> I don't understand why. In my example it wouldn't. The count functions could
> count
> the number of empty objects or objects that contain only the STREET field.

I've looked into the test and here are the issues:
1) The fn:count() does not have the %explores-json annotation. I've confused it 
with the JSONiq array size() function.

2) Currently the dataguide does not distinguish between any of the fn: 
functions. So for example if you modify the query:

    for $obj in parse-json(f:read-text(fn:resolve-uri("citylots-small.json")))
    group by $s := $obj.STREET
    return {
      street : $s,
      count : count($obj),
      seq : subsequence($obj, 1, 100)

then if you prune the input to have only the .STREET field you'll get an 
incorrect result. So currently the argument to subsequence() is "explored" and 
so the dataguide is "*" in this case. The same happens with count(). 

3) fn:count() is a special case as it only cares for the number of objects and 
not their contents. I think another annotation could be added, which would be 
the opposite of %explores-json and which would indicate that the function 
ignores the details of the object. Or I could just add some code in the 
dataguide collection to handle fn:count() separately. 


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