module RDF::Reasoner::RDFS
Rules for generating RDFS
entailment triples
Extends ‘RDF::URI` and `RDF::Statement` with specific entailment capabilities
Public Class Methods
# File lib/rdf/reasoner/rdfs.rb, line 360 def self.included(mod) mod.add_entailment :subClassOf, :_entail_subClassOf mod.add_entailment :subClass, :_entail_subClass mod.add_entailment :subPropertyOf, :_entail_subPropertyOf mod.add_entailment :subProperty, :_entail_subProperty mod.add_entailment :domain, :_entail_domain mod.add_entailment :range, :_entail_range end
Public Instance Methods
For a Statement: yield or return inferred statements having an rdf:type of the domain of the statement predicate @todo Should be able to entail owl:unionOf, which is a BNode. This should be allowed, and also add BNode values of that node, recursively, similar to SPARQL concise_bounded_description.uu @private
# File lib/rdf/reasoner/rdfs.rb, line 204 def _entail_domain case self when RDF::Statement statements = [] if term = (RDF::Vocabulary.find_term(self.predicate) rescue nil) term.domain.each do |t| next if t.node? # Don't entail BNodes statements << RDF::Statement(**self.to_h.merge(predicate: RDF.type, object: t, inferred: true)) end end #$stderr.puts("domain(#{self.predicate.pname}): #{statements.map(&:object).map {|r| r.respond_to?(:pname) ? r.pname : r.to_ntriples}}}") statements.each {|s| yield s} if block_given? statements else [] end end
For a Statement: if object is a resource, yield or return inferred statements having an rdf:type of the range of the statement predicate @todo Should be able to entail owl:unionOf, which is a BNode. This should be allowed, and also add BNode values of that node, recursively, similar to SPARQL concise_bounded_description.uu @private
# File lib/rdf/reasoner/rdfs.rb, line 225 def _entail_range case self when RDF::Statement statements = [] if object.resource? && term = (RDF::Vocabulary.find_term(self.predicate) rescue nil) term.range.each do |t| next if t.node? # Don't entail BNodes statements << RDF::Statement(**self.to_h.merge(subject: self.object, predicate: RDF.type, object: t, inferred: true)) end end #$stderr.puts("range(#{self.predicate.pname}): #{statements.map(&:object).map {|r| r.respond_to?(:pname) ? r.pname : r.to_ntriples}}") statements.each {|s| yield s} if block_given? statements else [] end end
For a Term: yield or return inferred subClass relationships by recursively applying to named sub classes to get a complete set of classes in the descendant chain of this class For a Statement: this is a no-op, as it’s not useful in this context @private
# File lib/rdf/reasoner/rdfs.rb, line 92 def _entail_subClass case self when RDF::URI, RDF::Node unless class? yield self if block_given? return Array(self) end terms = descendant_cache[self] ||= ( Array(self.subClass). map {|c| c._entail_subClass rescue c}. flatten + Array(self) ).compact terms.each {|t| yield t} if block_given? terms else [] end end
For a Term: yield or return inferred subClassOf relationships by recursively applying to named super classes to get a complete set of classes in the ancestor chain of this class For a Statement: if predicate is ‘rdf:types`, yield or return inferred statements having a subClassOf relationship to the type of this statement @todo Should be able to entail owl:Restriction, which is a BNode. This should be allowed, and also add BNode values of that node, recursively, similar to SPARQL concise_bounded_description.uu @private
# File lib/rdf/reasoner/rdfs.rb, line 56 def _entail_subClassOf case self when RDF::URI, RDF::Node unless class? yield self if block_given? return Array(self) end terms = subClassOf_cache[self] ||= ( Array(self.subClassOf). map {|c| c._entail_subClassOf rescue c}. flatten + Array(self) ).compact terms.each {|t| yield t} if block_given? terms when RDF::Statement statements = [] if self.predicate == RDF.type if term = (RDF::Vocabulary.find_term(self.object) rescue nil) term._entail_subClassOf do |t| next if t.node? # Don't entail BNodes statements << RDF::Statement(**self.to_h.merge(object: t, inferred: true)) end end #$stderr.puts("subClassf(#{self.predicate.pname}): #{statements.map(&:object).map {|r| r.respond_to?(:pname) ? r.pname : r.to_ntriples}}}") end statements.each {|s| yield s} if block_given? statements else [] end end
For a Term: yield or return inferred subProperty relationships by recursively applying to named subproperties to get a complete set of properties in the descendant chain of this property
