Examples

Repository of examples

Object/relational mapping

The object-relational mapping is a classical example on bidirectional transformations, that maps class diagrams to relational database schemes.

• Simplified version
• Version with associations and keys

Expand/collapse state diagrams

This example relates hierarchical state machines with non-hierarchical state machines, by the expansion/collapsing of the diagrams.

• Recursive version
• Version with closure

Feature model/configuration selection

This multidirectional example relates multiple configuration models with a feature model that defines valid configuration.

• Basic multidirectional version

Multiplicity taxonomy

This is a series of toy transformations designed to test the expressibility of Echo, inspired by the taxonomy for binary relations from the Data Transformation by Calculation tutorial by J. N. Oliveira.

set-to-set (relation) set-to-lone (simple) set-to-some (entire) set-to-one (function) lone-to-set (injective) lone-to-lone (simple and injective) lone-to-some (representation) lone-to-one (injection) some-to-set (surjective) some-to-lone (abstraction) some2some (surjective and entire) some2one (surjection) one-to-set (injective and surjective) one-to-lone (injective abstraction) one2some (surjective representation) one2one (bijection)