The GRG file defines what the input database files are, what the formatted output is to look like, and how to process the input to get to the output. It takes the form of a list of predefined macros (one per line), most of which take arguments, and all of which are optional (except DATABASE of which there must be at least one, see section DATABASE). These have three general forms. They can define an internal structure or process (such as how to sort or filter the data). They can define user macros and equations that are expanded within text bodies. They can define text bodies themselves. A text body is a block of text associated with a particular page or output position.
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