Entity reference without given URIs

[kurzum]

raised by rupert:
http://lists.informatik.uni-leipzig.de/pipermail/nlp2rdf/2013-July/000134.html

GIven the same entity is found on different position within the text, we need to designate a property to attach the labels to the entity uri, e.g.

prefix:char=10,15 
   itsrdf:taIdentRef dbpedia:Barack_Obama . 
dbpedia:Barack_Obama 
   my:surfaceForm "Barack Obama" , "President B. Obama" , "Obama"  .

Furthermore, we might need a shortcut property for EntityAnnotations, if such a uri is missing:

prefix:char=10,15 
   itsrdf:annotation urn:etetoiu4942 . 
urn:etetoiu4942 
   a nif:EntityAnnotation ;
   fise:entity-label "Barack Obama" , "President B. Obama" , "Obama"  .

or require to mint a new URI, as is done by open calais

prefix:char=10,15 
   itsrdf:annotation urn:etetoiu4942 . 
urn:etetoiu4942 
   a nif:EntityAnnotation ;
   itsrdf:taIdentRef urn:enitiy-klfödsdokpodfe923230.
urn:enitiy-klfödsdokpodfe923230 
   my:surfaceForm "Barack Obama" , "President B. Obama" , "Obama"  .