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https://issues.apache.org/jira/browse/JENA-508?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15386550#comment-15386550
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Alessandro Seganti commented on JENA-508:
-----------------------------------------

Andy,
I was studying how we can implement the missing functions (format-date/time). 
The main problem with these is:
* the convention required in XPath3 is not the same as the one used in the 
DatetimeFormatter in java
* the DateTimeFormatter has a lot less options than the one required by Xpath3

thus in my opinion the work involved to fully implement these functions could 
be quite big and I am not sure that it is worth :)

Regards,
Alessandro

> Add support for XPath 3 Functions
> ---------------------------------
>
>                 Key: JENA-508
>                 URL: https://issues.apache.org/jira/browse/JENA-508
>             Project: Apache Jena
>          Issue Type: Improvement
>          Components: ARQ
>            Reporter: Rob Vesse
>            Assignee: Andy Seaborne
>             Fix For: Jena 3.1.1
>
>
> XPath 3 is now a Candidate Recommendation - 
> http://www.w3.org/TR/xpath-functions-30/
> It contains many new functions and operators (particularly in the 
> mathematical space) which we should consider adding into future versions of 
> ARQ.



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