Module: RDF::Vocabulary::Term

Includes:
Resource
Defined in:
lib/rdf/vocabulary.rb

Overview

A Vocabulary Term is a Resource that can also act as an Enumerable to generate the RDF definition of vocabulary terms as defined within the vocabulary definition.

Terms include #attributes where values a embedded resources, lists or other terms. This allows, for example, navigation of a concept heirarchy.

Term attributes can also be accessed using #properties where the attribute values are transformed into different types of RDF::Value. Properties can be indexed by key, where a key is defined (See ATTR_URIs), absolute URI, or PName, where the prefix is associated with a loaded vocabulary.

Constant Summary collapse

ATTR_URIs =

Look up URIs for attribute symbols

Returns:

{
  allValuesFrom:      RDF::URI("http://www.w3.org/2002/07/owl#allValuesFrom"),
  altLabel:           RDF::URI("http://www.w3.org/2004/02/skos/core#altLabel"),
  broader:            RDF::URI("http://www.w3.org/2004/02/skos/core#broader"),
  cardinality:        RDF::URI("http://www.w3.org/2002/07/owl#cardinality"),
  comment:            RDF::URI("http://www.w3.org/2000/01/rdf-schema#comment"),
  definition:         RDF::URI("http://www.w3.org/2004/02/skos/core#definition"),
  domain:             RDF::URI("http://www.w3.org/2000/01/rdf-schema#domain"),
  domainIncludes:     RDF::URI("http://schema.org/domainIncludes"),
  editorialNote:      RDF::URI("http://www.w3.org/2004/02/skos/core#editorialNote"),
  equivalentClass:    RDF::URI("http://www.w3.org/2002/07/owl#equivalentClass"),
  equivalentProperty: RDF::URI("http://www.w3.org/2002/07/owl#equivalentProperty"),
  exactMatch:         RDF::URI("http://www.w3.org/2004/02/skos/core#exactMatch"),
  hasTopConcept:      RDF::URI("http://www.w3.org/2004/02/skos/core#hasTopConcept"),
  inScheme:           RDF::URI("http://www.w3.org/2004/02/skos/core#inScheme"),
  intersectionOf:     RDF::URI("http://www.w3.org/2002/07/owl#intersectionOf"),
  inverseOf:          RDF::URI("http://www.w3.org/2002/07/owl#inverseOf"),
  isDefinedBy:        RDF::URI("http://www.w3.org/2000/01/rdf-schema#isDefinedBy"),
  label:              RDF::URI("http://www.w3.org/2000/01/rdf-schema#label"),
  maxCardinality:     RDF::URI("http://www.w3.org/2002/07/owl#maxCardinality"),
  member:             RDF::URI("http://www.w3.org/2004/02/skos/core#member"),
  minCardinality:     RDF::URI("http://www.w3.org/2002/07/owl#minCardinality"),
  narrower:           RDF::URI("http://www.w3.org/2004/02/skos/core#narrower"),
  notation:           RDF::URI("http://www.w3.org/2004/02/skos/core#notation"),
  note:               RDF::URI("http://www.w3.org/2004/02/skos/core#note"),
  onProperty:         RDF::URI("http://www.w3.org/2002/07/owl#onProperty"),
  prefLabel:          RDF::URI("http://www.w3.org/2004/02/skos/core#prefLabel"),
  range:              RDF::URI("http://www.w3.org/2000/01/rdf-schema#range"),
  rangeIncludes:      RDF::URI("http://schema.org/rangeIncludes"),
  related:            RDF::URI("http://www.w3.org/2004/02/skos/core#related"),
  someValuesFrom:     RDF::URI("http://www.w3.org/2002/07/owl#someValuesFrom"),
  subClassOf:         RDF::URI("http://www.w3.org/2000/01/rdf-schema#subClassOf"),
  subPropertyOf:      RDF::URI("http://www.w3.org/2000/01/rdf-schema#subPropertyOf"),
  type:               RDF::URI("http://www.w3.org/1999/02/22-rdf-syntax-ns#type"),
  unionOf:            RDF::URI("http://www.w3.org/2002/07/owl#unionOf"),
}.freeze
URI_ATTRs =

Look up attribute symbols from URIs

Returns:

ATTR_URIs.invert.freeze

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Resource

#resource?

