XSLT Cookbook

Creating Generic Node-Set Generators

Problem

You want to create reusable templates for generating a node set computationally.

Solution

The first generic function in this category generates a node set by executing a function over successive values, as defined by an incrementing function, until an upper bound is reached:

<xsl:template name="generic:gen-set"> <xsl:param name="x" select="1"/> <xsl:param name="func" select=" 'identity' "/> <xsl:param name="func-param1" select="$generic:generics[self::generic:func and @name = $func]/@param1"/> <xsl:param name="test-func" select=" 'less-than' "/> <xsl:param name="test-param1" select="$x + 1"/> <xsl:param name="incr-func" select=" 'incr' "/> <xsl:param name="incr-param1" select="1"/> <xsl:param name="i" select="1"/> <xsl:param name="result" select="/.."/> <!-- Check if aggregation should continue --> <xsl:variable name="continue"> <xsl:apply-templates select="$generic:generics[self::generic:func and @name = $test-func]"> <xsl:with-param name="x" select="$x"/> <xsl:with-param name="param1" select="$test-param1"/> </xsl:apply-templates> </xsl:variable> <xsl:choose> <xsl:when test="string($continue)"> <!--Compute func($x) --> <xsl:variable name="f-of-x"> <xsl:apply-templates select="$generic:generics[self::generic:func and @name = $func]"> <xsl:with-param name="x" select="$x"/> <xsl:with-param name="i" select="$i"/> <xsl:with-param name="param1" select="$func-param1"/> </xsl:apply-templates> </xsl:variable> <!-- Compute the next value of ...