BAND question

[Alberto Micol]

Hi Doug,

I was trying to understand how I should
implement the search engine using the BAND parameter.

Suppose that the query says BAND := 5E-7/5.5E-7

I do have datasets in my archive with a bandpass extending from  
4.8E-7 to 5.1E-7
and others with a bandpass going from 5.1E-7 to 5.4E-7.

The first set of datasets hence have a bandpass that intersects the  
required one,
while the second set has a bandpass that is fully immersed into the  
required BAND.

Which ones should I return? Both or only the second set?
That is, does intersection suffice?

Or instead should simply be the typical wavelength (central  
wavelength however defined)
that should match the constraint? (in which case some datasets of my  
first set might
match and others might not if their central wavelength is defined  
differently)

So, shall the data provider work with BOUNDS or LOCATIONs (in char  
speak) to answer
a BAND query?

Whatever the answer, it would be useful to describe this in the  
document,
so that we get consistent results from different data centres.

Thanks,

Alberto