Subject: RE: [xsl] Re: What is $p in the definition of fn:subsequence ? From: "Michael Kay" <mike@xxxxxxxxxxxx> Date: Sat, 5 Jul 2008 14:19:45 +0100 |
> The spec doesn't specify the desired behavior if $length is <= 0. > > Should the function return the empty sequence, a reversed > subsequence (if $length is < 0) or should an error be raised? > The same question goes for fn:substring(). > I think these questions are answered by the equivalences given in the (corrected) spec. subsequence((1 to 10), 5, -3) is equivalent to (1 to 10)[5 le position() and position() lt 5 - 3] which is an empty sequence. The same applies to substring(). (Note, in case you are wondering why it is this way: subsequence was deliberately designed to imitate substring(), and substring() was designed on the 1.0 design principle of "no runtime errors except as a last resort") Michael Kay http://www.saxonica.com/
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