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A valid ISRaD database is a list with the following elements, all of which must be data.frame objects:
data.frame
metadata Metadata
metadata
site Site data
site
profile Profile data
profile
flux Flux data
flux
layer Layer data
layer
interstitial Interstitial data
interstitial
fraction Fraction data
fraction
incubation Incubation data
incubation
is_israd_database(x)
TRUE or FALSE.
The object to check