My goal is to allow a user to specify a filter a la json. And then use the 
filter on incoming json documents. I'm pretty much looking for an 
implementation similar to mongodb's query command.  Maybe theres something 
better than the mongo way, I dont know.  I just want filters defined in 
json.

For example here is a doc

doc: {
  "num": 1234,
  "name": "foobar"
}

and here is the query:

query: {"$and": [{"name": "foobar"}, {"num": {"$lt": 2000}}]} 

Based on this query, my doc will pass the filter.

Thanks for any help on pointing me in the right direction!

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