Class: RdfsRulebook

Inherits:
Ruleby::Rulebook
  • Object
show all
Defined in:
lib/pomegranate/rdfs_rulebook.rb

Direct Known Subclasses

RdfsPlusRulebook

Instance Method Summary collapse

Instance Method Details

#rdfs_domain ⇒ Object

Implements Type Propagation through rdfs:domain

Semantics

Given:
P rdfs:domain D
x P y

Infer:
x rdf:type D

Example

p = Triple.new("mit:majored_in", "rdfs:domain", ":student"); 
h = Triple.new(":Pius", "mit:majored_in", ":Course_17") 
assert p; assert h;  #=> infers a triple ~= Triple.new(":Pius", "rdf:type", ":student")

Author:

  • Pius Uzamere



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# File 'lib/pomegranate/rdfs_rulebook.rb', line 124

def rdfs_domain
end

#rdfs_range ⇒ Object

Implements Type Propagation through rdfs:range

Semantics

Given:
P rdfs:range R
x P y

Infer:
y rdf:type R

Example

p = Triple.new("mit:majored_in", "rdfs:range", ":major"); 
h = Triple.new(":Pius", "mit:majored_in", ":Course_17") 
assert p; assert h;  #=> infers a triple ~= Triple.new(":Pius", "rdf:type", ":student")

Author:

  • Pius Uzamere



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# File 'lib/pomegranate/rdfs_rulebook.rb', line 153

def rdfs_range
end

#rdfs_rules ⇒ Object

nodoc



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# File 'lib/pomegranate/rdfs_rulebook.rb', line 42

def rdfs_rules
  
  ## 
  # Implements Type Propagation through rdfs:subClassOf
  #
  # ==== Semantics
  #   Given:
  #   A rdfs:subClassOf B
  #   r rdf:type A
  #
  #   Infer:
  #   r rdf:type B
  #
  # ==== Example
  #   p = Triple.new(":Pius", "rdf:type", ":male"); 
  #   h = Triple.new(":male", "rdfs:subClassOf", ":human") 
  #   assert p; assert h;  #=> infers a triple ~= Triple.new(":Pius", "rdf:type", ":human")
  #
  # @author Pius Uzamere
  def rdfs_sub_class_of
  end
  
  rule :rdfs_sub_class_of,
  #TODO: add a patch to ruleby whereby the parser will raise when there's a no method error (e.g. m.subj)
    [Triple,:fact,{m.subject => :subj, m.object=>:obj},m.predicate=="rdf:type"],
    [Triple,:ont_statement,{m.object => :inferred_class },m.predicate=="rdfs:subClassOf", m.subject == b(:obj)],
    [:not, Triple, m.predicate=="rdf:type", m.subject==b(:subj), m.object==b(:inferred_class)] do |v|
      inferred_class = v[:ont_statement].object
      subj = v[:fact].subject
      assert Triple.new(subj, "rdf:type", inferred_class)
      puts "Made type inference based on rdfs:subClassOf: Triple(#{subj}, rdf:type, #{inferred_class})"  
  end
  

  ## 
  # Implements Type Propagation through rdfs:subPropertyOf
  #
  # ==== Semantics
  #   Given:
  #   P rdfs:subPropertyOf R
  #   A P B
  #
  #   Infer:
  #   A R B
  #
  # ==== Example
  #   p = Triple.new(":Pius", "mit:majored_in", ":Course_6"); 
  #   h = Triple.new("mit:majored_in", "rdfs:subPropertyOf", "mit:took_some_classes_in") 
  #   assert p; assert h;  #=> infers a triple ~= Triple.new(":Pius", "mit:took_some_classes_in", ":Course_6")
  #
  # @author Pius Uzamere
  def rdfs_sub_property_of
  end
  
  rule :rdfs_sub_property_of,
    [Triple,:fact,{m.predicate=>:pred, m.subject => :subj, m.object=>:obj}],
    [Triple,:ont_statement, {m.object => :inferred_pred}, m.predicate=="rdfs:subPropertyOf", m.subject == b(:pred)],
    [:not, Triple, m.predicate==b(:inferred_pred), m.subject==b(:subj), m.object==b(:obj)] do |v|
      inferred_property = v[:ont_statement].object
      subj = v[:fact].subject
      obj = v[:fact].object
      assert Triple.new(subj, inferred_property, obj)
      puts "Made type inference based on subPropertyOf: Triple(#{subj},#{inferred_property}, #{obj})"  
  end
  
