dap4/d4core/src/main/java/dap4/core/ce/Universal.java
@Override
    public boolean references(DapNode node)
    {
        switch (node.getSort()) {
        case DIMENSION:
        case ENUMERATION:
        case VARIABLE:
        case GROUP:
        case DATASET:
            return true;
        default:
            break;
        }
        return false;
    }
@Override
    public boolean references(DapNode node)
    {
        switch (node.getSort()) {
        case DIMENSION:
        case ENUMERATION:
        case VARIABLE:
        case GROUP:
        case DATASET:
            return true;
        default:
            break;
        }
        return false;
    }
Selected consult or iterator overrides for efficiency