class Magick::Image

def each_iptc_dataset

Iterate over IPTC record number:dataset tags, yield for each non-nil dataset

def each_iptc_dataset
  Magick::IPTC.constants.each do |record|
    rec = Magick::IPTC.const_get(record)
    rec.constants.each do |dataset|
      data_field = get_iptc_dataset(rec.const_get(dataset))
      yield(dataset, data_field) unless data_field.nil?
    end
  end
  nil
end