The Napkin Representation

[Roy Williams]

Alasdair

I have tried to produce a more formal version of the napkin 
representation, using the data and metadata from Solano's example light 
curve. (see attached file napkin.xml)

The parameters have an attribute "utype" which refers back the precise 
meaning defined in the spectrum DM, for example the start time for the 
light curve has the utype = sed:Segment.Coverage.Region.Time.Start.

I have put four quantities in each row, as you had, bus slightly 
different naming. My version has each measurement with four pieces:
    <Time unit="day">1305.65557</Time>
    <TimeExtent unit="s">30.00002</TimeExtent>
    <Flux unit="mag">7.808</Flux>
    <FluxErr unit="mag">0.012212</FluxErr>

How does this look?
Roy

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