Methods included from Term

#<=>, #==, #compatible?, #eql?, #escape, #term?, #terms, #to_base, #to_term

Methods included from RDF::Value

#anonymous?, #canonicalize, #canonicalize!, #constant?, #graph?, #inspect!, #invalid?, #iri?, #list?, #literal?, #node?, #resource?, #start_with?, #statement?, #term?, #to_nquads, #to_ntriples, #to_rdf, #to_term, #type_error, #uri?, #validate!, #variable?

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method, *args, &block) ⇒ Object (protected)

Implement accessor to symbol attributes



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# File 'lib/rdf/vocabulary.rb', line 1274

def method_missing(method, *args, &block)
  case method
  when :comment, :notation, :note, :editorialNote, :definition
    attribute_value(method)
  when :label, :altLabel, :prefLabel
    # Defaults to URI fragment or path tail
    begin
      attribute_value(method)
    rescue KeyError
      to_s.split(/[\/\#]/).last
    end
  when :type, :subClassOf, :subPropertyOf, :domain, :range, :isDefinedBy,
       :allValuesFrom, :cardinality, :equivalentClass, :equivalentProperty,
       :imports, :intersectionOf, :inverseOf, :maxCardinality, :minCardinality,
       :onProperty, :someValuesFrom, :unionOf,
       :domainIncludes, :rangeIncludes,
       :broader, :exactMatch, :hasTopConcept, :inScheme, :member, :narrower, :related

    # Return value as an Array, unless it is a list
    case value = attribute_value(method)
    when Array, RDF::List then value
    else [value].compact
    end
  else
    super
  end
end

Instance Attribute Details

#allValuesFrom ⇒ Array<Term> (readonly)

owl:allValuesFrom accessor

Returns:




# File 'lib/rdf/vocabulary.rb', line 826

#altLabel ⇒ Literal+ (readonly)

skos:altLabel accessor

Returns:




# File 'lib/rdf/vocabulary.rb', line 867

#attributes ⇒ Hash{Symbol => String, Term, Hash{Symbol => String}, Array<String, Term, Hash{Symbol => String}>} (readonly)

Note:

lookup by PName is DEPRECATED and will be removed in a future version.

Attributes of this vocabulary term, used for finding label and comment and to serialize the term back to RDF.

Attributes are indexed by symbol. Symbols directly interpreted by a term are the accessors defined for the RDF::Vocabulary::Term class, also in ATTR_URIs. Other keys are interpreted as absolute URIs or PNames for properties defined on this term.

Symbols which are accessors may also be looked up by their associated URI.

Values may be Strings, Hash (Map), or Terms, or an Array including a combination of these. A Hash (Map) is used to create a datatype/language map to one or more string values which represent either datatyped literals, or language-tagged literals as interpreted by #attribute_value.

In general, this accessor is used internally. The #properties method interprets these values as RDF::Value.

Examples:

looking up term label

RDF::RDFS.Literal.attributes[:label] #=> "Literal"
RDF::RDFS.Literal.attributes[:"rdfs:label"] #=> "Literal"
RDF::RDFS.Literal.attributes[RDF::RDFS.label] #=> "Literal"
RDF::RDFS.Literal.attributes["http://www.w3.org/2000/01/rdf-schema#label"] #=> "Literal"
RDF::RDFS.Literal.attributes[:"http://www.w3.org/2000/01/rdf-schema#label"] #=> "Literal"

Returns:

  • (Hash{Symbol => String, Term, Hash{Symbol => String}, Array<String, Term, Hash{Symbol => String}>})

See Also:



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# File 'lib/rdf/vocabulary.rb', line 933

def attributes
  @attributes
end

#broader ⇒ Array<Term> (readonly)

skos:broader accessor

Returns:




# File 'lib/rdf/vocabulary.rb', line 867

#cardinality ⇒ Array<Literal> (readonly)

owl:cardinality accessor

Returns:




# File 'lib/rdf/vocabulary.rb', line 826

#comment ⇒ Literal+ (readonly)

rdfs:comment accessor

Returns:




# File 'lib/rdf/vocabulary.rb', line 801

#definition ⇒ Literal+ (readonly)

skos:definition accessor

Returns:




# File 'lib/rdf/vocabulary.rb', line 867

#domain ⇒ Array<Term> (readonly)

rdfs:domain accessor

Returns:




# File 'lib/rdf/vocabulary.rb', line 801

#domainIncludes ⇒ Array<Term> (readonly)

schema:domainIncludes accessor

Returns:




# File 'lib/rdf/vocabulary.rb', line 860

#editorialNote ⇒ Literal+ (readonly)

skos:editorialNote accessor

Returns:




