Use more specific CreativeWork types

[osma]

Currently all schema.org bibliographic entities are typed as schema:CreativeWork and instance level entities also as schema:Book. The latter is wrong in some cases. We should use the correct, more specific schema.org CreativeWork subtypes.

[osma]

For instances, this could be based on the RDA carrier categories. Here is the current breakdown:

 889902       <bf:categoryValue>nide</bf:categoryValue>
  48298       <bf:categoryValue>arkki</bf:categoryValue>
  29237       <bf:categoryValue>verkkoaineisto</bf:categoryValue>
  10226       <bf:categoryValue>äänikasetti</bf:categoryValue>
   7246       <bf:categoryValue>Digitaalinen jäljenne</bf:categoryValue>
   3725       <bf:categoryValue>äänilevy</bf:categoryValue>
   1276       <bf:categoryValue>muu</bf:categoryValue>
   1182       <bf:categoryValue>tietolevy</bf:categoryValue>
   1122       <bf:categoryValue>piirtoheitinkalvo</bf:categoryValue>
    719       <bf:categoryValue>objekti</bf:categoryValue>
    550       <bf:categoryValue>dia</bf:categoryValue>
    162       <bf:categoryValue>kortti</bf:categoryValue>
    118       <bf:categoryValue>mikrokortti</bf:categoryValue>
    116       <bf:categoryValue>mikrofilmirulla</bf:categoryValue>
     81       <bf:categoryValue>äänikela</bf:categoryValue>
     80       <bf:categoryValue>videokasetti</bf:categoryValue>
     72       <bf:categoryValue>videolevy</bf:categoryValue>
     13       <bf:categoryValue>volym</bf:categoryValue>
      6       <bf:categoryValue>mikrofilmsrulle</bf:categoryValue>
      6       <bf:categoryValue>Digitaalinen j��ljenne</bf:categoryValue>
      3       <bf:categoryValue>nc</bf:categoryValue>
      2       <bf:categoryValue>övrig</bf:categoryValue>
      2       <bf:categoryValue>Digitoitu</bf:categoryValue>
      2       <bf:categoryValue>bildkort</bf:categoryValue>
      1       <bf:categoryValue>verkkoainiesto</bf:categoryValue>
      1       <bf:categoryValue>onlineresurs</bf:categoryValue>
      1       <bf:categoryValue>nid</bf:categoryValue>
      1       <bf:categoryValue>ljudskiva</bf:categoryValue>
      1       <bf:categoryValue>ark</bf:categoryValue>
      1       <bf:categoryValue>�nilevy</bf:categoryValue>
      1       <bf:categoryValue>�nikasetti</bf:categoryValue>
      1       <bf:categoryValue>��änikasetti</bf:categoryValue>
      1       <bf:categoryValue>‡a nide</bf:categoryValue>

(we can see some errors in the long tail)

[osma]

To start, we should avoid asserting schema:Book for non-books.