nsIRDFResource* elbow = ass->mProperty;
nsIRDFResource* elbow = ass->u.as.mProperty;
InMemoryDataSource::HasArcOut(nsIRDFResource *aSource, nsIRDFResource *aArc, PRBool *result){    NS_AUTOLOCK(mDataSource->mLock);    Assertion* ass = GetForwardArcs(aSource);    while (ass) {        nsIRDFResource* elbow = ass->mProperty;        if (elbow == aArc) {            *result = PR_TRUE;            return NS_OK;        }        ass = ass->mNext;    }    *result = PR_FALSE;    return NS_OK;}