# File 'lib/rdf/vocabulary.rb', line 867

#equivalentClass ⇒ Array<Term> (readonly)

owl:equivalentClass accessor

Returns:




# File 'lib/rdf/vocabulary.rb', line 826

#equivalentProperty ⇒ Array<Term> (readonly)

owl:equivalentProperty accessor

Returns:




# File 'lib/rdf/vocabulary.rb', line 826

#exactMatch ⇒ Array<Term> (readonly)

skos:exactMatch accessor

Returns:




# File 'lib/rdf/vocabulary.rb', line 867

#hasTopConcept ⇒ Array<Term> (readonly)

skos:hasTopConcept accessor

Returns:




# File 'lib/rdf/vocabulary.rb', line 867

#inScheme ⇒ Array<Term> (readonly)

skos:inScheme accessor

Returns:




# File 'lib/rdf/vocabulary.rb', line 867

#intersectionOf ⇒ Array<Term> (readonly)

owl:intersectionOf accessor

Returns:




# File 'lib/rdf/vocabulary.rb', line 826

#inverseOf ⇒ Array<Term> (readonly)

owl:inverseOf accessor

Returns:




# File 'lib/rdf/vocabulary.rb', line 826

#isDefinedBy ⇒ Array<Term> (readonly)

rdfs:isDefinedBy accessor

Returns:




# File 'lib/rdf/vocabulary.rb', line 801

#label ⇒ Literal (readonly)

rdfs:label accessor

Returns:




# File 'lib/rdf/vocabulary.rb', line 801

#maxCardinality ⇒ Array<Literal> (readonly)

owl:maxCardinality accessor

Returns:




# File 'lib/rdf/vocabulary.rb', line 826

#member ⇒ Array<Term> (readonly)

skos:member accessor

Returns:




# File 'lib/rdf/vocabulary.rb', line 867

#minCardinality ⇒ Array<Literal> (readonly)

owl:minCardinality accessor

Returns:




# File 'lib/rdf/vocabulary.rb', line 826

#narrower ⇒ Array<Term> (readonly)

skos:narrower accessor

Returns:




# File 'lib/rdf/vocabulary.rb', line 867

#notation ⇒ Literal+ (readonly)

skos:notation accessor

Returns:




# File 'lib/rdf/vocabulary.rb', line 867

#note ⇒ Literal+ (readonly)

skos:note accessor

Returns:




# File 'lib/rdf/vocabulary.rb', line 867

#onProperty ⇒ Array<Term> (readonly)

owl:onProperty accessor

Returns:




# File 'lib/rdf/vocabulary.rb', line 826

#prefLabel ⇒ Literal (readonly)

skos:prefLabel accessor

Returns:




# File 'lib/rdf/vocabulary.rb', line 867

#range ⇒ Array<Term> (readonly)

rdfs:range accessor

Returns:




# File 'lib/rdf/vocabulary.rb', line 801

#rangeIncludes ⇒ Array<Term> (readonly)

schema:rangeIncludes accessor

Returns:




# File 'lib/rdf/vocabulary.rb', line 860

#related ⇒ Array<Term> (readonly)

skos:related accessor

Returns:




# File 'lib/rdf/vocabulary.rb', line 867

#someValuesFrom ⇒ Array<Term> (readonly)

owl:someValuesFrom accessor

Returns:




# File 'lib/rdf/vocabulary.rb', line 826

#subClassOf ⇒ Array<Term> (readonly)

rdfs:subClassOf accessor

Returns:




# File 'lib/rdf/vocabulary.rb', line 801

#subPropertyOf ⇒ Array<Term> (readonly)

rdfs:subPropertyOf accessor

Returns:




# File 'lib/rdf/vocabulary.rb', line 801

#type ⇒ Array<Term> (readonly)

rdf:type accessor

Returns:




# File 'lib/rdf/vocabulary.rb', line 801

#unionOf ⇒ List<Term>, Array<Term> (readonly)

owl:unionOf accessor

Returns:




# File 'lib/rdf/vocabulary.rb', line 826

#vocab ⇒ RDF::Vocabulary (readonly)

Vocabulary of this term.

Returns:



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# File 'lib/rdf/vocabulary.rb', line 911

def vocab
  @vocab
end

Class Method Details

.intern(str, *args, **options) ⇒ RDF::URI

Returns an interned RDF::URI instance based on the given uri string.

The maximum number of cached interned URI references is given by the CACHE_SIZE constant. This value is unlimited by default, in which case an interned URI object will be purged only when the last strong reference to it is garbage collected (i.e., when its finalizer runs).

