空字段 meaning in Chinese

null field

The method is called on an empty field handle
该方法在空字段句柄上调用。
Generates empty fields when only one product is ordered
的两个应用程序之一会产生空字段。
There are three ways of representing null fields in xml schema : optional attributes ,
有三种在xml schema中表示空字段的方法：可选的属性、
The record header is followed by the data contents of the columns . columns that are null are omitted
记录头的后面是字段的内容，其中空字段被忽略。
To save storage space by eliminating gaps , empty fields redundancy , or unnecessary data to shorten the length of records or files
通过删除间隙、空字段、冗馀项或不必要的数据以缩短记录或文件的长度来节省存储空间。