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CODE4LIB  November 2013

CODE4LIB November 2013

Subject:

Re: rdf serialization

From:

Aaron Rubinstein <[log in to unmask]>

Reply-To:

Code for Libraries <[log in to unmask]>

Date:

Sun, 3 Nov 2013 09:10:56 -0500

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (102 lines)

It’s probably worth pointing out that DC elements is a (soon to be deprecated, I think) flavor of DC that’s not really set up for RDF. DC terms[1] has an ontology that explicitly defines the domain and range for many of the predicates and for creator[2], it defines the range as an Agent[3], not a string. In other words, you want a URI representing a typed Thing as an object for dc:creator.

Best,

Aaron Rubinstein


[1] http://dublincore.org/documents/dcmi-terms/#H2
[2] http://dublincore.org/documents/dcmi-terms/#terms-creator
[3] http://dublincore.org/documents/dcmi-terms/#terms-Agent
On Nov 3, 2013, at 6:05 AM, Esmé Cowles <[log in to unmask]> wrote:

> Eric-
>
> I think dc:creator is supposed to take a string instead of an object or URI. So I think you should use a different predicate, which takes a class as an object. Then you can have an object that describes Thomas Jefferson and include both his name and gender, links to authority records, etc.:
>
> <rdf:RDF
> xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
> xmlns:dc="http://purl.org/dc/elements/1.1/"
> xmlns:foaf="http://xmlns.com/foaf/0.1/"
> xmlns:owl="http://www.w3.org/2002/07/owl#"
> xmlns:foo="http://foo.org/">
>
> <!-- the Declaration Of Independence was authored by Thomas Jefferson, who is male -->
> <rdf:Description
> rdf:about="http://www.archives.gov/exhibits/charters/declaration_transcript.html">
> <dc:creator>Thomas Jefferson</dc:creator>
> <foo:creator>
> <foaf:Person rdf:about="http://www.worldcat.org/identities/lccn-n79-89957">
> <foaf:name>Thomas Jefferson</foaf:name>
> <foaf:gender>male</foaf:gender>
> <owl:sameAs rdf:resource="http://id.loc.gov/authorities/names/n79089957"/>
> </foaf:Person>
> </foo:creator>
> </rdf:Description>
> </rdf:RDF>
>
> -Esme
> --
> Esme Cowles <[log in to unmask]>
>
> "Men feared witches and burnt women."
> -- Louis Brandeis, Whitney v. California, concurring
>
> On 11/3/2013, at 12:00 AM, Eric Lease Morgan <[log in to unmask]> wrote:
>
>>
>> How can I write an RDF serialization enabling me to express the fact that the United States Declaration Of Independence was written by Thomas Jefferson and Thomas Jefferson was a male? (And thus asserting that the Declaration of Independence was written by a male.)
>>
>> Suppose I have the following assertion:
>>
>> <rdf:RDF
>> xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
>> xmlns:dc="http://purl.org/dc/elements/1.1/" >
>>
>> <!-- the Declaration Of Independence was authored by Thomas Jefferson -->
>> <rdf:Description
>> rdf:about="http://www.archives.gov/exhibits/charters/declaration_transcript.html">
>> <dc:creator>http://www.worldcat.org/identities/lccn-n79-89957</dc:creator>
>> </rdf:Description>
>>
>> </rdf:RDF>
>>
>> Suppose I have a second assertion:
>>
>> <rdf:RDF
>> xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
>> xmlns:foaf="http://xmlns.com/foaf/0.1/">
>>
>> <!-- Thomas Jefferson was a male -->
>> <rdf:Description rdf:about="http://www.worldcat.org/identities/lccn-n79-89957">
>> <foaf:gender>male</foaf:gender>
>> </rdf:Description>
>>
>> </rdf:RDF>
>>
>> Now suppose a cool Linked Data robot came along and harvested my RDF/XML. Moreover lets assume the robot could make the logical conclusion that the Declaration was written by a male. How might the robot express this fact in RDF/XML? The following is my first attempt at such an expression, but the resulting graph (attached) doesn't seem to visually express what I really want:
>>
>> <rdf:RDF
>> xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#”
>> xmlns:foaf="http://xmlns.com/foaf/0.1/“
>> xmlns:dc="http://purl.org/dc/elements/1.1/“>
>>
>> <rdf:Description rdf:about="http://www.worldcat.org/identities/lccn-n79-89957">
>> <foaf:gender>male</foaf:gender>
>> </rdf:Description>
>>
>> <rdf:Description
>> rdf:about="http://www.archives.gov/exhibits/charters/declaration_transcript.html">
>> <dc:creator>http://www.worldcat.org/identities/lccn-n79-89957</dc:creator>
>> </rdf:Description>
>> </rdf:RDF>
>>
>> Am I doing something wrong? How might you encode such the following expression — The Declaration Of Independence was authored by Thomas Jefferson, and Thomas Jefferson was a male. And therefore, the Declaration Of Independence was authored by a male named Thomas Jefferson? Maybe RDF can not express this fact because it requires two predicates in a single expression, and this the expression would not be a triple but rather a “quadrile" — object, predicate #1, subject/object, predicate #2, and subject?
>>
>>
>> —
>> Eric Morgan
>>
>> [cid:[log in to unmask]]
>>
>>

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