Describing things for software to read

[Matthew Graham]

Or you might want to query on all filters that have greater than 90%
transmission over some subrange of their total wavelength coverage, e.g.
combining broad band and narrow band filter data for photometric redshifts
so you effectively use a subsection of the broad band filter as a narrow
band. Where does this information get stored? Or is it a two-stage
process:
	1. Get all filter types
	2. Determine which filter types have a region of width 300A where
the transmission is greater than 90% (how do you do this when just start
and end wavelengths are given?)
	3. Return the fluxes/magnitudes within those filters

	Cheers,

	Matthew