Subject: Re: [xsl] Casting single-item sequences to atomic values From: Michael Kay <mike@xxxxxxxxxxxx> Date: Tue, 8 Apr 2014 18:31:58 +0100 |
On 8 Apr 2014, at 14:42, Wendell Piez <wapiez@xxxxxxxxxxxxxxx> wrote: > Christian, > > This is easy to find in the spec ... if you look at the right spec. :-) > > http://www.w3.org/TR/xpath-datamodel/#sequences > > Cheers, Wendell > It might also be worth reminding people WHY a singleton and a sequence of length one are the same thing in XDM. Consider <book> <author>John</author> </book> Is child::author a single element, or a sequence of elements with length one? You can't tell without a schema. Treating both the same way is part of the "semi-structuredness" of XPath as an XML processing language. Contrast data binding tools, which rely on a schema to decide whether author is a single-valued or list-valued property, and cause your programs to break if the schema changes. Michael Kay Saxonica
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