Questions on the notation used in the spec

[Joel Reymont]

Folks,

I'm trying to create a Yacc grammar for ES4 and I have trouble  
understanding the notation used in the spec.

For example, there's

alpha = { allowColon, noColon }
beta  = { allowIn, noIn }
gamma = { allowExpr, noExpr }

and then

ParenExpression (  AssignmentExpression /allowColon, allowIn/  )

as well as

FunctionExpression /alpha, beta/
   function  Identifier  FunctionSignature  FunctionExpressionBody / 
alpha, beta/
   function  FunctionSignature  FunctionExpressionBody /alpha, beta/

How should I interpret these?

I also see other notation such as omega, tau, local, global, etc. Are  
these documented somewhere?

	Thanks, Joel

--
http://wagerlabs.com