[Gramps-devel] Gramps data domain model

[Eero T. <ee...@us...>]

Hi,

I tried to do a domain model of the Gramps data i.e. list all the separate 
data entities and their relations.

Entities are separate if:
- Another entity can relate to multiple items
- Multiple entities can relate to exactly same item
- The items are not predetermined (e.g. gender) and
  contain multiple properties (address contains street, city etc)
- Different things are done for them (e.g. address and
  internet address are usually output differently)

The attached model tries to contain all entities and their
relations in Gramps:
- Person
- Name (person can have multiple names and they can
  change, name change is an event)
- Relationship (person can have multiple relationship and
  relationships are at least legally associated to events such
  as birth, marriage etc.)
- Event
- Place (events happen in some place)
- Address (person can have multiple addresses and multiple
  persons can live in the same address)
- Internet address (both places and persons can have
  multiple internet addresses, at least over time)
- Attribute (persons can have any number of attributes)
- Media (except for relationships and attributes, things
  can have pictures etc.)
- Source (every bit of information can have several sources)

Does the model look about right?

Questions:
- Why events have places and persons addresses i.e. separate entities?  
  Both places and addresses have about the same properties.
- Gender might actually be a separate entity too as nowadays people
  can change it...


	- Eero

(Domain diagram is the first step before class and database diagrams. :-))