Finding a SPARQL endpoint by an LOD URI?

Hi all,

I am wondering whether there is a way of finding a SPARQL endpoint for 
an LOD URI, i.e., a function f that behaves like
f(<http://dbpedia.org/resource/Darmstadt>) = <http://dbpedia.org/sparql>

TimBL's design issues document [1] says:
"To make the data be effectively linked, someone who only has the URI of 
something must be able to find their way the SPARQL endpoint.  [...] 
Vocabularies for doing this have not yet been standardized."

Is that still the state of affairs? Are there any practical workarounds?

Best,
Heiko

[1] http://www.w3.org/DesignIssues/LinkedData.html

-- 
Dr. Heiko Paulheim
Knowledge Engineering Group
Technische Universität Darmstadt
Phone: +49 6151 16 6634
Fax:   +49 6151 16 5482
http://www.ke.tu-darmstadt.de/staff/heiko-paulheim