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class Person < ActiveTriples::Resource
  configure :type => RDF::FOAF.Person, :base_uri => 'http://example.org/people#'  
  property :name, :predicate => RDF::FOAF.name  
end  

class Organization< ActiveTriples::Resource
  configure :type => RDF::FOAF.Organization, :base_uri => "http://example.org/orgs#"
  property :name, :predicate => RDF::FOAF.name
end  

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RDF in Hydra Workshop

Tom Johnson & Karen Estlund

This workshop provides an overview of the current state of RDF on the Hydra platform. We will work through examples of modeling complex metadata and creating objects that use it. The content will highlight creative use of Hydra 7's RDF capabilities to manage controlled vocabularies and integrate with Linked Data sources. Participants should expect some technical content, but need not be developers to benefit.

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Property-Predicate Semantics in ActiveTriples

ActiveTriples is an Object-to-Graph Mapper (OGM) providing ActiveModel friendly, ORM-like functionality for managing RDF resources and graphs as Objects in Ruby.

The library defines a Resource class, instances of which represent the equivalent concept in RDF. Resource objects encapsulate an individual RDF Resource (i.e. its identifier (URI or blank node), and relevant statements) creating a corresponding Object schema and API. The Object schema is strictly non-normative with respect to the data structure and content of the associated RDF graph. That is to say, it is a design goal of ActiveTriples that any arbitrary RDF graph should be readable and safely writeable using the library and compatible with any Object schema. To achieve this goal, it is necessary to specify a clear Object-Graph semanti

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before do
  class DummyLicense < ActiveTriples::Resource
    property :title, :predicate => RDF::DC.title
  end

  class DummyResource < ActiveTriples::Resource
    configure :type => RDF::URI('http://example.org/SomeClass')
    property :license, :predicate => RDF::DC.license, :class_name => DummyLicense
    property :title, :predicate => RDF::DC.title
    property :replaces, :predicate => RDF::DC.replaces

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NOTIFIED: [frontend | restart unicorn] **************************************** 
<192.168.50.6> ESTABLISH CONNECTION FOR USER: tom
<192.168.50.6> REMOTE_MODULE service name=unicorn_frontend state=reloaded
<192.168.50.6> EXEC ['ssh', '-C', '-tt', '-vvv', '-o', 'ControlMaster=auto', '-o', 'ControlPersist=60s', '-o', 'ControlPath=/home/tjohnson/.ansible/cp/ansible-ssh-%h-%p-%r', '-o', 'KbdInteractiveAuthentication=no', '-o', 'PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey', '-o', 'PasswordAuthentication=no', '-o', 'User=tom', '-o', 'ConnectTimeout=10', '192.168.50.6', "/bin/sh -c 'mkdir -p $HOME/.ansible/tmp/ansible-tmp-1409156132.72-28508570131040 && chmod a+rx $HOME/.ansible/tmp/ansible-tmp-1409156132.72-28508570131040 && echo $HOME/.ansible/tmp/ansible-tmp-1409156132.72-28508570131040'"]
<192.168.50.6> PUT /tmp/tmp2jNjg7 TO /home/tom/.ansible/tmp/ansible-tmp-1409156132.72-28508570131040/service
<192.168.50.6> EXEC ['ssh', '-C', '-tt', '-vvv', '-o', 'ControlMaster=auto', '-o', 'Contr

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Validation Use Cases

Basic Validation

• Presence of Required Fields
• Cardinality of Fields with Max Values
• Domain & Range Restrictions on Properties
• Controlled Vocabulary Compliance

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require 'spec_helper'
require 'mongoid'

describe 'Mongoid integration' do
  before do
    class Person
      include Mongoid::Document
      include ActiveTriples::Identifiable

      configure	:base_uri => 'http://example.org/mongoid/'

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In [10]: DplaGeonamesGeocoder().enrich_place(place)
---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-10-346d292dde39> in <module>()
----> 1 DplaGeonamesGeocoder().enrich_place(place)

/home/tjohnson/src/dpla/ingestion/ENV/lib/python2.7/site-packages/dplaingestion/akamod/geocode.pyc in enrich_place(self, place)
    295             hierarchy = self.reverse_geocode_hierarchy(lat, lng, ["PCLI", # Country
    296                                                                   "ADM1", # State
--> 297                                                                   "ADM2"]) # County

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# lib/models/datastream.rb

class CHODatastream < ActiveFedora::NtriplesRDFDatastream
  property :title, predicate: RDF::DC.title
  property :creator, predicate: RDF::DC.creator
  property :date, predicate: RDF::DC.date
  property :location, predicate: RDF::DC.spatial
end

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{ 'sourceResource': { 'DIFFERENT VALUES': { 'CURRENT DICT: ': { u'spatial': [ { u'coordinates': u'39.95233, -75.16379',
                                                                                u'country': u'United States',
                                                                                u'county': u'Philadelphia County',
                                                                                u'name': u'Philadelphia, PA',
                                                                                u'state': u'Pennsylvania'},
                                                                              { u'coordinates': u'37.77493, -122.41942',
                                                                                u'country': u'United States',
                                                                                u'county': u'San Francisco County',
                                                                                u'name': u'San Francisco, CA',