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Structural/DataMapper/README.md

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-# Data Mapper
-
-## Purpose
-
-A Data Mapper, is a Data Access Layer that performs bidirectional transfer of
-data between a persistent data store (often a relational database) and an in
-memory data representation (the domain layer). The goal of the pattern is to
-keep the in memory representation and the persistent data store independent of
-each other and the data mapper itself. The layer is composed of one or more
-mappers (or Data Access Objects), performing the data transfer. Mapper
-implementations vary in scope. Generic mappers will handle many different domain
-entity types, dedicated mappers will handle one or a few.
-
-The key point of this pattern is, unlike Active Record pattern, the data model follows Single Responsibility Principle.
-
-## Examples
-
-* DB Object Relational Mapper (ORM) : Doctrine2 uses DAO named as "EntityRepository"
-
-## UML Diagram
-
-![Alt DataMapper UML Diagram](uml/uml.png)