public URI createURI(String uriString) throws ModelRuntimeException {
// check if Sesame accepts this URI
try {
this.valueFactory.createURI(uriString);
} catch(IllegalArgumentException e) {
throw new ModelRuntimeException("Wrong URI format for Sesame", e);
}
// return an URI if no error occured
return new URIImpl(uriString, false);
}