A. D.'s List: app engine

• The App Engine datastore stores and performs queries over data objects, known as entities. An entity has one or more properties, named values of one of several supported data types. A property can be a reference to another entity.
• A data object in the App Engine datastore is known as an entity. An entity has one or more properties, named values of one of several data types, including integers, floating point values, strings, dates, binary data, and more.
• Each entity also has a key that uniquely identifies the entity.
• Unlike relational databases, the App Engine datastore does not require that all entities of a given kind have the same properties. The application can specify and enforce its data model using libraries included with the SDK, or its own code.

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