设置默认值为0。
如果模式检验没有提供默认值,还可以设置默认值,见清单15。
Optionally, you can set default values if they are not given by the schema validation, as shown in Listing 15.
如图19所示,变量属性的Details选项卡有一个设置默认值的复选框。
As Figure 19 shows, the Details TAB of the properties for a variable has a checkbox set to a default value.
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