert DB to SCHEMA (to DST)\n"
- " extract-schema DB print DB's schema on stdout\n"
" query DB TRNS execute read-only transaction on DB\n"
" transact DB TRNS execute read/write transaction on DB\n"
" show-log DB prints information about DB's log entries\n",