checkVertex(vFrom);
        checkVertex(vTo);

        checkVertices();

        checkEdge(e);
        checkEdges();

        e.setSource(vFrom);
        e.setTarget(vTo);

        vFrom.setCompareVersion(versionedVertices);
        vFrom.setCompareScope(scopedVertices);

        List<MetadataGraphEdge> exList = excidentEdges.computeIfAbsent(vFrom, k -> new ArrayList<>());