Schema update fails if the schemas are not compatible.
如果模式不兼容，模式更新就会失败。
Schema update failed: syntax mismatch.
架构更新失败：语法不匹配。
Schema update failed: class in poss-superiors does not exist.
架构更新失败：poss-superior中的类别不存在。
Schema update failed: class in poss-superiors does not exist.
架构更新失败：poss-superior中的类别不存在。
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