ISSUE-16: Should we allow multiple subjects for a logical table row? Also, what if no subject is specified?

subjectMap cardinality

Should we allow multiple subjects for a logical table row? Also, what if no subject is specified?

State:

CLOSED

Product:

R2RML

Raised by:

Ivan Herman

Opened on:

2011-01-24

Description:

Ivan asked this question in his comments [1]. (See the email exchanges since then [2] [3] for more info.):

"
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Issue (maybe to be labelled as suchy in the tracker and added to the text?): what happens exactly when, say, SubjectMapClass is missing for a TriplesMapClass instance? We may not have to answer this in the document, but label that as an issue to be solved (and I guess those are the connection point to the direct mapping!)

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Similar question: what happens if the user adds more than one subjectMaps? I know there is a table at the end of the document that sets maximum cardinality for things. But there is no statements on what the error response of an R2RML processor should be if those cardinality constraints are breached. Taking into account that an R2RML instance is in RDF, we cannot rely on, say, the order within the specification (ie, something like the second coming wins).

We may just open an issue and label it as such in the document for now, b.t.w.
"

[1] http://lists.w3.org/Archives/Public/public-rdb2rdf-wg/2010Dec/0017.html
[2] http://lists.w3.org/Archives/Public/public-rdb2rdf-wg/2010Dec/0025.html
[3] http://lists.w3.org/Archives/Public/public-rdb2rdf-wg/2010Dec/0028.html

Related Actions Items:

• ACTION-96 on Richard Cyganiak to Capture this (multiple subject maps) and other (future) potential error cases in the Wiki (ISSUE-16) - due 2011-05-24, closed

Related emails:

1. ISSUE-16: Multiple subject maps etc (from richard@cyganiak.de on 2011-05-24)
2. Re: RDB2RDF WG agenda for 2011-03-08 meeting 1700 UTC (from michael.hausenblas@deri.org on 2011-03-08)
3. Re: RDB2RDF WG agenda for 2011-03-08 meeting 1700 UTC (from bertails@w3.org on 2011-03-07)
4. RDB2RDF WG agenda for 2011-03-08 meeting 1700 UTC (from michael.hausenblas@deri.org on 2011-03-06)
5. ISSUE-16 (subjectMap cardinality): Should we allow multiple subjects for a logical table row? Also, what if no subject is specified? [R2RML] (from sysbot+tracker@w3.org on 2011-01-24)

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