.value

This wiki serves as structure documentation for .value design choice with voices pro and against.

excerpts from original chat:

timbl Like you can say in turtle

<#pi>  =  math:Pi,  3.14159 .

That will smush to a node which has two URIs, and the value a decimal number.

— https://gitter.im/rdfjs/public?at=56d61e05b01413547d894cff

timbl

In pi = 3.141
x = pi + 1
what is the name of x? what is the value of x?
x ’s name is ‘x’
x’s value is 4.141

that’s how i think of these things

— https://gitter.im/rdfjs/public?at=56d6264806ba9a282a285667

Other languages

ruby

http://www.rubydoc.info/github/ruby-rdf/rdf/master/frames#RDF_Object_Model

RDF:URI & RDF:IRI as alias (.value) https://github.com/ruby-rdf/rdf/blob/develop/lib/rdf/model/uri.rb#L808-L819

    ##
    # lexical representation of URI, either absolute or relative
    # @return [String] 
    def value
      @value ||= [
        ("#{scheme}:" if absolute?),
        ("//#{authority}" if authority),
        path,
        ("?#{query}" if query),
        ("##{fragment}" if fragment)
      ].compact.join("")
    end

RDF:Node for blank node (.id and no .value) https://github.com/ruby-rdf/rdf/blob/develop/lib/rdf/model/node.rb#L78-L86

    # @return [String]
    attr_accessor :id

    ##
    # @param  [#to_s] id
    def initialize(id = nil)
      id = nil if id.to_s.empty?
      @id = (id || "g#{__id__.to_i.abs}").to_s
    end

RDF:Literal (.value) https://github.com/ruby-rdf/rdf/blob/develop/lib/rdf/model/literal.rb#L177-L183

    ##
    # Returns the value as a string.
    #
    # @return [String]
    def value
      @string || to_s
    end

at the same time @gkellogg +1 using NamedNode https://gitter.im/rdfjs/Representation-Task-Force?at=56e5ecd06fde057c26866591

python

https://rdflib.readthedocs.org/en/stable/apidocs/rdflib.html#module-rdflib.term

• rdflib.term.URIRef
• rdflib.term.BNode
• rdflib.term.Literal ( .value )

uses value as parameter name for parent clas rdflib.term.Identifier

• https://rdflib.readthedocs.org/en/stable/apidocs/rdflib.html#rdflib.term.Identifier.__new__

hash

• https://rdflib.readthedocs.org/en/stable/apidocs/rdflib.html#rdflib.term.Identifier.__hash__

str

• https://rdflib.readthedocs.org/en/stable/apidocs/rdflib.html#rdflib.term.URIRef.__str__
• https://rdflib.readthedocs.org/en/stable/apidocs/rdflib.html#rdflib.term.BNode.__str__
• https://rdflib.readthedocs.org/en/stable/apidocs/rdflib.html#rdflib.term.Literal.__str__

See also

https://www.w3.org/TR/2012/REC-owl2-primer-20121211/#Entity_Declarations

 :John    rdf:type owl:NamedIndividual .
 :Person  rdf:type owl:Class .
 :hasWife rdf:type owl:ObjectProperty .
 :hasAge  rdf:type owl:DatatypeProperty .

https://www.w3.org/TR/2012/REC-owl2-syntax-20121211/#Named_Individuals

https://lists.w3.org/Archives/Public/public-data-shapes-wg/2014Dec/0274.html

ex:two rdf:type xsd:Integer .
ex:two ex:prime xsd:true .

https://www.w3.org/TR/rdf-schema/#ch_value

<http://www.example.com/2002/04/products#item10245>
    <http://www.example.org/terms/weight> [
       rdf:value 2.4 ;
       <http://www.example.org/terms/units> <http://www.example.org/units/kilograms>
       ] .

other programming languages

• https://github.com/RDFLib/rdflib/blob/master/examples/smushing.py