Append — indicating that the value of arg is to be appended to the value of the variable, if defined.
append——指示如果定义了arg的值，其值将会附加到变量值之后。
Prefix — indicating that the value of arg is to be prepended to the value of the variable, if defined.
prefix——指示如果定义了arg的值，其值将会添加到变量值前面。
A simple XForms trigger is used to create the submit button that upon activation will invoke the two (or more if defined and invoked) submission actions, as shown Listing 4.
使用一个简单的XForms触发器创建一个提交按钮，激活的时候调用两个(还可以更多)提交动作，如清单4所示。
A simple XForms trigger is used to create the submit button that upon activation will invoke the two (or more if defined and invoked) submission actions, as shown Listing 4.
使用一个简单的XForms触发器创建一个提交按钮，激活的时候调用两个(还可以更多)提交动作，如清单4所示。
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