Add fixes to retrieve static repository information

[nichtich]

The importer makes sense for ListRecords and ListIdentifiers - the other OAI verbs could be supported in form of fixes, e.g. ListSets:

  oai_sets('http://oai.example.org/');        # result as object in field 'oai_sets'
  oai_sets('http://oai.example.org/','sets'); # result as object in field 'sets'
  oai_sets(url);                              # from server given in field 'url'

  echo '{"url":"http://export.arxiv.org/oai2"}' | catmandu convert --fix 'oai_sets(url)'

The fixes could be:

• oai_sets - ListSets
• oai_identify - Identify
• oai_formats - ListMetadataFormats

Given a list of OAI Base URL as input one could get more information about the repositories with this fixes.

[nicolasfranck]

I've made a few branches for these:

• list_sets:

  • Catmandu::Importer::OAI with option "listSets"

• list_metadata_formats (sub branch of list_sets):

  • Catmandu::Importer::OAI with option "listMetadataFormats"

• fixes:

  • Catmandu::Fix::oai_identify