[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] RE: quiz on select vs copy-of
This shouldn't be a dark corner, because the fact that nodes have identity is pretty fundamental, but sadly there are lots of people who aren't aware of the implications. The answer of course is (2). Michael Kay http://www.saxonica.com/ > -----Original Message----- > From: Oleg A. Paraschenko [mailto:olpa@x...] > Sent: 01 September 2005 20:45 > To: xml-dev > Subject: quiz on select vs copy-of > > Hello, > > do you know the dark corners of XSLT? Here is one. Compare two > variables: > > <xsl:variable name="v1" select="some-xpath"/> > <xsl:variable name="v2"><xsl:copy-of > select="some-xpath"/></xsl:variable> > > Are "v1" and "v2" the same? I mean: can "v1" and "v2" be used in a > program interchangeably? Answers: > > 1) yes > 2) no > 3) implementation-dependant > > . > . > . > . > . > . > . > . > . > . > . > . > . > . > . > . > . > . > . > . > . > . > . > . > > The right answer is (2): no. Changing a use of "v1" to > "v2", or reverse, > might change the result of a stylesheet. I'll post an example > later. Or > you can provide your version. > > > -- > Oleg Paraschenko olpa@ http://xmlhack.ru/ XML news in Russian > http://uucode.com/blog/ Generative Programming, XML, TeX, Scheme > > ----------------------------------------------------------------- > The xml-dev list is sponsored by XML.org <http://www.xml.org>, an > initiative of OASIS <http://www.oasis-open.org> > > The list archives are at http://lists.xml.org/archives/xml-dev/ > > To subscribe or unsubscribe from this list use the subscription > manager: <http://www.oasis-open.org/mlmanage/index.php> >
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