m = function(){
    /**
     * @description Mapper
     * @return 
     **/
    if( this._attributes ){
	emit(
	    this._attributes.entityid, 
	    {
	    'entity': this,
	    'deltas':[]
	    }
	    );
    } else if( this.RelatedEntityId )
    {
	emit( this.RelatedEntityId, 
	      {
		  'entity': undefined,
		  'deltas': [this]
	      }
	    );
    }
};


r = function(key, values){
    /**
     * @description Reducer function
     * @param key
     * @param values Values associated with the given key
     * @return map containing up to 3 fields: deltas with a list of deltas, entity with the entity, key which contains the key
     **/

    var reducedPackage = { 'deltas' : [], 
			   'entity' : undefined };
    for( indexValue in values ){
	currentValue = values[indexValue];
	if( currentValue.entity ){
	    reducedPackage.entity = currentValue.entity;
	}
	reducedPackage.deltas = reducedPackage.deltas.concat( currentValue.deltas );
    }
    return reducedPackage;
};