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/// @startDocuBlock collectionWithin
/// @brief constructs a within query for a collection
/// `collection.within(latitude, longitude, radius)`
///
/// This will find all documents within a given radius around the coordinate
/// (*latitude*, *longitude*). The returned array is sorted by distance,
/// beginning with the nearest document.
///
/// In order to use the *within* operator, a geo index must be defined for the
/// collection. This index also defines which attribute holds the coordinates
/// for the document.  If you have more then one geo-spatial index, you can use
/// the `geo` operator to select a particular index.
///
///
/// `collection.within(latitude, longitude, radius).distance()`
///
/// This will add an attribute `_distance` to all documents returned, which
/// contains the distance between the given point and the document in meters.
///
/// `collection.within(latitude, longitude, radius).distance(name)`
///
/// This will add an attribute *name* to all documents returned, which
/// contains the distance between the given point and the document in meters.
///
/// Note: the *within* simple query function is **deprecated** as of ArangoDB 2.6. 
/// The function may be removed in future versions of ArangoDB. The preferred
/// way for retrieving documents from a collection using the within operator  is
/// to use the AQL *WITHIN* function in an [AQL query](../Aql/GeoFunctions.md) as follows: 
///
///     FOR doc IN WITHIN(@@collection, @latitude, @longitude, @radius, @distanceAttributeName)
///       RETURN doc
///
/// @EXAMPLES
///
/// To find all documents within a radius of 2000 km use:
///
/// @EXAMPLE_ARANGOSH_OUTPUT{009_collectionWithin}
/// ~ db._create("geo");
/// ~ db.geo.ensureIndex({ type: "geo", fields: [ "loc" ] });
/// |~ for (var i = -90;  i <= 90;  i += 10) {
/// |  for (var j = -180; j <= 180; j += 10) {
///       db.geo.save({ name : "Name/" + i + "/" + j, loc: [ i, j ] }); } }
///   db.geo.within(0, 0, 2000 * 1000).distance().toArray();
/// ~ db._drop("geo");
/// @END_EXAMPLE_ARANGOSH_OUTPUT
///
/// @endDocuBlock
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