xsl:if and xsl:choose

The xsl:if instruction cannot express an else condition. It has a single input port, and a single output port, as shown in Figure 262.

Figure 262. xsl:if Instruction Block

Once fully defined, the xsl:if block generates code like the following:

<Review> 
	<xsl:if test="authors/author= 'Minollo'"> 
		<xsl:value-of select="'Recommended'"/> 
	</xsl:if> 
	<xsl:if test="contains(authors/author,'Pedruzzi')"> 
		<xsl:value-of select="'A best buy'"/> 
	</xsl:if> 
</Review>

If you need to express an else condition, use the xsl:choose instruction block. This instruction block has two output ports by default, one for the xsl:when test= attribute, and one for the one xsl:otherwise element.

Figure 263. xsl:choose Instruction Block

The xsl:choose instruction block generates code like the following:

<Review> 
	<xsl:choose> 
		<xsl:when test="authors/author= 'Minollo'"> 
			<xsl:value-of select="'Recommended'"/> 
		</xsl:when> 
		<xsl:when test="contains(authors/author,'Pedruzzi')"> 
			<xsl:value-of select="'authors best buy'"/> 
		</xsl:when> 
		<xsl:otherwise> 
			<xsl:value-of select="'bah...'"/> 
		</xsl:otherwise> 
	</xsl:choose> 
</Review>

If you need to define more than one xsl:when test= attribute, use the xsl:choose shortcut menu (right click) and select Add When Port.


Note		Stylus Studio generates the `xsl:otherwise` element by default for all `xsl:choose` instructions.

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