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[thredds] timeCoverage with start, end, and duration

I notice that the THREDDS catalog schema (1.0.2) has maxOccurs="3" for these elements of timeCoverageType. What does it mean when start, end, and duration are all set? 

I'm wondering if it could support the following use case:
I have a dataset that is updated regularly but published one week after the measurement was made. Thus the end of my time coverage is "7 days ago".
I gather that I could define a start time of "7 days ago" by specifying end="present" and duration="7days". But if I also specify a fixed date for the start time, is it in any way acceptable to interpret the duration as an offset from "present"? Any better ideas? 

Thanks,
Doug
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