Re: [d2rq-dev] Problem with RDF/XML serialization. Is this possible ?

[Richard C. <ri...@cy...>]

Andrea,

Beats me. Can you prepare a *minimal* mapping file that exhibits the problem and share it? Just keep cutting out sections until the problem goes away.

Best,
Richard


On 17 Jan 2012, at 15:44, Andrea Splendiani (RRes-Roth) wrote:

> Hi,
> 
> I have been using d2rq to map a simple DB to RDF. 
> When using the ntriples syntax, everything works well.
> However, I was using the RDF/XML output to a file, and the system seem to invent triples (or to misplace something anyway).
> Is this at all possible ?
> The usage of d2rq is a bit borderline, in that it makes lot of constant values which are the same for the same entities.
> Also many URIs (that the RDF/XML seems to confuse) differ only from a subset.
> 
> Here is an example of what I get:
> 
> Direct mapping to RDF/XML (dump-rdf)
> 
> <rdf:Description rdf:about="codes/TableB/12/12180/bufr">
>    <map2pre:containedIn rdf:resource="codes/TableB/12/12180"/>
>    <map2pre:containedIn rdf:resource="codes/TableB/12/12180"/>
> *    <map2pre:containedIn rdf:resource="codes/TableB/12"/>
> 
> <rdfs:label xml:lang="en">Averaged 12 micron BT for all clear pixels at nadir</rdfs:label>
>    <map2pre:localId>12180</map2pre:localId>
>    <map2pre:status>http://metoffice.gov.uk/terminology/tools/tableMapping#validStatus</map2pre:status>
>    <rdfs:description xml:lang="en"></rdfs:description>
>    <rdf:type rdf:resource="http://metoffice.gov.uk/terminology/tools/tableMapping#codeIndividual"/>
>    <map2pre:containedIn rdf:resource="codes/TableB/12"/>
>    <rdfs:label xml:lang="en">Averaged 12 micron BT for all clear pixels at nadir</rdfs:label>
>    <map2pre:localId>12180</map2pre:localId>
>    <map2pre:status>http://metoffice.gov.uk/terminology/tools/tableMapping#validStatus</map2pre:status>
>    <rdfs:description xml:lang="en"></rdfs:description>
>    <rdf:type rdf:resource="http://metoffice.gov.uk/terminology/tools/tableMapping#codeIndividual"/>
>    <map2pre:containedIn rdf:resource="codes/TableB"/>
>    <rdfs:label>Temperature</rdfs:label>
> 
> *   R <map2pre:nameSpace>12</map2pre:nameSpace>
> *  R <map2pre:hasVersion>0_0_0</map2pre:hasVersion>
>   R <rdf:type rdf:resource="http://metoffice.gov.uk/terminology/tools/tableMapping#codeCollection"/>
>   R <map2pre:containedIn rdf:resource="codes/TableB"/>
>   R <rdfs:label>Temperature</rdfs:label>
> 
> 
>    <rdf:type rdf:resource="http://metoffice.gov.uk/terminology/tools/tableMapping#codeCollection"/>
>    <vocab:BUFR_Unit>K</vocab:BUFR_Unit>
>    <vocab:BUFR_ReferenceValue rdf:datatype="http://www.w3.org/2001/XMLSchema#int">0</vocab:BUFR_ReferenceValue>
>    <vocab:BUFR_DataWidth_Bits rdf:datatype="http://www.w3.org/2001/XMLSchema#int">16</vocab:BUFR_DataWidth_Bits>
>    <vocab:BUFR_Scale rdf:datatype="http://www.w3.org/2001/XMLSchema#int">2</vocab:BUFR_Scale>
>    <rdf:type rdf:resource="http://metoffice.gov.uk/terminology/tools/tableMapping#standard"/>
>    <vocab:BUFR_Unit>K</vocab:BUFR_Unit>
>    <vocab:BUFR_ReferenceValue rdf:datatype="http://www.w3.org/2001/XMLSchema#int">0</vocab:BUFR_ReferenceValue>
>    <vocab:BUFR_DataWidth_Bits rdf:datatype="http://www.w3.org/2001/XMLSchema#int">16</vocab:BUFR_DataWidth_Bits>
>    <vocab:BUFR_Scale rdf:datatype="http://www.w3.org/2001/XMLSchema#int">2</vocab:BUFR_Scale>
>    <rdf:type rdf:resource="http://metoffice.gov.uk/terminology/tools/tableMapping#standard"/>
>  </rdf:Description>
> 
> Where the R block is repeated forever.
> 
> 
> If I map to ntriples (dump-rdf) and the than convert to rdfxml (rapper) :
> 
> <ns2897:standard xmlns:ns2897="http://metoffice.gov.uk/terminology/tools/tableMapping#" rdf:about="http://127.0.0.1:8888/MetOffice2/global/codes/TableB/12/12180/bufr">
>    <ns2898:BUFR_DataWidth_Bits xmlns:ns2898="http://localhost:7777/MetOffice/global/terminology/" rdf:datatype="http://www.w3.org/2001/XMLSchema#int">16</ns2898:BUFR_DataWidth_Bits>
>    <ns2899:BUFR_ReferenceValue xmlns:ns2899="http://localhost:7777/MetOffice/global/terminology/" rdf:datatype="http://www.w3.org/2001/XMLSchema#int">0</ns2899:BUFR_ReferenceValue>
>    <ns2900:BUFR_Scale xmlns:ns2900="http://localhost:7777/MetOffice/global/terminology/" rdf:datatype="http://www.w3.org/2001/XMLSchema#int">2</ns2900:BUFR_Scale>
>    <ns2901:BUFR_Unit xmlns:ns2901="http://localhost:7777/MetOffice/global/terminology/">K</ns2901:BUFR_Unit>
>    <ns2897:containedIn rdf:resource="http://127.0.0.1:8888/MetOffice2/global/codes/TableB/12/12180"/>
>    <rdf:type rdf:resource="http://metoffice.gov.uk/terminology/tools/tableMapping#standard"/>
>  </ns2897:standard>
> 
> 
> Now, forget the namespaces, I guess it's rapper way to represent repeated statements.
> As you can see, some statements that were in the first version are not in the other (indicated with "*").
> 
> Any hint on why this may be ?
> 
> best,
> Andrea Splendiani
> 
> 
> 
> 
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