For a Statement: this is a no-op, as it’s not useful in this context @private
# File lib/rdf/reasoner/rdfs.rb, line 164 def _entail_subProperty case self when RDF::URI, RDF::Node unless property? yield self if block_given? return Array(self) end terms = descendant_property_cache[self] ||= ( Array(self.subProperty).map do |c| c._entail_subProperty rescue c end.flatten + Array(self)).compact terms.each {|t| yield t } if block_given? terms else [] end end
For a Term: yield or return inferred subPropertyOf relationships by recursively applying to named super classes to get a complete set of classes in the ancestor chain of this class For a Statement: yield or return inferred statements having a subPropertyOf relationship to predicate of this statements @private
# File lib/rdf/reasoner/rdfs.rb, line 127 def _entail_subPropertyOf case self when RDF::URI, RDF::Node unless property? yield self if block_given? return Array(self) end terms = subPropertyOf_cache[self] ||= ( Array(self.subPropertyOf). map {|c| c._entail_subPropertyOf rescue c}. flatten + Array(self) ).compact terms.each {|t| yield t} if block_given? terms when RDF::Statement statements = [] if term = (RDF::Vocabulary.find_term(self.predicate) rescue nil) term._entail_subPropertyOf do |t| statements << RDF::Statement(**self.to_h.merge(predicate: t, inferred: true)) end #$stderr.puts("subPropertyOf(#{self.predicate.pname}): #{statements.map(&:object).map {|r| r.respond_to?(:pname) ? r.pname : r.to_ntriples}}}") end statements.each {|s| yield s} if block_given? statements else [] end end
@return [RDF::Util::Cache] @private
# File lib/rdf/reasoner/rdfs.rb, line 26 def descendant_cache @@descendant_cache ||= RDF::Util::Cache.new(-1) end
@return [RDF::Util::Cache] @private
# File lib/rdf/reasoner/rdfs.rb, line 47 def descendant_property_cache @@descendant_property_cache ||= RDF::Util::Cache.new(-1) end
RDFS
requires that if the property has a domain, and the resource has a type that some type matches every domain.
Note that this is different than standard entailment, which simply asserts that the resource has every type in the domain, but this is more useful to check if published data is consistent with the vocabulary definition.
@param [RDF::Resource] resource @param [RDF::Queryable] queryable @param [Hash{Symbol => Object}] options ({}) @option options [Array<RDF::Vocabulary::Term>] :types
Fully entailed types of resource, if not provided, they are queried
# File lib/rdf/reasoner/rdfs.rb, line 252 def domain_compatible_rdfs?(resource, queryable, options = {}) raise RDF::Reasoner::Error, "#{self} can't get domains" unless property? domains = Array(self.domain).reject(&:node?) - [RDF::OWL.Thing, RDF::RDFS.Resource] # Fully entailed types of the resource types = options.fetch(:types) do queryable.query({subject: resource, predicate: RDF.type}). map {|s| (t = (RDF::Vocabulary.find_term(s.object)) rescue nil) && t.entail(:subClassOf)}. flatten. uniq. compact end unless domains.empty? # Every domain must match some entailed type Array(types).empty? || domains.all? {|d| types.include?(d)} end
RDFS
requires that if the property has a range, and the resource has a type that some type matches every range. If the resource is a datatyped Literal, and the range includes a datatype, the resource must be consistent with that.
Note that this is different than standard entailment, which simply asserts that the resource has every type in the range, but this is more useful to check if published data is consistent with the vocabulary definition.
