I try to make a grammer with ANTLR with the following specifics.

It can parse an identifier like:

			foo > bar > 67
		

where foo > bar is the identifier, because if > followed by a letter it contains to the identifier and else its a greater than operator.

And I it should parse things like

			((a = 1) AND (b = 2)) OR (c = 3)
		

where the ( ) are necessary.

I'm really new to this topic and ANTLR and hope someone can help.