Categories

Some attributes have only a given set of values; we call them enumerations. An example is the Operating System of a notebook: Linux, MaxOS, WinXP, ...

Others have a hierarchical presentation, like the organisational units of a university: faculty/department

Categories cover both cases.

Switching the root categories

If you change a root category, rapla tries to migrate the categories. It looks for the same keys. So before switching the root category try to change the key names so rapla can find the same category in the new tree.

The following changes are supported:

root changes from b to c, when c contains the b substructure including b

a
/ \
|b| |c|
/   /
d   b
/
d

root changes from b to c when c contains directly the b substructure but not b itself

a
/ \
|b| |c|
/   /
d   d