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Overpass API: settings

Overpass settings set optional global variables.
These settings need to be set as first statement of an Overpass API query.
Settings declarations are enclosed in brackets []. A colon (:) separates the setting name from its value.
The settings section is terminated with a semicolon (;). Multiple settings are not separated by anythin.
The setting statement (as all other statements) must be terminated with a semicolon (;).
Settings include:
bbox
out Specifies the format of the returned data. The out setting is unrelated to the out statement.
timeout Duration in seconds after which a query is terminated?
date
diff
adiff
maxsize The maximum size of memory (bytes?) allowed to process the query by the server.

Multiple settings

Multiple settings are not separated by anything.
The following example specifies an out and a bbox setting: 
[out  : csv(::id, "name", "name:de";false; '|')]
[bbox : {{bbox}}                               ];

nw [amenity=restaurant];

out;

date

[date:"2015-10-28T19:20:00Z"]
  …

diff

[diff:"2012-09-14T15:00:00Z"]

[diff:
  "2012-09-14T15:00:00Z",
  "2012-09-21T15:00:00Z"
]

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