Simple Map Expression Grammar definition in the XPath

 The W3C XPath 3.0 Recommendation XPath 3.0 grammar defines Simple Map
expression in this way
(http://www.w3.org/TR/2014/REC-xpath-30-20140408/#id-map-operator):

[34]   SimpleMapExpr   ::=   PathExpr ("!" PathExpr)*

It follows from this rule that a SimpleMapExpr is, among other things,
any PathExpr  -- because "*" means "zero or more".

It seems rather weird to call an expression that doesn't contain any
instance of the simple map operator, a "simple mapping expression".

My guess is that the rule was meant as:

[34]   SimpleMapExpr   ::=   PathExpr ("!" PathExpr)+

According to this rule, a SimpleMapExpr should contain at least one
instance of the simple map operator.

Hope that this problem is acknowledged and the correction is included
in the Errata.

-- 
Cheers,
Dimitre Novatchev
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