Causes keys that contain the same string between the prefix and the first
occurrence of the delimiter to be rolled up into a single result element in
the CommonPrefixes collection. These rolled-up keys are not
returned elsewhere in the response. Each rolled-up result counts as only one
return against the MaxKeys value.
When response is truncated (the IsTruncated element value in the response is
true), you can use the key name in this field as marker in the subsequent
request to get next set of objects. Amazon S3 lists objects in alphabetical
order Note: This element is returned only if you have delimiter request
parameter specified. If response does not include the NextMarker and it is
truncated, you can use the value of the last Key in the response as the
marker in the subsequent request to get the next set of object keys.