Sparql Function Description

Hi all

at the moment I am implementing some SPARQL functions and want to describe in a structured way. I have seen that in SPARQL 1.1. Service description there is a possibility to link to functions, but no further properties (input, output, etc) are defined.
Are there any efforts to extend sd:Function to this. Or what do you think is the best approach. As far as I know, there us no real standard for this, even there are attempts like [1] or [2] (but they seem to be outdated?).

I am looking forward to your response, thanks in advance!

Best regards
Thomas

[1] http://www.spinrdf.org/spin.html#spin-functions
[2] http://www.ldodds.com/schemas/sparql-extension-description/

--
Thomas Kurz
Forschung & Entwicklung / KMT

Salzburg Research Forschungsgesellschaft mbH 
Jakob-Haringer-Straße 5/3 | 5020 Salzburg, Austria 
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thomas.kurz@salzburgresearch.at 
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