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https://issues.apache.org/jira/browse/JENA-507?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13735123#comment-13735123
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Rob Vesse commented on JENA-507:
--------------------------------

Yes, that is why I mentioned the XPath 3 functions since those now include many 
of these functions so that would seem like an appropriate standard namespace to 
use as far as possible

Supporting the Stardog namespace for relevant functions is also another option 
to boost portability (both for ARQ and dotNetRDF)
                
> Add support for Leviathan extension functions to ARQ
> ----------------------------------------------------
>
>                 Key: JENA-507
>                 URL: https://issues.apache.org/jira/browse/JENA-507
>             Project: Apache Jena
>          Issue Type: Improvement
>          Components: ARQ
>            Reporter: Rob Vesse
>            Assignee: Rob Vesse
>              Labels: extension, functions, sparql
>   Original Estimate: 336h
>          Time Spent: 4h
>  Remaining Estimate: 332h
>
> The Leviathan Function library is a set of extension functions present in 
> dotNetRDF's SPARQL engine.  It contains a useful set of numeric functions 
> which would be useful to have available in core ARQ and would boost 
> portability of queries between ARQ and dotNetRDF (note that dotNetRDF already 
> supports ARQs extension functions).
> See 
> https://bitbucket.org/dotnetrdf/dotnetrdf/wiki/DeveloperGuide/SPARQL/Leviathan%20Functions
>  for definition of functions
> Note that some of these overlap with new XPath 3 functions but for 
> portability purposes there is no reason not to support these as well since 
> most are relatively trivial to implement.  I will file a separate issue for 
> supporting XPath 3 functions.

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