当一个变化是一个关系，相关的外键的属性设置为空值。
When a change is made to a relationship, the related foreign-key property is set to a null value.
注意：在清单6中，我们还将两个显示参数(title和border)设置为空值。
NOTE: in listing 6, notice that we also set two display parameters (title and border) to empty values.
在DB 2fori 6.1发布之前，SQLUpdate和insert语句能够使用一个值为- 1的指示符变量，将支持空值的列设置为空值。
Prior to the DB2 for I 6.1 release, SQL Update and Insert statements could use an indicator variable with a value of -1 to set a null capable column to the null value.
如果Accept标头为空，这意味着该客户端可接受任何类型，因此设置了缺省值。
If the accept header is null, this means that the client accepts any type, so the default is set.
每次使用后，用户名和密码的线程本地存储值都被重新设置为空。
After each use, the thread local storage values of username and password are reset to null.
如果是前一种情况，那么该列的指示符变量被设置为- 1，这导致该列被更新为空值。
If the former is true, then the indicator variable for that column is set to -1 which results in the column being updated with the null value.
冗余的图片可将al t值设置为空，但有意义的图片应用有意义的语句设置。
Redundant images can be set with an empty Alt value, but meaningful images should be set with a meaningful sentence.
但是，在这种情况下，这个链接的ref属性会设置为“null”值，而且链接的文本内容会隐藏起来，除非将显示空链接内容的标志设置为true。
However in this case, the link's ref attribute will be set to the value "null," and the link's text content will be hidden unless a flag to show null-link content is set to true.
为此，请转到该页面的Editpagesettings，并将param . sharing . scope(在Advancedoptions-iwant tosetparameters下面)设置为某个非空值，例如scope1。
To do so, go to Edit page Settings for that page and set param.sharing.scope (under Advanced options - I want to set parameters) to a non-empty value such as scope1.
为空变量设置一个默认值。
为空变量设置一个默认值。
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