<commit_before>/**
 * This is an interface that can be implemented to provide a persistence
 * engine for an Ember-Graph application. The engine doesn't have to
 * know anything about Ember-Graph or relationships in order to function,
 * it just needs to be able to store and retrieve records and relationships
 * by type and ID. If you can implement the basic storage functionality,
 * {{link-to-class 'EmberGraphDatabaseAdapter'}} will take care of ensuring
 * relationship integrity. Two good use cases are in memory and local
 * storage persistence. (Both of which come with Ember-Graph in the
 * {{link-to-class 'MemoryAdapter'}} and
 * {{link-to-class 'LocalStorageAdapter}}).
 *
 * There are two JSON data types that the persistence engine must store and
 * retrieve: records and relationships. Records holds attributes and
 * relationships hold data describing which records it links to. Examples
 * of both can be found below.
 *
 * Record:<commit_msg>Fixed bug in documentation.<commit_after>/**
 * This is an interface that can be implemented to provide a persistence
 * engine for an Ember-Graph application. The engine doesn't have to
 * know anything about Ember-Graph or relationships in order to function,
 * it just needs to be able to store and retrieve records and relationships
 * by type and ID. If you can implement the basic storage functionality,
 * {{link-to-class 'EmberGraphDatabaseAdapter'}} will take care of ensuring
 * relationship integrity. Two good use cases are in memory and local
 * storage persistence. (Both of which come with Ember-Graph in the
 * {{link-to-class 'MemoryAdapter'}} and
 * {{link-to-class 'LocalStorageAdapter'}}).
 *
 * There are two JSON data types that the persistence engine must store and
 * retrieve: records and relationships. Records holds attributes and
 * relationships hold data describing which records it links to. Examples
 * of both can be found below.
 *
 * Record:
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