Excepting special memory-limited circumstances, it should always be safe and preferred to construct new URI references using RDF::URI.intern instead of RDF::URI.new, since if an interned object can’t be returned for some reason, this method will fall back to returning a freshly-allocated one.

Parameters:

Returns:

  • (RDF::URI) —

    an immutable, frozen URI object



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# File 'lib/rdf/vocabulary.rb', line 1008

def self.intern(str, *args, **options)
  (URI.cache[(str = str.to_s).to_sym] ||= self.new(str, *args, **options)).freeze
end

.new(uri, attributes: , vocab: , **options) ⇒ Object .new(attributes: , vocab: , **options) ⇒ Object

Overloads:

  • .new(uri, attributes: , vocab: , **options) ⇒ Object

    Parameters:

    • uri (URI, String, #to_s)
    • vocab (Vocabulary) (defaults to: ) —

      Vocabulary of this term.

    • attributes (Hash{Symbol => String,Term,Hash{Symbol=>String,Array<String>},Array<String>}) (defaults to: ) —

      ({}) Attributes of this vocabulary term, used for finding label and comment and to serialize the term back to RDF. See #attributes and #properties for other ways to access.

    • options (Hash{Symbol => Object}) —

      Options from URI#initialize

  • .new(attributes: , vocab: , **options) ⇒ Object

    Parameters:

    • vocab (Vocabulary) (defaults to: ) —

      Vocabulary of this term.

    • attributes (Hash{Symbol => String,Term,Hash{Symbol=>String,Array<String>},Array<String>}) (defaults to: ) —

      ({}) Attributes of this vocabulary term, used for finding label, comment and other term properties, and to serialize the term back to RDF. See #attributes and #properties for other ways to access.

    • options (Hash{Symbol => Object}) —

      Options from URI#initialize



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# File 'lib/rdf/vocabulary.rb', line 950

def self.new(*args, vocab: nil, attributes: {}, **options)
  klass = if args.first.nil?
    RDF::Node
  elsif args.first.is_a?(Hash)
    args.unshift(nil)
    RDF::Node
  elsif args.first.to_s.start_with?("_:")
    args = args[1..-1].unshift($1)
    RDF::Node
  else RDF::URI
  end

  # Create default proc on attributes to allow lookup by different key types.
  attributes = attributes.dup if attributes.frozen?
  attributes.default_proc = -> (hash, key) do
    sym = case key
    when RDF::URI
      URI_ATTRs.fetch(key, key.to_s.to_sym)
    when String
      URI_ATTRs.fetch(RDF::URI(key), key.to_s.to_sym)
    when Symbol
      case key.to_s
      when /^https?:/
        # Lookup by associated attribute, or pname
        URI_ATTRs.fetch(RDF::URI(key.to_s), RDF::URI(key).pname.to_sym)
      when /:/
        uri = RDF::Vocabulary.expand_pname(key)
        # Lookup by associated attribute or URI
        URI_ATTRs.fetch(uri, uri.to_s.to_sym)
      end
    end
    hash.fetch(sym, nil)
  end

  term = klass.allocate.extend(Term)
  term.send(:initialize, *args)
  term.instance_variable_set(:@vocab, vocab)
  term.instance_variable_set(:@attributes, attributes)
  term
end

Instance Method Details

#attribute_value(prop) ⇒ RDF::Value+

Values of an attributes as RDF::Value.

Attribute values are returned as either an RDF::Value or Array<RDf::Value if there is more than one value.

Attribute values which are not already a RDF::Value (including strings and symbols) are converted by a heuristic loookup as follows:

Parameters:

  • prop (Symbol)

Returns:



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# File 'lib/rdf/vocabulary.rb', line 1111

def attribute_value(prop)
  values = attributes[prop]
  return nil if values.nil?
  values = [values].compact unless values.is_a?(Array)
  prop_values = values.map do |value|
    v = value.is_a?(Symbol) ? value.to_s : value
    value = (RDF::Vocabulary.expand_pname(v) rescue nil) if v.is_a?(String) && v.include?(':')
    value = value.to_uri if value.respond_to?(:to_uri)
    value = if value.is_a?(RDF::Value) && value.valid?
      value
    elsif value.is_a?(Hash)
      # type/language map
      value.inject([]) do |memo, (k,v)|
        vv = [v] unless v.is_a?(Array)
        memo << if k.to_s.include?(':')
          dt = RDF::Vocabulary.expand_pname(v) rescue nil
          vv.map {|val| RDF::Literal(val, datatype: dt)}
        else
          vv.map {|val| RDF::Literal(val, language: k)}
        end
      end.flatten.compact.select(&:valid?)
    else
      # Use as most appropriate literal
      [
        RDF::Literal::Date,
        RDF::Literal::DateTime,
        RDF::Literal::Integer,
        RDF::Literal::Decimal,
        RDF::Literal::Double,
        RDF::Literal::Boolean,
        RDF::Literal
      ].inject(nil) do |m, klass|
        m || begin
          l = klass.new(v)
          l if l.valid?
        end
      end
    end
  end.flatten

