Syntaxes

The syntax of a union declaration is:

	UNION 
			 map-declaration 
			 map-declaration 
			[map-declaration
] 
		... 
			[map-declaration
] 
	END UNION

The syntax of a map declaration is as follows.

	MAP 
		        field-declaration 
	   	[field-declaration] 
		... 
	       	[field-declaration] 
	END MAP