Re: What class of grammars is an =?UTF-8?Q?XPath=3F?=
On Thu, 27 Jan 2011 18:06:02 +0000, Michael Kay <email@example.com> wrote: >> The particular expression that Michael brought up -- >> sum(//order/@value) > 826 -- certainly implies an open language (the >> document must have at least one //order/@value). > > > Um, no: the expression is perfectly well-defined on a document that > contains no orders (it's been a slack week, where are all the > customers?). There's some kind of implication that the expression is > designed to work on documents containing zero or more orders, but > that's all we can say. ?? If the constraint is that sum(//order/@value) > 826 must be true, then it follows that //order/@value must have at least one member. Cheers Rick Jelliffe
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