range_queries_attribute_sets

Method One: Array of Objects
------
var pd = { type: "Person", attributes: [{name: "Penelope Doe"},{age: 26}] };
var pd2 = { type: "Person", attributes: [ {name: "Johnny Doe"},{age: 27} ] };
db.foo.drop();
db.foo.save(pd);
db.foo.save(pd2);
db.foo.ensureIndex({attributes:1})
db.foo.find({'attributes' : {age : {$gt : 26 } } }).count()
db.foo.find({'attributes' : {age : {$gt : 26 } } }).explain()
{
        "cursor" : "BtreeCursor attributes_1",
        "nscanned" : 0,
        "nscannedObjects" : 0,
        "n" : 0,
        "millis" : 1,
        "indexBounds" : {
                "attributes" : [
                        [
                                {
                                        "age" : {
                                                "$gt" : 26
                                        }
                                },
                                {
                                        "age" : {
                                                "$gt" : 26
                                        }
                                }
                        ]
                ]
        }
}

Method 2: Object
------
var pd = { type: "Person", attributes: {  name: "Penelope Doe", age: 26  } };
var pd2 = { type: "Person", attributes: {  name: "Johnny Doe", age: 27 } };
db.foo.drop();
db.foo.save(pd);
db.foo.save(pd2);
db.foo.ensureIndex({attributes:1})
db.foo.find({'attributes' : {age : {$gt : 26 } } }).count()
db.foo.find({'attributes' : {age : {$gt : 26 } } }).explain()
{
        "cursor" : "BtreeCursor attributes_1",
        "nscanned" : 0,
        "nscannedObjects" : 0,
        "n" : 0,
        "millis" : 1,
        "indexBounds" : {
                "attributes" : [
                        [
                                {
                                        "age" : {
                                                "$gt" : 26
                                        }
                                },
                                {
                                        "age" : {
                                                "$gt" : 26
                                        }
                                }
                        ]
                ]
        }
}