working through title logic for ld4all with isbd nonsense

titlesLD4All.txt

245value = full value of 245 field (all subfields included)
:work1 = bf:Work instance related to MARC record being processed
EOL = end of the field OR until the presence of $c

if 245value exists:
  for first subfield present (either $a or $k):
    create :title1 instance
    :work1 ld4l:hasPreferredTitle :title1 .
    :title1 a madsrdf:Title ;
      rdfs:label "values of subfields if exist, concatenated in order found, stopping at ';', '=', or EOL: a,b,f,g,k,n,p,v (string punctuation preceding $c)" ;
      dcterms:hasPart :title1part1 .
    :title1part1 a madsrdf:MainTitleElement ;
      rdfs:label "value of first subfield normalized (strip trailing punctuation)"
  for each following subfield before ';', '=' or EOL:
    if is $b and is subfield is preceded by ':' :
      subtitleString = $b from start of subfield until next ';', ':', '=', end of subfield or EOL.
      :title1 dcterms:hasPart :title1part2 .
      :title1part2 a madsrdf:SubTitleElement ;
        rdfs:label subtitleString ;
        ld4l:rank = '1' .
      if $b contains '