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- Redirect
- If there's only one sub-map engine, then any request to the map engine will be sent directly to the sub-map engine.
- Fail-over
- If "failover" is set to true for the map engine, then the first sub-map engine listed will be used until it fails, then the second sub-map engine will be used instead.
- Alternating styles
- If "altlayers" setting is set by providing a list of layer id's, when none of those layers are requested, the first sub-map engine will be used, but if any of those layers are requested then the second sub-map engine will be used.
- Load balancing
- If there is more than one sub-map engine listed and "failover" and "altlayers" are not set then incoming requests will be spread across the listed sub-map engines.
- Stitching
- If there is only one sub-map engine and "maxwidth" and "maxheight" are set, then any request for a map over that size will be broken up into multiple requests to ensure the underlying map engine will generate the requested image size.
- If there is only one sub-map engine and "maxwidth" and "maxheight" are set, then any request for a map over that size will be broken up into multiple requests to ensure the underlying map engine will generate the requested image size.
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