所以首先要使用[：]符号创建一个空映射。
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。
However, in V6.1.2 and later, these empty elements are no longer created unless you explicitly create a mapping.
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。
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.
使用基于结构的IO方法时，RPG将为输入和输出缓冲区创建初始存储空间，并为空指示符映射创建存储空间。
When using the structure based IO method, RPG will create the initial storage for the input and output buffers, along with storage for the null indicator map.
当spu视图从一个空的邮箱中读取信息时，它会停止执行，直到有值写入自己的内存映射寄存器中为止。
When an SPU tries to read from an empty mailbox, it will stop execution until some value is written to its memory-mapped register.
如果列被定义为支持空值，那么您必须相应更新空指示符映射。
If the column is defined as null capable, then you must update the null indicator map accordingly.
这就为类型系统设计提供了将空(null)对象映射为其对应的xml类型的灵活性。
This provides the flexibility in type system design to map null objects to their corresponding XML types.
如果“Distinguishednameof abaseentryinthisrepository”保留为空，则基本项将映射到LDAP服务器的根(“ ”)，并且所有操作都将在根目录处执行。
If "Distinguished name of a base entry in this repository" is left blank, then the base entry will be mapped to the root (" ") of the LDAP server and all the operations will be performed at root.
通过指针映射集和故障模型，可以自动检测空指针引用内存故障，提高了测试效率。
Through pointer mapping set and fault model, it can detect null pointer dereference faults automatically and increases the testing efficiency.
针对此问题，提出了一种新的基于空时分组码(STBC)的并行选择映射算法。
A novel concurrent selective mapping (SLM) algorithm with space-time block coded (STBC) was proposed to solve this problem.
通过指针映射集和故障模型，可以自动检测内存释放异常、内存泄露和空指针引用等动态内存故障，提高了测试效率。
Through pointer mapping sets and fault model, it can detect bad deallocation, memory leak and null pointer dereference faults automatically and increase the testing efficiency.
即证明了每一上半连续非空紧凸值集值映射至少存在一个该映射不动点集的极小连续本质集，以及该极小连续本质集是连通的。
It is proved that there exist at least one minimal continuously essential set of fixed points, and the minimal continuously essential set is connected.
即证明了每一上半连续非空紧凸值集值映射至少存在一个该映射不动点集的极小连续本质集，以及该极小连续本质集是连通的。
It is proved that there exist at least one minimal continuously essential set of fixed points, and the minimal continuously essential set is connected.
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