When you constructed the message elementtarget using the Add/Edit dialog in Figure 8, you left the Type field as String so that the Value field could be the desired string constant.
在使用 图 8 中的 Add/Edit 对话框构建消息元素目标时，您将 Type 字段保留为 String，以便 Value 字段是所希望的字符串常量。
2
If you bind to element data, it should be the parent element of the targetelement; if you bind to attribute data, it should be the containing element.
如果绑定到元素数据，它就应该是目标元素的父元素；如果绑定到属性数据，它就应该是包含这个属性的元素。
3
First, that variable is set whenever the start of the targetelement is reached.