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= Person Entity Model =

The Person Entity Model defines a framework for the modelling of person-related entities like organisations, teams and other groups - and of course persons. It includes a generic model for affiliation, which shall be introduced here.

== Introduction ==

We start with an obviously simple (read: small) set of person entities:

[[Image(pe_hierarchy1.png)]]

Each of these entities can define a number of roles which affiliated entities can have:

[[Image(pe_hierarchy2.png)]]

Now we link the respective entities to the roles, which defines an already pretty complex relationship network:

[[Image(pe_hierarchy3.png)]]

Some of these relationships define a hierarchy, while others don't:

[[Image(pe_hierarchy4.png)]]

This hierarchy defines ancestor paths among the person entities:

[[Image(pe_hierarchy5.png)]]

If we remove the roles, this becomes more obvious:

[[Image(pe_hierarchy6.png)]]

Now we can make the actual "hierarchy" visible by moving each entity to a certain "hierarchy level":

[[Image(pe_hierarchy7.png)]]

As you can see, "Person Y" belongs to two different organisations here - with two different ancestor paths.

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