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https://issues.apache.org/jira/browse/JENA-195?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Paolo Castagna updated JENA-195:
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    Attachment: JENA-195.patch

Thank you Andy.

This patch improves the javadoc and provides an additional example (i.e. 
ExampleKasabi.java) which needs a Kasabi API key to be run. Maybe not a good 
idea to include this as an example, but this is the real use case where this 
issue come from.
A QueryExecException is thrown if someone overrides a SPARQL protocol query 
parameter via Context.
I'll further improve the documentation, as the code settles. 

Things I am not sure about are: encoding policy and Explain.explain.

QueryEngineHTTP.addParam doesn't encode values, I followed the same approach 
for consistency. Is this the right thing to do?
I need to look more at Explain.explain and find out what's the best way to 
report logging informations.

> Maybe it's time to have a page on the website for all-things-remote, 
> including this feature

If/when a page for all-things-remote is added to the website, I'll add a 
section there when this issue is closed. I am not sure if I know all of the 
all-things-remote.
                
> Allow users to specify query parameters when they use SERVICE 
> <...?name=value> in their SPARQL queries
> ------------------------------------------------------------------------------------------------------
>
>                 Key: JENA-195
>                 URL: https://issues.apache.org/jira/browse/JENA-195
>             Project: Jena
>          Issue Type: Improvement
>          Components: ARQ
>            Reporter: Paolo Castagna
>            Assignee: Paolo Castagna
>            Priority: Minor
>         Attachments: JENA-195.patch, JENA-195.patch
>
>   Original Estimate: 8h
>  Remaining Estimate: 8h
>
> SPARQL endpoints might require or allow additional query parameters, if we 
> want to use those endpoints with SERVICE <...> in SPARQL queries we must 
> support query parameters and allow users to use SERVICE <...?name=value> in 
> their SPARQL queries.
> Service.java can look in the Context for additional parameters. 
> Parameters need to be kept separate and grouped on a per SERVICE endpoint 
> basis (in order to avoid exposing parameter values to wrong places).
> A Map<String, Map<String,List<String>>> can be uses to map SERVICE endpoint 
> URLs to parameter-->values.
> OpService.java probably needs to change (to keep the parameters separate from 
> the SERVICE endpoint URL).
> See also this thread on jena-users: 
> http://markmail.org/thread/wc5hvr3b3uzy2mrk

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