Re: RDF Collection to XML output

Bardo Nelgen Thu, 18 May 2017 06:16:04 -0700


Hi Lorenz,

thanks for the clarification – but isn’t the Collection as a whole meantto be the query result, rather than its various elements !??


Best,

Bardo


On 18.05.17 13.45 Uhr, Lorenz Buehmann wrote:

Because in SPARQL there is always only a single resource bound to a
variable, in your case ?member and not the whole list


On 18.05.2017 12:18, Bardo Nelgen wrote:

Hi all,

why does the CONSTRUCT SPARQL of

PREFIX rdf:<http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX xsd:<http://www.w3.org/2001/XMLSchema#>
PREFIX as:<https://www.w3.org/ns/activitystreams#>
PREFIX list: <http://jena.hpl.hp.com/ARQ/list#>

CONSTRUCT {<http://resources.semaworx.eu/activity/user/BNNuserPAR>
  as:items    ( ?members )    .}

WHERE{<http://resources.semaworx.eu/activity/user/BNNuserPAR>
  as:items [ list:member ?members ]    .}

produce

   <rdf:Description
rdf:about="http://resources.semaworx.eu/activity/user/BNNuserPAR";>
     <as:items rdf:parseType="Collection">
       <rdf:Description
rdf:about="http://resources.semaworx.eu/activity/user/BNNuserPAR/SHA512UIDdateUID004"/>
     </as:items>
     <as:items rdf:parseType="Collection">
       <rdf:Description
rdf:about="http://resources.semaworx.eu/activity/user/BNNuserPAR/SHA512UIDdateUID003"/>
     </as:items>
     <as:items rdf:parseType="Collection">
       <rdf:Description
rdf:about="http://resources.semaworx.eu/activity/user/BNNuserPAR/SHA512UIDdateUID002"/>
     </as:items>
     <as:items rdf:parseType="Collection">
       <rdf:Description
rdf:about="http://resources.semaworx.eu/activity/user/BNNuserPAR/SHA512UIDdateUID001"/>
     </as:items>
   </rdf:Description>

rather than

   <rdf:Description
rdf:about="http://resources.semaworx.eu/activity/user/BNNuserPAR";>
     <as:items rdf:parseType="Collection">
       <rdf:Description
rdf:about="http://resources.semaworx.eu/activity/user/BNNuserPAR/SHA512UIDdateUID004"/>
       <rdf:Description
rdf:about="http://resources.semaworx.eu/activity/user/BNNuserPAR/SHA512UIDdateUID003"/>
       <rdf:Description
rdf:about="http://resources.semaworx.eu/activity/user/BNNuserPAR/SHA512UIDdateUID002"/>
       <rdf:Description
rdf:about="http://resources.semaworx.eu/activity/user/BNNuserPAR/SHA512UIDdateUID001"/>
     </as:items>
   </rdf:Description>

??

It’s obviously not the same and caused by the iteration over the query
results.

But how could I prevent it from happening without having to create a
separate query for the construction ?

As always, input and references are highly appreciated.

Regards,

Bardo

Re: RDF Collection to XML output

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