blank string

基本解释

The first character is a delimiter, so the first item WORD finds is a blank string.
第一个字符是分隔符，所以 WORD 找到的第一项是一个空字符串。
Note that complex types (such as MyBO in Figure 17) also show a blank string because only the simple type fields of a business object can have values.
请注意，复杂的类型（如图 17 中的 MyBO）还显示一个空字符串，这是因为只有业务对象的简单类型字段才具有值。
A title, which expresses a short, human readable subject line for the entry, and can be a blank string (represented by an empty title element, such as )
标题（title），简短的、人类可读的记录主体行；允许使用空字符串（用空的标题元素表示，如）。