rpm 4.15.1

Modules
(un)Installing packages:
Collaboration diagram for (un)Installing packages::

## Modules
| Dependency Set API.
| How to compare dependencies.
| Callback signature & types.
| The signature of function to register as callback and the cases where it can be called.
| Transaction Set API.
| How to create, run & destroy a package transaction.
| Transaction Element API.
| How to retrieve information from a transaction element.
| Problem Set API.
| Problem Set API.
| Problem Element API.
| Problem Element API.
| Verify API.
| How to verify a package.

## Detailed Description