  prop_values.length <= 1 ? prop_values.first : prop_values
end

#class? ⇒ Boolean

Is this a class term?

Returns:

  • (Boolean) 


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# File 'lib/rdf/vocabulary.rb', line 1036

def class?
  Array(self.type).any? {|t| t.to_s.include?('Class')}
end

#datatype? ⇒ Boolean

Is this a class term?

Returns:

  • (Boolean) 


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# File 'lib/rdf/vocabulary.rb', line 1050

def datatype?
  Array(self.type).any? {|t| t.to_s.include?('Datatype')}
end

#domain_includes ⇒ RDF::URI

Accessor for schema:domainIncludes

Returns:



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# File 'lib/rdf/vocabulary.rb', line 1223

def domain_includes
  domainIncludes
end

#dup ⇒ RDF::URI

Returns a duplicate copy of self.

Returns:



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# File 'lib/rdf/vocabulary.rb', line 1016

def dup
  term = super.extend(Term)
  term.instance_variable_set(:@vocab, vocab)
  term.instance_variable_set(:@attributes, attributes)
  term
end

#each_statement {|| ... } ⇒ Object

Enumerate each statement constructed from the defined vocabulary terms

If a property value is known to be a URI, or expands to a URI, the object is a URI, otherwise, it will be a Literal.

Yields:

  • statement

Yield Parameters:



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# File 'lib/rdf/vocabulary.rb', line 1161

def each_statement
  attributes.keys.each do |p|
    prop = ATTR_URIs.fetch(p) { RDF::Vocabulary::expand_pname(p)}
    values = attribute_value(p)
    values = [values].compact unless values.is_a?(Array)
    values.each do |value|
      yield RDF::Statement(self, prop, value) if prop.is_a?(RDF::URI)

      # Enumerate over value statements, if enumerable
      if value.is_a?(RDF::Enumerable) || (value.is_a?(Term) && value.node?)
        value.each_statement {|s| yield s}
      end
    end
  end
end

#enum_for(method = :each_statement, *args) ⇒ RDF::Enumerable::Enumerator Also known as: to_enum

Return an enumerator over Statement defined for this vocabulary.

Returns:

See Also:

  • Object#enum_for


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# File 'lib/rdf/vocabulary.rb', line 1181

def enum_for(method = :each_statement, *args)
  # Ensure that enumerators are, themselves, queryable
  this = self
  Enumerable::Enumerator.new do |yielder|
    this.send(method, *args) {|*y| yielder << (y.length > 1 ? y : y.first)}
  end
end

#inspect ⇒ String

Returns a String representation of the URI object’s state.

Returns:

  • (String) —

    The URI object’s state, as a String.



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# File 'lib/rdf/vocabulary.rb', line 1194

def inspect
  sprintf("#<%s:%#0x ID:%s>", Term.to_s, self.object_id, self.to_s)
end

#other? ⇒ Boolean

Is this neither a class, property or datatype term?

Returns:

  • (Boolean) 


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# File 'lib/rdf/vocabulary.rb', line 1064

def other?
  Array(self.type).none? {|t| t.to_s.match?(/(Class|Property|Datatype|Restriction)/)}
end

#properties ⇒ Hash{Symbol => Array<RDF::Value>}

Note:

lookup by PName is DEPRECATED and will be removed in a future version.

Enumerate attributes with values transformed into RDF::Value instances Uses an empty hash with a default_proc which looks up values in attributes. The prevents specific attributes from being evaluated until acessed.

Properties are indexed by symbol. Symbols directly interpreted by a term are the accessors defined for the RDF::Vocabulary::Term class, also in ATTR_URIs. Other keys are interpreted as absolute URIs or PNames for properties defined on this term.

Symbols which are accessors may also be looked up by their associated URI.

