public static bool TryFrom(string value, AreaMap area, out QueryETag etag)
{
etag = null;
var parts = value.Split('@');
if (parts.Length > 0 && FlowKey.TryFrom(parts[0], area, out var key))
{
var checkpoint = parts.Length == 2 && long.TryParse(parts[1], out var position)
? new TimelinePosition(position)
: TimelinePosition.None;
etag = new QueryETag(key, checkpoint);
}
return(etag != null);
}
