dap4/d4cdm/src/main/java/dap4/cdm/dsp/CDMDSP.java
protected void
    recordSeq(Variable cdm, DapSequence dap)
    {
        cdm = CDMUtil.unwrap(cdm);
        assert this.vlenmap.get(cdm) == null && this.vlenmap.get(dap) == null;
        vlenmap.put(cdm, dap);
    }
protected void
    recordSeq(Variable cdm, DapSequence dap)
    {
        cdm = CDMUtil.unwrap(cdm);
        assert this.vlenmap.get(cdm) == null && this.vlenmap.get(dap) == null;
        vlenmap.put(cdm, dap);
    }
Track Variable <-> DapSequence