Examples:

looking up term label

RDF::RDFS.Literal.label #=> RDF::Literal("Literal")
RDF::RDFS.Literal.properties[:label] #=> RDF::Literal("Literal")
RDF::RDFS.Literal.properties[:"rdfs:label"] #=> RDF::Literal("Literal")
RDF::RDFS.Literal.properties[RDF::RDFS.label] #=> RDF::Literal("Literal")
RDF::RDFS.Literal.properties["http://www.w3.org/2000/01/rdf-schema#label"] #=> RDF::Literal("Literal")
RDF::RDFS.Literal.properties[:"http://www.w3.org/2000/01/rdf-schema#label"] #=> RDF::Literal("Literal")

Returns:

See Also:



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# File 'lib/rdf/vocabulary.rb', line 1088

def properties
  Hash.new {|hash, key| attribute_value(key)}
end

#property? ⇒ Boolean

Is this a class term?

Returns:

  • (Boolean) 


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# File 'lib/rdf/vocabulary.rb', line 1043

def property?
  Array(self.type).any? {|t| t.to_s.include?('Property')}
end

#range_includes ⇒ RDF::URI

Accessor for schema:rangeIncludes

Returns:



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# File 'lib/rdf/vocabulary.rb', line 1229

def range_includes
  rangeIncludes
end

#respond_to?(method, include_all = false) ⇒ Boolean

Implement accessor to symbol attributes

Returns:

  • (Boolean) 


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# File 'lib/rdf/vocabulary.rb', line 1199

def respond_to?(method, include_all = false)
  case method
  when :comment, :notation, :note, :editorialNote, :definition,
       :label, :altLabel, :prefLabel, :type, :isDefinedBy
    true
  when :subClassOf, :subPropertyOf,
       :domainIncludes, :rangeIncludes,
       :equivalentClass, :intersectionOf, :unionOf
    self.class?
  when :domain, :range, :equivalentProperty, :inverseOf
    self.property?
  when :allValuesFrom, :cardinality,
       :maxCardinality, :minCardinality,
       :onProperty, :someValuesFrom
    self.restriction?
  when :broader, :exactMatch, :hasTopConcept, :inScheme, :member, :narrower, :related
    @attributes.key?(method)
  else
    super
  end
end

#restriction? ⇒ Boolean

Is this a Restriction term?

Returns:

  • (Boolean) 


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# File 'lib/rdf/vocabulary.rb', line 1057

def restriction?
  Array(self.type).any? {|t| t.to_s.include?('Restriction')}
end

#to_ruby(indent: "") ⇒ String

Serialize back to a Ruby source initializer. This is used primarily by Writer.

Parameters:

  • indent (String) (defaults to: "")

Returns:

  • (String) 


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# File 'lib/rdf/vocabulary.rb', line 1238

def to_ruby(indent: "")
  "term(" +
  (self.uri? ? self.to_s.inspect + ",\n" : "\n") +
  "#{indent}  " +
  attributes.keys.sort.map do |k|
    values = attribute_value(k)
    values = [values].compact unless values.is_a?(Array)
    values = values.map do |value|
      if value.is_a?(Literal) && %w(: comment definition notation note editorialNote).include?(k.to_s)
        "%(#{value.to_s.gsub('(', '\(').gsub(')', '\)')})"
      elsif value.node? && value.is_a?(RDF::Vocabulary::Term)
        "#{value.to_ruby(indent: indent + "  ")}"
      elsif value.is_a?(RDF::Term)
        "#{value.to_s.inspect}"
      elsif value.is_a?(RDF::List)
        list_elements = value.map do |u|
          if u.uri?
            "#{u.to_s.inspect}"
          elsif u.node? && u.respond_to?(:to_ruby)
            u.to_ruby(indent: indent + "  ")
          else
            "#{u.to_s.inspect}"
          end
        end
        "list(#{list_elements.join(', ')})"
      else
        "#{value.inspect}"
      end
    end
    "#{k.to_s.include?(':') ? k.to_s.inspect : k}: " +
    (values.length == 1 ? values.first : ('[' + values.join(',') + ']'))
  end.join(",\n#{indent}  ") + "\n#{indent})"

end

#valid? ⇒ Boolean

Determine if the URI is a valid according to RFC3987

Returns:

  • (Boolean) —

    true or false

Since:

  • 0.3.9



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# File 'lib/rdf/vocabulary.rb', line 1028

def valid?
  # Validate relative to RFC3987
  node? || RDF::URI::IRI.match?(to_s) || false
end