@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix rgml: <http://purl.org/puninj/2001/05/rgml-schema#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
@prefix : <simple_graph#> .

:g1 a rgml:Graph; 
    rgml:directed "true";
    rgml:nodes :n1;
    rgml:nodes :n2;
    rgml:nodes :n3;
    rgml:edges :e1;
    rgml:edges :e2 .

:n1 a rgml:Node .
:n2 a rgml:Node .
:n3 a rgml:Node .

:e1 a rgml:Edge ;
    rgml:source :n1;
    rgml:target :n2 .

:e2 a rgml:Edge ;
    rgml:source :n1;
    rgml:target :n3 .

#ends