code: function _gpfDefineEntitiesAdd (entityDefinition) {
      _gpfAssert(entityDefinition._instanceBuilder !== null, "Instance builder must be set");
      _gpfAssert(!_gpfDefineEntitiesFindByConstructor(entityDefinition.getInstanceBuilder()), "Already added");
      _gpfDefinedEntities.push(entityDefinition);
  }
docs: Store the entity definition to be retreived later
  
  @param  {_GpfEntityDefinition} entityDefinition Entity definition
  @since 0.2.9