Enums.KmlRefreshMode enumeration

Defines the time-based refresh behavior of a KmlNetworkLink.

KmlRefreshMode can be one of:

Constant	Description
`Enums.KmlRefreshModeOnChange`	`(0)` Refresh when the file is loaded and whenever the `Link` parameters change.
`Enums.KmlRefreshModeOnExpire`	`(2)` Refresh every `n` milliseconds. Note, if `refreshInterval` is `0` when the mode is set to `Enums.KmlRefreshModeOnInterval`, it will automatically update the `refreshInterval` to 4000 milliseconds.
`Enums.KmlRefreshModeOnInterval`	`(1)` Refresh the file when the expiration time is reached. If a fetched file has a KmlNetworkLink, the `expires` time takes precedence over expiration times specified in HTTP headers. If no `expires` time is specified, the HTTP max-age header is used if present. If max-age is not present, the Expires HTTP header is used if present. Currently this is treated the same as if the mode were `Enums.KmlRefreshModeOnChange`.