The database is arranged as a hierarchy. For example, the value of a Level-3 equipment category is equal to the sum of its Level-4 subcategories.  A category's level can be determined by the number of non-zero digits.  For example COMPUTER + MINIMUM MEMORY (541000) is a Level-3 category.

5-4-0-0-0-0 COMPUTER                                           

5-4-1-0-0-0 CPU+MIN MEMORY                                 

5-4-1-1-0-0 SINGLE USER SYSTEMS                         

5-4-1-2-0-0 HOST COMPUTERS              

5-4-1-3-0-0 OTHER COMPUTERS

5-4-2-0-0-0 STORAGE PRODUCTS

                    DISK SYSTEMS & ARRAYS

                    DISK DRIVES

                    STORAGE AREA NETWORKS

                    TAPE DRIVES

                    OTHER STORAGE

5-4-2-2-0-0 STORAGE PARTS & ATTACHMENTS

5-4-2-1-0-0 ADD-IN MEMORY

5-4-2-4-0-0 STORAGE MEDIA

5-4-3-0-0-0 PERIPHERALS

                    INPUT DEVICES

                    OPTICAL BAR CODE

                    OPTICAL OCR                    

                    OPTICAL SCANNERS

                    MAGNETIC STRIP & INK

                    IMPACT PRINTERS

                    NONIMPACT PRINTERS

                    MONITORS - FLAT PANEL

                    MONITORS - OTHER

                    ACCESSORIES

                    OTHER PERIPHERALS

                    PARTS & ASSEMBLIES

5-4-5-0-0-0 TERMINALS

5-4-9-0-0-0 OTHER COMPUTER EQUIPMENT

                    PROCESSOR BOARDS

                    OTHER EQUIPMENT

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