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added entity Transaction, Package and Pkg Instance and some important

relationships

add Business_Entity as an entity in the ER diagram

changed data model picture from UML to ER diagram

added cardinality edges to diagram

flushed out main entity types for financial accounting system

This is a method of using dia to diagram the data model. Dia can produce

.png format files on the command line, so I wrote a makefile which produces

datamodel.png from datamodel.dia and also contains a pattern rule to

produce any.png from any.dia.

Requirements for running the make:

- gnu make

- dia

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