I have two entity kinds and one referring to other like:

```
class Entity1(db.Expando):
     prop1=db.StringProperty()
     prop2=db.StringProperty()

class Entity2(db.Expando):
     prop3=db.ReferenceProperty(Entity1)
     prop4=db.StringProperty()

```

Can I write a query like:

```
q=Entity2.all().filter("prop3.prop1 =",somevalue)

```

Here prop3 has a reference and will be referring to some entity of kind Entity1 and I want to know all those entities of kind Entity2 which refer to those entities of Entity1 that have prop1 as somevalue.