[Bug 5876] [XPath] Is it an error for an operator to be contained in parentheses?

http://www.w3.org/Bugs/Public/show_bug.cgi?id=5876





--- Comment #3 from Michael Kay <mike@saxonica.com>  2009-02-12 15:35:11 ---
I was asked at the XSL WG meeting on 5 Feb to produce a wording proposal to
resolve this.

Proposal:

For XPath and XQuery Appendix A.4:

(1) delete the sentence "Operators that have a lower precedence number cannot
be contained by operators with a higher precedence number."

(2) from the row labelled 19, delete the round and curly braces.

(3) Add after the table: "Note: parentheses can be used to override the
operator precedence in the usual way. Square brackets in an expression such as
A[B] serve two roles: they act as an operator causing B to be evaluated once
for each item in the value of A, and they act as parentheses enclosing the
expression B.
<XQuery-only>Curly braces in an expression such as validate{E} or ordered{E}
perform a similar bracketing role to the parentheses in a function call, but
with the difference in most cases that E is an Expr rather than ExprSingle,
meaning that it can use the comma operator.</XQuery-only>


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