diff --git a/plugins/virtuoso/lib/virtuoso_plugin/noosfero_harvest.rb b/plugins/virtuoso/lib/virtuoso_plugin/noosfero_harvest.rb
new file mode 100644
index 0000000..758658f
--- /dev/null
+++ b/plugins/virtuoso/lib/virtuoso_plugin/noosfero_harvest.rb
@@ -0,0 +1,110 @@
+class VirtuosoPlugin::NoosferoHarvest
+
+  COMMON_MAPPING = {
+    :type => {:predicate => "http://purl.org/dc/terms/type", :value => lambda {|s, t| t.class.name}},
+    :created_at => {:predicate => "http://purl.org/dc/terms/created"},
+    :updated_at => {:predicate => "http://purl.org/dc/terms/modified"},
+  }
+
+  ARTICLE_MAPPING = {
+    :title => {:predicate => "http://purl.org/dc/terms/title"},
+    :abstract => {:predicate => "http://purl.org/dc/terms/abstract"},
+    :body => {:predicate => "http://purl.org/dc/terms/description"},
+    :part_of => {:predicate => "http://purl.org/dc/terms/isPartOf", :value => lambda {|s, t| url_for(s.url)} },
+    :published_at => {:predicate => "http://purl.org/dc/terms/issued"},
+    :author => {:predicate => "http://purl.org/dc/terms/creator", :value => lambda {|s, t| url_for(t.author_url) if t.author_url} },
+  }
+  PROFILE_MAPPING = {
+    :name => {:predicate => "http://purl.org/dc/terms/title"},
+    :public? => {:predicate => "http://purl.org/socialparticipation/opa#publicProfile"},
+  }
+  COMMENT_MAPPING = {
+    :title => {:predicate => "http://purl.org/dc/terms/title"},
+    :body => {:predicate => "http://purl.org/dc/terms/description"},
+    :part_of => {:predicate => "http://purl.org/dc/terms/isPartOf", :value => lambda {|s, t| url_for(s.url)} },
+    :author => {:predicate => "http://purl.org/dc/terms/creator", :value => lambda {|s, t| url_for(t.author_url) if t.author_url} },
+  }
+  FRIENDSHIP_MAPPING = {
+    :knows => {:predicate => "http://xmlns.com/foaf/0.1/knows", :value => lambda {|s, t| url_for(t.url)} },
+    :type => nil, :created_at => nil, :updated_at => nil,
+  }
+
+  def initialize(environment)
+    @environment = environment
+    @graph = environment.top_url
+  end
+
+  attr_reader :environment
+
+  def plugin
+    @plugin ||= VirtuosoPlugin.new(self)
+  end
+
+  delegate :settings, :to => :plugin
+
+  include Rails.application.routes.url_helpers
+
+  def triplify_comments(article)
+    article.comments.each do |comment|
+      subject_identifier = url_for(comment.url)
+      puts "triplify #{subject_identifier} comment"
+      triplify_mappings(COMMENT_MAPPING, subject_identifier, article, comment)
+    end
+  end
+
+  def triplify_articles(profile)
+    profile.articles.public.each do |article|
+      subject_identifier = url_for(article.url)
+      puts "triplify #{subject_identifier} article"
+      triplify_mappings(ARTICLE_MAPPING, subject_identifier, profile, article)
+      triplify_comments(article)
+    end
+  end
+
+  def triplify_friendship(person)
+    person.friends.each do |friend|
+      subject_identifier = url_for(person.url)
+      puts "triplify #{subject_identifier} friendship"
+      triplify_mappings(FRIENDSHIP_MAPPING, subject_identifier, person, friend)
+    end
+  end
+
+  def triplify_profiles
+    environment.profiles.each do |profile|
+      subject_identifier = url_for(profile.url)
+      puts "triplify #{subject_identifier} profile"
+      triplify_mappings(PROFILE_MAPPING, subject_identifier, environment, profile)
+      triplify_articles(profile) if profile.public?
+      triplify_friendship(profile) if profile.person?
+    end
+  end
+
+  def run
+    triplify_profiles
+  end
+
+  protected
+
+  def triplify_mappings(mapping, subject_identifier, source, target)
+    COMMON_MAPPING.merge(mapping).each do |k, v|
+      next unless v
+      value = nil
+      if v[:value]
+        value = v[:value].kind_of?(Proc) ? v[:value].call(source, target) : v[:value]
+      elsif target.respond_to?(k)
+        value = target.send(k)
+      end
+      insert_triple(RDF::URI.new(subject_identifier), RDF::URI.new(v[:predicate]), value) if value.present?
+    end
+  end
+
+  def insert_triple(subject, predicate, value)
+    value = RDF::URI.new(value) if value.kind_of?(String) && /https?:\/\//.match(value)
+    value = RDF::Literal::DateTime.new(value) if value.kind_of?(ActiveSupport::TimeWithZone)
+    value = RDF::Literal::Boolean.new(value) if !!value == value
+
+    query = RDF::Virtuoso::Query.insert_data([RDF::URI.new(subject), RDF::URI.new(predicate), value]).graph(RDF::URI.new(@graph))
+    plugin.virtuoso_client.insert(query)
+  end
+
+end
--
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