public String getKeyMarker() {
        return keyMarker;
    }
The key marker parameter originally used to request this version listing,
or <code>null</code> if no key marker was specified. If specified, all object keys
included in this version listing will occur lexically (alphabetically)
after the specified key marker.

@return The key marker parameter originally used to request this version
        listing, or <code>null</code> if no key marker was specified.
aws-java-sdk-s3/src/main/java/com/amazonaws/services/s3/model/VersionListing.java