[jira] [Commented] (JENA-989) Round tripping property paths from SPARQL into Sexpressions and back yields a syntax error

["Andy Seaborne (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/JENA-989?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14626025#comment-14626025 ] 

Andy Seaborne commented on JENA-989:
------------------------------------

This is a problem caused by JENA-972 (Improve the printing of basic graph patterns) but OpAsQuery tends to create queries that are likely to trigger this.

OpAsQuery tends to create group elements (between {{\{...\}}}) with adjacent {{ElementPathBlocks}} - blocks for any basic graph pattern and blocks for each path. {{ElementPathBlocks}} can hold both and the parser will not produce adjacent blocks, but instead a single combined block.  Both wend up as the same algebra.

JENA-972 improved the prettiness of output but has a bug whereby "no triple patterns before the path" causes the stray {{.}}.  OpAsQuery is not necessary. to cause this.

> Round tripping property paths from SPARQL into Sexpressions and back yields a syntax error
> ------------------------------------------------------------------------------------------
>
>                 Key: JENA-989
>                 URL: https://issues.apache.org/jira/browse/JENA-989
>             Project: Apache Jena
>          Issue Type: Bug
>          Components: ARQ
>    Affects Versions: Jena 3.0.0
>            Reporter: Rick Moynihan
>
> The following SPARQL query:
> {noformat}
> SELECT ?uri WHERE {
>   ?uri <http://www.w3.org/2000/01/rdf-schema#subPropertyOf>+ <http://purl.org/linked-data/sdmx/2009/dimension#refArea>
> }
> {noformat}
> When converted into an sse:
> {noformat}
> (path
>   ?uri
>   (path+ <http://www.w3.org/2000/01/rdf-schema#subPropertyOf>)
>   <http://purl.org/linked-data/sdmx/2009/dimension#refArea>)
> {noformat}
> and converted back into a SPARQL query via OpAsQuery is syntactically invalid.  Note the misplaced `.`:
> {noformat}
> SELECT  *
> WHERE
>   {  .
>     ?uri (<http://www.w3.org/2000/01/rdf-schema#subPropertyOf>)+ <http://purl.org/linked-data/sdmx/2009/dimension#refArea>
>   }
> {noformat}
> The same seems to occur for all other property paths (e.g. those that use +, *, /, ^ etc...) 
> This seems related to issues resolved in JENA-963.



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