MADS RDF demo using ActiveFedora 7.0.0.rc3

Gemfile

source 'https://rubygems.org'

gem 'active-fedora', github: 'projecthydra/active_fedora', branch: 'master'
gem 'linkeddata'

mads.rb

#!/usr/bin/env ruby

# mads demo using AF 7.0 rc3

require 'active-fedora'
require 'linkeddata'

# vocabularies
class DAMS < RDF::Vocabulary("http://library.ucsd.edu/ontology/dams#")
  property :code
  property :complexSubject
  property :temporal
  property :topic
end
class MADS < RDF::Vocabulary("http://www.loc.gov/mads/rdf/v1#")
  # MADS classes
  property :ComplexSubject
  property :Temporal
  property :Topic
  property :MADSScheme

  # MADS elements
  property :isMemberOfMADSScheme
  property :hasExactExternalAuthority

  # elementList and elementList values
  property :componentList
  property :elementList
  property :elementValue
  property :TemporalElement
  property :TopicElement
end

# scheme
class MadsScheme < ActiveFedora::Rdf::Resource
  configure type: MADS.MADSScheme
  property :name, predicate: RDF::RDFS.label
  property :code, predicate: DAMS.code
  property :externalAuthority, predicate: MADS.hasExactExternalAuthority
end

# simple subjects
class MadsBase < ActiveFedora::Rdf::Resource
  property :name, predicate: MADS.authoritativeLabel
  property :externalAuthority, predicate: MADS.hasExactExternalAuthority
  property :scheme, predicate: MADS.isMemberOfMADSScheme, class_name: "MadsScheme"
  accepts_nested_attributes_for :scheme
end
class MadsSimpleType < MadsBase
  property :elementList, predicate: MADS.elementList, class_name: "MadsElementList"
  accepts_nested_attributes_for :elementList
end
class MadsElement < ActiveFedora::Rdf::Resource
  property :elementValue, predicate: MADS.elementValue
end
class MadsTemporal < MadsSimpleType
  configure type: MADS.Temporal
end
class MadsTemporalElement < MadsElement
  configure :type => MADS.TemporalElement
end
class MadsTopic < MadsSimpleType
  configure type: MADS.Topic
end
class MadsTopicElement < MadsElement
  configure :type => MADS.TopicElement
end
class MadsElementList < ActiveFedora::Rdf::List
  configure type: MADS.elementList
  property :temporalElement, predicate: MADS.TemporalElement, class_name: "MadsTemporalElement"
  property :topicElement, predicate: MADS.TopicElement, class_name: "MadsTopicElement"
  accepts_nested_attributes_for :temporalElement, :topicElement
end

# complex subject
class MadsComponentList < ActiveFedora::Rdf::List
  configure type: MADS.componentList
  property :temporal, predicate: MADS.Temporal, class_name: "MadsTemporal"
  property :topic, predicate: MADS.Topic, class_name: "MadsTopic"
  accepts_nested_attributes_for :temporal, :topic
end
class MadsComplexSubject < MadsBase
  configure type: MADS.ComplexSubject
  property :componentList, predicate: MADS.componentList, class_name: "MadsComponentList"
  accepts_nested_attributes_for :componentList
end

class DamsDatastream < ActiveFedora::RdfxmlRDFDatastream
  property :complexSubject, predicate: DAMS.complexSubject, class_name: "MadsComplexSubject"
  property :scheme, predicate: MADS.isMemberOfMADSScheme, class_name: "MadsScheme"
  property :temporal, predicate: DAMS.temporal, class_name: "MadsTemporal"
  property :topic, predicate: DAMS.topic, class_name: "MadsTopic"
  accepts_nested_attributes_for :complexSubject, :scheme, :temporal, :topic
end
class Record < ActiveFedora::Base
  has_metadata :name=>"damsMetadata", :type=>DamsDatastream
  has_attributes :complexSubject, :scheme, :temporal, :topic, datastream: 'damsMetadata', multiple: false
end

# scheme
scheme_params = {
  scheme_attributes: [{
    id: 'http://library.ucsd.edu/ark:20775/bb1111111x',
    name: 'Library of Congress Subject Headings',
    code: 'lcsh',
    externalAuthority: RDF::Resource.new('http://id.loc.gov/vocabulary/subjects')
  }]
}
scheme = Record.new()
scheme.damsMetadata.attributes = scheme_params
puts "standalone scheme:\n\n" + scheme.damsMetadata.content

# topic
topic_params = {
  topic_attributes: [{
    id: 'http://library.ucsd.edu/ark:20775/bb2222222x',
    name: 'Civilization, Modern',
    externalAuthority: RDF::Resource.new('http://id.loc.gov/authorities/subjects/sh85026469'),
    elementList_attributes: [
      { topicElement_attributes: [{elementValue:"Civilization, Modern"}] }
    ],
    scheme_attributes: scheme_params[:scheme_attributes]
  }]
}
topic = Record.new()
topic.damsMetadata.attributes = topic_params
puts "\ntopic:\n\n" + topic.damsMetadata.content

# temporal
temporal_params = {
  temporal_attributes: [{
    id: 'http://library.ucsd.edu/ark:20775/bb3333333x',
    name: '20th century',
    externalAuthority: RDF::Resource.new('http://id.loc.gov/authorities/subjects/sh85139020'),
    elementList_attributes: [
      { temporalElement_attributes: [{elementValue:"20th century"}] }
    ],
    scheme_attributes: scheme_params[:scheme_attributes]
  }]
}
temporal = Record.new()
temporal.damsMetadata.attributes = temporal_params
puts "\ntemporal:\n\n" + temporal.damsMetadata.content

# complex subject
complex_subject_params = {
  complexSubject_attributes: [{
    id: 'http://library.ucsd.edu/ark:20775/bb4444444x',
    name: 'Civilization, Modern--20th century',
    externalAuthority: RDF::Resource.new('http://id.loc.gov/authorities/subjects/sh85026473'),
    componentList_attributes: [{
      topic_attributes: topic_params[:topic_attributes],
      temporal_attributes: temporal_params[:temporal_attributes]
    }],
    scheme_attributes: scheme_params[:scheme_attributes]
  }]
}
subject = Record.new()
subject.damsMetadata.attributes = complex_subject_params
puts "\ncomplex subject:\n\n" + subject.damsMetadata.content