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https://issues.apache.org/jira/browse/JENA-691?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13993504#comment-13993504
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Andy Seaborne commented on JENA-691:
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Possible categories:
* queries (not for Fuseki logging - that is better done with Fuseki's logs
which include code for an NCSA format log output)
* algebra from query, before and after algebra optimization
* execution of algebra
** Some degree of extensibility for new engines to add their own categories
* Remote requests
** Direct remote call from the application e.g.
`QueryExecutionFactory.sparqlService`
** From within a query e.g. `SERVICE`
> "Explain" Categories
> --------------------
>
> Key: JENA-691
> URL: https://issues.apache.org/jira/browse/JENA-691
> Project: Apache Jena
> Issue Type: Improvement
> Reporter: Andy Seaborne
>
> "Explain" capabilities in ARQ are provided like logging levels with levels
> ALL, INFO, FINE and NONE. For example, Algebra is printed at level FINE but
> that implies level INFO, which includes queries.
> Instead, categories would be better so that a "mix and match" of various
> explanations could be set to give a more focused output.
> This JIRA is for collecting suggestions, requests and contributions for a
> more extensive "Explain" capability.
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