Values of rdf:value in BIBFRAME do have a datatype: rdfs:literal. That means that unless declared otherwise, it is a string by default. Whenever you want, you can refine a literal
e.g.
(1) rdf: value “10”
(2) rdf:value “10”^^xs:int
The first is a string; the second is an integer. But there is nowhere in BIBFRAME that you would refine a value of rdf:value.
Consider for example a bf:Identifier. BIBFRAME prescribes that you assert the value of the identifier by rdf:value:
bf:identifiedBy [ a bf:Isbn
rdf:value “9783110413014” ] .
“9783110413014” is a string. You could refine it and assert that it’s an integer:
rdf:value “9783110413014”^^xs:int
But you don’t want to do that because it isn’t an integer, it’s just a string. And wherever rdf:value is prescribed in BIBFRAME, it is just a string.
Someday you may be able to assert that it has datatype “isbn”….
rdf:value “9783110413014”^^xyz:isbn
… and that may facilitate processing of the isbn string. But there is no such primitive datatype yet. However the statement “a bf:Isbn” would seem to serve that purpose.
My point being that wherever rdf:value occurs, though there may not be an explicit primitive datatype, the actual datatype is understood by context.
There are datatype properties in BIBFRAME where is makes sense to refine the datatype. Take bf:count or bf:date for example
Someone might declare:
bf:count “10”
and someone else declare:
bf:count “10”^^xs:int
Or
bf:date “June 20, 2016”
vs: bf:date “20160620”^^xdt:date
And in both cases the second form is going to be more easily processed.
But neither of these is supplied via rdf:value; they are datatype properties, for which rdf:value doesn’t apply.
Ray
From: Bibliographic Framework Transition Initiative Forum [mailto:[log in to unmask]] On Behalf Of Joseph Kiegel
Sent: Monday, June 20, 2016 1:18 PM
To: [log in to unmask]
Subject: Re: [BIBFRAME] FW: [BIBFRAME] rdf:value
I agree.
It seems that the object of rdf:value should have a datatype. A good basis for a list of datatypes is the table in RDF Semantics (http://www.w3.org/TR/2004/REC-rdf-mt-20040210/#DTYPEINTERP). These types are widely understood. Of course, local types can be established but they make widespread sharing of data more difficult.
Looked at from this point of view, only one case from the examples of rdf:value in the BIBFRAME specifications fits an xsd datatype: ISBNs are integers. The rest do not conform to a standard datatype.
From: Bibliographic Framework Transition Initiative Forum [mailto:[log in to unmask]] On Behalf Of Fallgren, Nancy (NIH/NLM) [E]
Sent: Monday, June 20, 2016 9:24 AM
To: [log in to unmask]<mailto:[log in to unmask]>
Subject: Re: [BIBFRAME] FW: [BIBFRAME] rdf:value
At NLM, we’ve been asking the same question as Joe in re use of rdf:value v. rdfs:label in the BF 2.0 Item examples. The use of rdf:value with a text string or with common terminology for which there should probably be a URI doesn’t make sense to us either.
It’s pretty clear that W3C defines rdf:value as a ‘structured’ value while rdfs:label is for a human readable label. But the W3C definition of rdf:value as an idiom with no meaning on its own, seems to indicate that it needs to be used within some context. The W3C example in the Primer https://www.w3.org/TR/2004/REC-rdf-primer-20040210/#rdfvalue implies that it should have a datatype (which makes sense for a machine to understand a structured value) as well as another property giving context about the structured value. So, if LC shelf mark has a structured/standard datatype that can be interpreted by machines as an LC Shelf mark, then use of rdf:value could make sense in that context; otherwise, it seems rdfs:label would be preferable.
Also, best practices for sharing LD should probably not entail local interpretation of properties from another vocabulary.
-Nancy
Nancy J. Fallgren
Metadata Specialist Librarian
Cataloging and Metadata Management Section
Technical Services Division
National Library of Medicine
[log in to unmask]<mailto:[log in to unmask]>
From: Hubay Miklós [mailto:[log in to unmask]]
Sent: Monday, June 20, 2016 11:46 AM
To: [log in to unmask]<mailto:[log in to unmask]>
Subject: Re: [BIBFRAME] FW: [BIBFRAME] rdf:value
Imho, the two properties are different. One is for value-declaration, and the other one is "may be used to provide a human-readable version of a resource's name."
https://www.w3.org/TR/rdf-schema/
2016.06.20. 17:34 keltezéssel, Joseph Kiegel írta:
Sorry, I meant rdfs:label.
From: Joseph Kiegel
Sent: Monday, June 20, 2016 8:34 AM
To: 'Bibliographic Framework Transition Initiative Forum' <[log in to unmask]><mailto:[log in to unmask]>
Subject: RE: [BIBFRAME] rdf:value
So is rdfs:value. The question is: what is the “appropriate” difference between the two?
From: Bibliographic Framework Transition Initiative Forum [mailto:[log in to unmask]] On Behalf Of Robert Sanderson
Sent: Monday, June 20, 2016 8:26 AM
To: [log in to unmask]<mailto:[log in to unmask]>
Subject: Re: [BIBFRAME] rdf:value
It's the value of the resource to which it's attached.
On Mon, Jun 20, 2016 at 5:18 PM, Joseph Kiegel <[log in to unmask]<mailto:[log in to unmask]>> wrote:
bf:identifiedBy [ a bf:Isbn
rdf:value “9783110413014” ] .
Example 2
bf:identifiedBy [ a identifier:ABC ;
rdf:value “MX3-387” ] .
Example 3
bf:identifiedBy [ a bf:Identifier ;
bf:source “xyz” ;
rdf:value “1234567890” ] .
There is an ISBN, and its value is 9783...
There is an ABC identifier, and its value is MX3-387
There is an untyped identifier from source system xyz, and it's value is 123...
Notes
Example 3
bf:baseMaterial [
bf:code [ rdf:value “o” ;
bf:source [rdf:value “marc007ng04” ] ] ;
bf:note [ a bf:Note ;
rdfs:label “Image printed on thick gold paper.” ] ] .
There is an untyped resource, which one imagines is a Code, with value "o".
There is an untyped resource, which is some sort of Source, with value "marc007..."
Item
Example (truncated)
<http://bibframe.example.org/item/itemZ>
bf:shelfMarkLcc [rdf:value “LB2395.C65 1991” ] ;
bf:usageAndAccessPolicy [
a bf:AccessPolicy ;
rdf:value “unrestricted” ] .
There is an LCC, and its value is LB...
There is a Policy and its value is "unrestricted"
Note -- this use is not very machine friendly. A better model would have identifiable policies, with their own URIs.
HTH,
Rob
--
Rob Sanderson
Semantic Architect
The Getty Trust
Los Angeles, CA 90049
--
Hubay Miklós
tájékoztató könyvtáros, könyvtárirendszer-adminisztrátor, MTMT-adminisztrátor
Széchenyi István Egyetem Egyetemi Könyvtár
9026 Győr, Egyetem tér 1.
Tel.: 96/613-443
email: [log in to unmask]<mailto:[log in to unmask]>
