Re: [dotNetRDF-Develop] connecting to a BrighstarDB store from dotnetRDF

[Rob V. <rv...@do...>]

Ivan

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You have not done anything obviously wrong.

The error you get implies that the store in question is not responding with
a valid content type for the query.  You can enable the HTTP debugging
feature - 
https://bitbucket.org/dotnetrdf/dotnetrdf/wiki/HowTo/Debug%20HTTP%20Communic
ation.wiki#!debugging-http-communication -  to see the HTTP headers being
received (they are printed to the Debug console) which would be helpful to
see what content type Brightstar is responding with.

Rob

From:  Iván Palomares <iva...@gm...>
Reply-To:  dotNetRDF Developer Discussion and Feature Request
<dot...@li...>
Date:  Monday, 1 December 2014 12:02
To:  <dot...@li...>
Subject:  [dotNetRDF-Develop] connecting to a BrighstarDB store from
dotnetRDF

> Hi, 
> I'm currently trying to make a first connection from a .NET project with
> dotnetRDF, to a BrightstarDB remote endpoint in which I have a triplestore.
> The code I use is quite simple, just try to connect and execute a "trival"
> SPARQL query, as follows (<IP>, <PORT> and <STORE_NAME> stand for the existing
> address 
> and triplestore name I want to access):
> 
> namespace ConsoleApplication3
> {
> class ReadFromBrightstarDB
> {
>     static void Main(string[] args)
>     {
>         //Create a connection to BrightstarDB SPARQL Query endpoint
>         SparqlConnector connect = new SparqlConnector(new
> Uri("http://<IP>:<PORT>/brightstar/<STORE_NAME>"));
>         PersistentTripleStore store = new PersistentTripleStore(connect);
> 
>         Object results = store.ExecuteQuery("SELECT * WHERE {?s ?p ?o}");
>         if(results is SparqlResultSet)
>         {
>             //Print out the results
>             SparqlResultSet rset = (SparqlResultSet)results;
>             foreach (SparqlResult result in rset)
>             {
>                 Console.WriteLine(result.ToString());
>             }
>         }
> 
>     }
> }
> }
> When executing, I obtain an exception entitled "RDFParseException was
> unhandled", with the following description:
> 
> An unhandled exception of type 'VDS.RDF.Parsing.RdfParseException' occurred in
> dotNetRDF.dll 
> Additional information: Unable to Parse a SPARQL Result Set from the provided
> XML since the Document Element is not a <sparql> element!
> 
> Any help would be appreciate, I'm quite new to .NET in general and
> BrightStarDB as well as to SparQL, so maybe there is a very silly issue here
> but I couldn't find it yet.
> Thanks! 
> Iván
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