  ## 
  # Implements Type Propagation through rdfs:domain
  #
  # ==== Semantics
  #   Given:
  #   P rdfs:domain D
  #   x P y
  #
  #   Infer:
  #   x rdf:type D
  #
  # ==== Example
  #   p = Triple.new("mit:majored_in", "rdfs:domain", ":student"); 
  #   h = Triple.new(":Pius", "mit:majored_in", ":Course_17") 
  #   assert p; assert h;  #=> infers a triple ~= Triple.new(":Pius", "rdf:type", ":student")
  #
  # @author Pius Uzamere
  def rdfs_domain
  end
  
  rule :rdfs_domain,
    [Triple,:fact,{m.predicate=>:pred}],
    [Triple,:ont_statement,m.predicate=="rdfs:domain", m.subject == b(:pred)] do |v|
      inferred_type = v[:ont_statement].object
      subj = v[:fact].subject
      assert Triple.new(subj, "rdf:type", inferred_type)
      puts "Made type inference based on rdfs:domain: Triple(#{subj},rdf:type, #{inferred_type})"  
  end
  
  ## 
  # Implements Type Propagation through rdfs:range
  #
  # ==== Semantics
  #   Given:
  #   P rdfs:range R
  #   x P y
  #
  #   Infer:
  #   y rdf:type R
  #
  # ==== Example
  #   p = Triple.new("mit:majored_in", "rdfs:range", ":major"); 
  #   h = Triple.new(":Pius", "mit:majored_in", ":Course_17") 
  #   assert p; assert h;  #=> infers a triple ~= Triple.new(":Pius", "rdf:type", ":student")
  #
  # @author Pius Uzamere
  def rdfs_range
  end
  
  rule :rdfs_range,
    [Triple,:fact,{m.predicate=>:pred}],
    [Triple,:ont_statement,m.predicate=="rdfs:range", m.subject == b(:pred)] do |v|
      inferred_type = v[:ont_statement].object
      subj = v[:fact].object
      assert Triple.new(subj, "rdf:type", inferred_type)
      puts "Made type inference based on rdfs:range: Triple(#{subj},rdf:type, #{inferred_type})"  
  end
  
end

#rdfs_sub_class_of ⇒ Object

Implements Type Propagation through rdfs:subClassOf

Semantics

Given:
A rdfs:subClassOf B
r rdf:type A

Infer:
r rdf:type B

Example

p = Triple.new(":Pius", "rdf:type", ":male"); 
h = Triple.new(":male", "rdfs:subClassOf", ":human") 
assert p; assert h;  #=> infers a triple ~= Triple.new(":Pius", "rdf:type", ":human")

Author:

  • Pius Uzamere



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# File 'lib/pomegranate/rdfs_rulebook.rb', line 61

def rdfs_sub_class_of
end

#rdfs_sub_property_of ⇒ Object

Implements Type Propagation through rdfs:subPropertyOf

Semantics

Given:
P rdfs:subPropertyOf R
A P B

Infer:
A R B

Example

p = Triple.new(":Pius", "mit:majored_in", ":Course_6"); 
h = Triple.new("mit:majored_in", "rdfs:subPropertyOf", "mit:took_some_classes_in") 
assert p; assert h;  #=> infers a triple ~= Triple.new(":Pius", "mit:took_some_classes_in", ":Course_6")

Author:

  • Pius Uzamere



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# File 'lib/pomegranate/rdfs_rulebook.rb', line 93

def rdfs_sub_property_of
end

#rules ⇒ Object 



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# File 'lib/pomegranate/rdfs_rulebook.rb', line 37

def rules
  rdfs_rules
end