Defines navigations (query transformations).

## Overview

The navigations (transformations of the underlying query) are broken into several interfaces, approx. one per use case. Navigations are optional extensions of the core OlapModel.

## Calculated Members

Calculated Members are created from Templates. A template describes a predefined formula for calculated members. The formula may contain parameters that have to be replaced with concrete values when a CalcMember member is created from the template.

Example: a template defines the formula `100 * (A - B) / A` where `A` and `B` are parameters of type `Measure`. To create a concrete CalcMember the parameters of the template will be replaced by the values the user specified, for example `100 * ([Measures].[Revenue] - [Measures].[Cost]) / [Measures].[Revenue]`.

@see com.tonbeller.jpivot.olap.model.OlapModel @see com.tonbeller.jpivot.core.Model @see com.tonbeller.jpivot.core.Extension