However, in V6.1.2 and later, these empty elements are no longer created unless you explicitly create a mapping.
然而，在V6.1.2或更高版本，这些空元素不再被创建，除非您显式创建了映射。
If you were to create a schema to predict what's coming down the pike at you, you'd end up with tables that have lots of empty fields or lots of mapping tables.
若是创建一个模式来预测将会出现什么数据字段，结果很可能会得到内含大量空字段的表或大量的映射表。
You also need to delete all mapping groups that are empty.
你还需要删除说有空的映射组。
Creates a new, empty device mapping for the destination.
为迁移创建一个新的、空的设备图。
Creates a new, empty device mapping for the destination.
为迁移创建一个新的、空的设备图。
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