KB - ANP Radio Bulletins importers

[piconti]

Create the importer for KB ANP data based on samples extracted from the API.

Documentation relating to KB's API is here:

• listing sets: http://services.kb.nl/mdo/oai?verb=ListSets
• listing the contents of ANP set: http://services.kb.nl/mdo/oai?verb=ListIdentifiers&set=anp&metadataPrefix=didl
• listing the contents of one ANP record: http://services.kb.nl/mdo/oai?verb=GetRecord&identifier=anp:anp:1937:10:01:1:mpeg21&metadataPrefix=didl
• Obtaining the image for this one ANP record: http://resolver.kb.nl/resolve?urn=anp:1937:10:01:1:mpeg21:image
• Obtaining the OCR for this one ANP record (ALTO): http://resolver.kb.nl/resolve?urn=anp:1937:10:01:1:mpeg21:alto
• Obtainign the plain text ocr: https://resolver.kb.nl/resolve?urn=anp:1937:10:01:1:mpeg21:ocr

It would be helpful to know how many elements are in the ANP collection to know if it's possible to directly fetch it all from the API or if we should wait for a dump.

Action points for this issue are:

• Identify the total number of radio bulletins in the ANP collection which are available on the app
• Extract some samples, from different eras to have a relatively wide range of examples
• Look at the samples' format and structure. Identify if the Radio Bulletin CI schema would work for it
• Implement an importer that creates radio-bulletin content-items
• create an issue to document and comment the code relating to this.