* source code: rdffederator - Revision 192: /trunk/src
 
   http://code.google.com/p/rdffederator/

* step:

  1.data download:
    
   drugbank:  http://download.bio2rdf.org/release/3/drugbank/  drugbank.nq.gz	19-Dec-2014 13:23	52M
   
   omim:      http://download.bio2rdf.org/release/3/omim/     omim.nq.gz	11-Nov-2014 03:50	124M	 

   pharmgkb:  http://download.bio2rdf.org/release/3/pharmgkb/

 2. ./generate_void.sh ../data/drugbank.nq drugbank_void.n3 

  
{{{
    counting triples and properties
    counting types and entities
    counting distinct objects
    counting distinct subjects
}}}


   
    drugbank: time taken: 91 seconds

    omim: time taken: 411 seconds

3. execute



{{{
20:13:36 [WARN ] [Rio error] Expected ':', found '>' (465, -1) (ParseErrorLogger
.java:28)
20:13:36 [WARN ] [Rio error] Namespace prefix 'LBSL' used but not defined (465,
-1) (ParseErrorLogger.java:28)
20:13:36 [ERROR] [Rio fatal] Not a valid (absolute) URI: null (465, -1) (ParseEr
rorLogger.java:32)
20:13:36 [ERROR] can not parse VOID file file:/opt/services/fsearch/app/splendid
/void/omim.n3: Not a valid (absolute) URI: null [line 465] (VoidStatistics.java:
407)
}}}

check the corresponding void files, and deal with the lines as follows. we simply do the following changes:

void:property fusion> =>  void:property <fusion>