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Simplified production for FilterExpr in XPath spec?

Subject: Simplified production for FilterExpr in XPath spec?
From: "Paul W. Abrahams" <abrahams@xxxxxxxxxxx>
Date: Mon, 17 Jul 2000 23:03:02 -0400
The production in the XPath spec for FilterExpr is:

    FilterExpr ::= PrimaryExpr | FilterExpr Predicate

It would seem that the following rewritten version would be
much more transparent:

    FilterExpr ::= PrimaryExpr  Predicate*

(A number of other productions, e.g., OrExpr, could be
similarly rewritten.)

Does anyone know why the production was written the way it
was?

Paul Abrahams



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