它使用占位符变量和简单的逻辑语句定义应该在模板中填充的数据。
It USES placeholder variables and simple logic statements to define what data should be populated into the template.
使用set语句来更改逻辑树中现有的字段或者在这些字段不存在的情况下创建它们。
Use the SET statement to alter existing fields in the logical tree or to create them in circumstances where they do not already exist.
对于某些替换，需要修改程序逻辑或链接语句。
For some replacements, you may need to change the program logic or linkage statements.
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