**CheD is universal due to variety of datafield types**

**Obligatory types of fields: **

1.* Structure - *connectivity matrix and atomic screen coordinates, which
are created by implanted original structure editor **StrEd**

2. *Brutto-formula - *calculated automatically from the structure

3. *Molecular weight - *calculated automatically from the structure.

**Arbitrary types of fields: **

4. *Chemical structure - *additional structure type field

5.* Real*

6. *Real + units - *real numbers with a measure units

7. *Integer*

8. *String*

9. *List*

10. *Text*

11. *Boolean*

12. *Calculated - *the value is calculated from the mathematical formula

13. *Function - *calculated using mathematical formula, presented as diagram

14. *Picture -* graphical image

15. *Object* - standard Windows OLE type

16. *Date *

17.* Record - *the group of fields mentioned

18. *Packed Array - *two dimensional array to store spectral information

19. *WWWLink* - calls defined URL

20.* DataBase Link* - calls addressed CheD database open on defined record.