[redland-dev] librdf_model_get_arcs_out assertion failure

[David Nickerson]

Hi all,

I am using the librdf_model_get_arcs_out method (from C code) to iterate 
through all the arcs out of a given node in an RDF model. Whenever I 
call this method I get the following printed to stderr

rdf_node.c:677: (librdf_new_node_from_node) assertion failed: object 
pointer of type librdf_node is NULL.

I get this for both the Redland 1.0.5 I built myself and the FC5 binary 
packages (redland 1.0.5-1, rasqal 0.9.13-1, and raptor 1.4.13-1) from 
http://download.librdf.org/binaries/redhat/fc5/. I'm also getting the 
same behaviour when using rdfproc with the arcs-out command.

Despite the assertion failure everything seems to work fine and I'm 
getting all the results (arcs) I expect from a given node - again in 
both my code and by using rdfproc.

Has anyone else seen this behaviour? or have I missed something obvious? 
I'm new to redland (and RDF in general) and some pointers to where to 
start looking would be much appreciated.

Thanks,
David.


-- 
David Nickerson, PhD
Research Fellow
Division of Bioengineering
Faculty of Engineering
National University of Singapore
Email: david.nickerson at nus.edu.sg