TITLE:     Domain Specific Patterns: Conversions, Persons and Roles, and
           Documents and Roles.

AUTHOR:    Ari Schoenfeld

CONTACT:   Ari

E-MAIL:    ari@servidor.unam.mx

ADDRESS:   Dakota No. 57-7 
           Col. Napoles
           C.P. 03810
           Mexico D.F.
           MEXICO

PHONE:     (525) 682 9176
FAX:       (525) 523 1198

ABSTRACT:

This paper exposes a proposal of three domain specific patterns. These 
patterns deal with abstractions from the real world that are likely to 
appear mainly in business and administration software systems, so that 
solutions to some typical problems in this kind of systems can be found. 
The first one is the Conversions pattern, useful for handling uniformly 
anything that can be converted from one scale to another. The second one, 
Persons and Roles, is presented as a basis for the Documents and Roles 
pattern, which is the third one. The Documents and Roles pattern gives a 
general basis for any administrative system.