Missing title_* #14

Around 10% of the npl_publn in the beta version have neither title_j nor title_m nor title_main_a. Most of the time, part of these elements are wrongly parsed the title_main_m.

How to reproduce the behaviour

SELECT
  *
FROM (
  SELECT
    *
  FROM
    `npl-parsing.patcit.beta`
  WHERE
    title_j is NULL
    AND title_m is NULL
    AND title_main_a is NULL
    ) 
    AS parsing
JOIN (
  SELECT
    npl_publn_id AS id,
    npl_biblio
  FROM
    `usptobias.patstat.tls214`) AS tls214
ON
  tls214.id=parsing.npl_publn_id

Ideas/ solution

There seems to be a common pattern in these citations in the sense that they are already very structured (e.g NIELSEN F ET AL: 'HERSTELLUNG STAUBARMER, FREIFLIESSENDER PRODUKTE', CHEMIETECHNIK, HUTHIG, HEIDELBERG, DE, vol. 22, no. 10, 1 October 1993 (1993-10-01), pages 48 - 49, XP000415410, ISSN: 0340-9961).

At this stage, training the Grobid model on these examples seems to be the best option. Then, examples affected by this issue will be processed again.