Class: N::Namespace

Inherits:
URI
  • Object
show all
Defined in:
lib/semantic_naming/namespace.rb,
lib/semantic_naming/default_namespaces.rb

Overview

This is for URIs that act as namespaces. A namespace is a “prefix” for URIs.

Shortcuts for some default namespaces are automatically defined (rdf, owl, …). See default_namespaces.rb for details.

Usually there should be no need to change those default namespaces

Constant Summary collapse

@@default_namespaces = 
{
  'rdf' => "http://www.w3.org/1999/02/22-rdf-syntax-ns#",
  'xsd' => "http://www.w3.org/2001/XMLSchema#",
  'rdfs' => "http://www.w3.org/2000/01/rdf-schema#",
  'owl' => "http://www.w3.org/2002/07/owl#"
}

Instance Method Summary collapse

Methods inherited from URI

#+, #==, [], #const_missing, #domain_of?, #domain_part, #eql?, from_encoded, #hash, #initialize, is_uri?, #local?, #local_name, make_uri, #method_missing, #my_shortcut, #namespace, #rdf_label, #remote?, #safe_encoded, shortcut, shortcut_exists?, shortcuts, #to_name_s, #to_s, #to_uri, #to_yaml

Constructor Details

This class inherits a constructor from N::URI

Dynamic Method Handling

This class handles dynamic methods through the method_missing method in the class N::URI

Instance Method Details

#elements_with_type(type, element_type = N::URI) ⇒ Object

Finds all members of the given type that are part of this namespace. Attention: Due to the workings of SPARQL this will retrieve all elements that match the type and filter them. Thus it’s advised to use this only for types of which only a few elements are known to exist (e.g. Onotology classes)



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# File 'lib/semantic_naming/namespace.rb', line 20

def elements_with_type(type, element_type = N::URI)
  return unless(rdf_active? && is_iri?)
  qry = ActiveRDF::Query.new(element_type).distinct.select(:s)
  qry.where(:s, RDF.type, type)
  qry.regexp(:s, "^#{@uri_s}")
  qry.execute
end

#predicates ⇒ Object

Returns a list of predicate names.



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# File 'lib/semantic_naming/namespace.rb', line 29

def predicates
  elements_with_type(N::RDF.Property, N::Predicate).map { |p| p.local_name }
end