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https://issues.apache.org/jira/browse/JENA-632?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16407706#comment-16407706
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ASF GitHub Bot commented on JENA-632:
-------------------------------------

Github user afs commented on a diff in the pull request:

    https://github.com/apache/jena/pull/114#discussion_r176029548
  
    --- Diff: jena-arq/Grammar/master.jj ---
    @@ -2176,6 +2251,19 @@ String String() : { Token t ; String lex ; }
         }
     }
     
    +#ifdef ARQ
    +Number Number() : { Token t ; Number number ; }
    +{
    +  (
    +    t = < INTEGER > { number = integerValue(t.image) ; }
    +  | t = < DECIMAL > { number = doubleValue(t.image) ; }
    --- End diff --
    
    Would this be simpler? 
    
    Generate `Node` from the parser, 
    The data  structure is then `Map<String, Node> jsonMapping`.
    To use, lookup variables in the binding to get a `Node` and also use the 
`Node`s from `jsonMapping`.
    
    In the grammar, use `NumericLiteral() | BooleanLiteral()`, which return 
`Node`, then the sign of numbers is also handled.  as well as booleans. When 
needing the item for making the JSON, apply `RDFTerm2Json`, as is done when a 
variable is used and turned into a Json value.
    
    There isn't a standard alone string rule returning a `Node`. The `String()` 
returns a string (it is used to make a RDF Literal, optional ^^ and @ parts) - 
to unify handling turn the string into a `Node` with 
`NodeFactory.createLiteral(t.image)`.



> Generate JSON from SPARQL directly.
> -----------------------------------
>
>                 Key: JENA-632
>                 URL: https://issues.apache.org/jira/browse/JENA-632
>             Project: Apache Jena
>          Issue Type: Improvement
>          Components: ARQ, Fuseki
>            Reporter: Andy Seaborne
>            Assignee: Bruno P. Kinoshita
>            Priority: Minor
>              Labels: java, javacc
>          Time Spent: 0.5h
>  Remaining Estimate: 0h
>
> The capability to generate JSON directly from a SPARQL (or extended SPARQL) 
> query would enable the creation of JSON data API over published linked data.
> This project would cover:
> # Design and publication of a design.
> # Refinement of design based on community feed
> # Implementation, including testing.
> # Refinement of implementation based on community feed
> Skills required: Java, some parser work, design and discussion with the user 
> community, basic understanding of HTTP and content negotiation.



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