@param [RDF::Resource] resource @param [RDF::Queryable] queryable @param [Hash{Symbol => Object}] options ({}) @option options [Array<RDF::Vocabulary::Term>] :types
Fully entailed types of resource, if not provided, they are queried
# File lib/rdf/reasoner/rdfs.rb, line 279 def range_compatible_rdfs?(resource, queryable, options = {}) raise RDF::Reasoner::Error, "#{self} can't get ranges" unless property? if !(ranges = Array(self.range).reject(&:node?) - [RDF::OWL.Thing, RDF::RDFS.Resource]).empty? if resource.literal? ranges.all? do |range| if [RDF::RDFS.Literal, RDF.XMLLiteral, RDF.HTML].include?(range) true # Don't bother checking for validity elsif range == RDF.langString # Value must have a language resource.has_language? elsif range.start_with?(RDF::XSD) # XSD types are valid if the datatype matches, or they are plain and valid according to the grammar of the range resource.datatype == range || resource.plain? && RDF::Literal.new(resource.value, datatype: range).valid? elsif range.start_with?("http://ogp.me/ns/class#") case range when RDF::URI("http://ogp.me/ns/class#boolean_str") [RDF::URI("http://ogp.me/ns/class#boolean_str"), RDF::XSD.boolean].include?(resource.datatype) || resource.plain? && RDF::Literal::Boolean.new(resource.value).valid? when RDF::URI("http://ogp.me/ns/class#date_time_str") # Schema.org date based on ISO 8601, mapped to appropriate XSD types for validation case resource when RDF::Literal::Date, RDF::Literal::Time, RDF::Literal::DateTime, RDF::Literal::Duration resource.valid? else ISO_8601.match(resource.value) end when RDF::URI("http://ogp.me/ns/class#determiner_str") # The lexical space: "", "the", "a", "an", and "auto". resource.plain? && (%w(the a an auto) + [""]).include?(resource.value) when RDF::URI("http://ogp.me/ns/class#float_str") # A string representation of a 64-bit signed floating point number. Example lexical values include "1.234", "-1.234", "1.2e3", "-1.2e3", and "7E-10". [RDF::URI("http://ogp.me/ns/class#float_str"), RDF::Literal::Double, RDF::Literal::Float].include?(resource.datatype) || resource.plain? && RDF::Literal::Double.new(resource.value).valid? when RDF::URI("http://ogp.me/ns/class#integer_str") resource.is_a?(RDF::Literal::Integer) || [RDF::URI("http://ogp.me/ns/class#integer_str")].include?(resource.datatype) || resource.plain? && RDF::Literal::Integer.new(resource.value).valid? when RDF::URI("http://ogp.me/ns/class#mime_type_str") # Valid mime type strings \(e.g., "application/mp3"\). [RDF::URI("http://ogp.me/ns/class#mime_type_str")].include?(resource.datatype) || resource.plain? && resource.value =~ %r(^[\w\-\+]+/[\w\-\+]+$) when RDF::URI("http://ogp.me/ns/class#string") resource.plain? when RDF::URI("http://ogp.me/ns/class#url") # A string of Unicode characters forming a valid URL having the http or https scheme. u = RDF::URI(resource.value) resource.datatype == RDF::URI("http://ogp.me/ns/class#url") || resource.datatype == RDF::XSD.anyURI || resource.simple? && u.valid? && u.scheme.to_s =~ /^https?$/ else # Unknown datatype false end else false end end else # Fully entailed types of the resource types = options.fetch(:types) do queryable.query({subject: resource, predicate: RDF.type}). map {|s| (t = (RDF::Vocabulary.find_term(s.object) rescue nil)) && t.entail(:subClassOf)}. flatten. uniq. compact end # If any type is a class, add rdfs:Class if types.any? {|t| t.is_a?(RDF::Vocabulary::Term) && t.class?} && !types.include?(RDF::RDFS.Class) types << RDF::RDFS.Class end # Every range must match some entailed type Array(types).empty? || ranges.all? {|d| types.include?(d)} end else true end end
Get the immediate subclasses of this class.
This iterates over terms defined in the vocabulary of this term, as well as the vocabularies imported by this vocabulary. @return [Array<RDF::Vocabulary::Term>]
# File lib/rdf/reasoner/rdfs.rb, line 116 def subClass raise RDF::Reasoner::Error, "#{self} Can't entail subClass" unless class? subClass_cache[self] ||= ([self.vocab] + self.vocab.imported_from).map do |v| Array(v.properties).select {|p| p.class? && Array(p.subClassOf).include?(self)} end.flatten.compact end
@return [RDF::Util::Cache] @private
# File lib/rdf/reasoner/rdfs.rb, line 12 def subClassOf_cache @@subClassOf_cache ||= RDF::Util::Cache.new(-1) end
@return [RDF::Util::Cache] @private
# File lib/rdf/reasoner/rdfs.rb, line 19 def subClass_cache @@subClass_cache_cache ||= RDF::Util::Cache.new(-1) end
Get the immediate subproperties of this property.
This iterates over terms defined in the vocabulary of this term, as well as the vocabularies imported by this vocabulary. @return [Array<RDF::Vocabulary::Term>]
# File lib/rdf/reasoner/rdfs.rb, line 189 def subProperty raise RDF::Reasoner::Error, "#{self} Can't entail subProperty" unless property? vocabs = [self.vocab] + self.vocab.imported_from subProperty_cache[self] ||= vocabs.map do |v| Array(v.properties).select do |p| p.property? && Array(p.subPropertyOf).include?(self) end end.flatten.compact end
@return [RDF::Util::Cache] @private
# File lib/rdf/reasoner/rdfs.rb, line 33 def subPropertyOf_cache @@subPropertyOf_cache ||= RDF::Util::Cache.new(-1) end
@return [RDF::Util::Cache] @private
# File lib/rdf/reasoner/rdfs.rb, line 40 def subProperty_cache @@subProperty_cache ||= RDF::Util::Cache.new(-1) end