Some ugly Ruby for stuffing processed ContentDM metadata into bags.

nt2bag.rb

require 'rdf'
require 'rdf/ntriples'
require 'bagit'

graph = RDF::Graph.load('braceros.nt')

graph.each_subject do |subject|
  bag = BagIt::Bag.new(File.basename(subject))
  RDF::Writer.open("descMetadata.nt", :format => :ntriples) do |writer|
    query = RDF::Query.new do
      pattern [subject, :pred, :obj]
    end
    query.execute(graph).each do |solution|
      writer << RDF::Repository.new do |r|
        r << RDF::Statement.new({:subject => subject, :predicate => solution[:pred], :object => solution[:obj]})
      end
    end
  end
  bag.add_tag_file('descMetadata.nt', 'descMetadata.nt')
  bag.add_tag_file('hybag.yml', 'hybag.yml')
  query = RDF::Query.new do
    pattern [subject, RDF::URI('http://tom.oregonstate.edu/full'), :full]
  end
  fname = query.execute(graph).first[:full].to_s.split('\\')[-1].gsub(/^1_/, '')
  begin
    bag.add_file('content.tif', File.join('..', 'braceros-tiffs', query.execute(graph).first[:full].to_s.split('\\')[-1].gsub(/^1_/, '')))
  rescue
  end
  bag.tagmanifest!
  bag.manifest!
end