#
# Ngram Index Descriptor
#
$control: 1
descriptor:
{
  data-table:	_df
    /num-records=1
    /max-records=1
  {
    # Header information for partition management
    worm:	_DBVERSION 	text
    fixwidth:	_NGMSTAMP	4  date
    fixwidth:	_WLDSTAMP	4  date
    fixwidth:   _WLDREV		4  signed-integer 
    
    fixwidth:	_SPARE1	    	16 text
    fixwidth:	_SPARE2	     	4 signed-integer
  }


  # accelerated index and text 
  data-table:	ng1
  {
    fixwidth:  NGRAMLEV1	3 text  
  }
  data-table:  ng2
  {
    fixwidth: NGRAMLEV2		3 text
  }
  data-table:  ng3
  {
    fixwidth: NGRAMTEXT		3 text
  }

  # instance vectors
  data-table:	ngv
  {
    varwidth:	NGRAMRECS    ngr
    fixwidth:   NGRAMRECS_OF 	4 unsigned-integer
    fixwidth:   NGRAMRECS_SZ 	3 unsigned-integer
    
    varwidth:   NGRAMINFO    ngi
    fixwidth:   NGRAMINFO_OF 	4 unsigned-integer
    fixwidth:   NGRAMINFO_SZ 	3 unsigned-integer
  }
}
$$