June 2008
Intermediate to advanced
986 pages
27h 8m
English
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[2.0] Datatype Operators—instance of, castable as, cast as, and treat as
As you would expect, a language that supports datatypes
and constructors also has operators to convert a value from one type
to another. XPath 2.0 provides four operators: instance of, castable as, cast
as, and treat as. We’ll
cover those here.
instance of
The instance of
operator lets us see whether a value is an instance of a
particular datatype. Here are some examples:
<?xml version="1.0"?>
<!-- instance-of.xsl --> <xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:xs="http://www.w3.org/2001/XMLSchema"> <xsl:output method="text"/> <xsl:template match="/"> <xsl:text>
Some tests of the "instance of" operator:</xsl:text> <xsl:text>

 '1995-04-21' instance of xs:date: </xsl:text> <xsl:value-of select="'1995-04-21' instance of xs:date"/> <xsl:text>
 xs:date('1995-04-21') instance of xs:date: </xsl:text> <xsl:value-of select="xs:date('1995-04-21') instance of xs:date"/> <xsl:text>

 3 instance of xs:integer: </xsl:text> <xsl:value-of select="3 instance of xs:integer"/> <xsl:text>
 '3' instance of xs:integer: </xsl:text> <xsl:value-of select="'3' instance of xs:integer"/> <xsl:text>
 number('3') instance of xs:integer: </xsl:text> <xsl:value-of select="number('3') instance of xs:integer"/> <xsl:text>
 number('3') instance of xs:double: </xsl:text> <xsl:value-of select="number('3') instance of xs:double"/> <xsl:text>
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.