- Archive description
  = Name (observatory, telescope, instrument, ...)
  = Archive location
    * Physical
    * URL
  = Coverage
    * Time
      . Time range
      . Time resolution
    * Location
  = Spectral properties
  = Observables
    * Magnetogram
    * Doppler
    * Intensity
  = Operation status
  = Contact person

         
- Access interface
  = Retrievable
    * Observation
    * Proposal
  = Searchables (in)
    * Instrument
    * Spectral properties
    * Observables
    * Coverage
  = Query result format (out)
    * XML
    * HTML
  = Availability
    * Off-line
    * On-line
  = Export methods
    * URL
    * CD-ROM
    * Disk copy
    * ...

This organizational schema focuses on two items: What it is (archive
description) and how to use it (access interface).