[antlr-interest] Newby question

[fridi70 at gmx.de]

I have a grammar file in which a text file structure and a complete logic (basic like with if-then-else etc) is described in.
Because of it's complexity, I would like to extract a separate grammar for "logic". So I want one grammar for the file (header, footer...) and an additional grammar for the logic only.

How can I achive this and how do I concatinate thoose 2 grammars?

Thanks in advance
  fridi



start	
	: file;

file
	: header content footer? EOF
	;	
	
content
	: logic? table*
	;

logic	
	: (PAGE_DECLARATION 
	   | line)+
	  END
	;
	
line
	: w = PREFIX command 
	;

command	
	: ifStatement | THEN | ELSE | actionSeq
	;

ifStatement	
	: IF^ expression
	;
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