OptionalerrorOptionalfeatureComplete feature snapshot for add/update; delete entries omit it.
工作副本内稳定的本地对象 ID;v2 为正安全整数。
Stable edit identity. Multiple revisions of one feature keep the same identity when merged.
Monotonically increasing local revision.
Optionalserver上传快照锁定的远端对象 ID;未确认新增时为空。
Current upload state. Uncertain adds are not retried by default.
Effective operation after log merging.
一个要素当前唯一有效的待提交编辑。