Re: Are empty R2RML mappings valid?

Take the test case out?

Additionally, something I brought up offline to Boris: for the cases that
have non-conforming R2RML mappings, if a system generates an empty file...
is that wrong?

Juan Sequeda
+1-575-SEQ-UEDA
www.juansequeda.com


On Sat, Jun 16, 2012 at 9:04 AM, Richard Cyganiak <richard@cyganiak.de>wrote:

> We have an R2RML test case that asserts: An empty R2RML mapping is
> allowed, and generates an empty output dataset.
> http://www.w3.org/2001/sw/rdb2rdf/test-cases/#R2RMLTC0007g
>
> But the R2RML spec says:
>
> [[
> An R2RML mapping defines a mapping from a relational database to RDF. It
> is a structure that consists of one or more triples maps.
> ]]
> http://www.w3.org/TR/r2rml/#dfn-r2rml-mapping
>
> The empty graph encodes zero triples maps, and thus is not an R2RML
> mapping according to this definition.
>
> That's a contradiction that needs to be fixed one way or the other. I
> don't have much of an opinion on which way we should go. Anyone else has an
> opinion?
>
> Best,
> Richard
>