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