[xsl] Assigning value to variable based on xsl:choose test

Hello

Is it possible to set the value of a variable based upon a test?

My first effort is below, and I also tried to assign the value to the
variable using xsl:attribute but that doesn't work either.

<xsl:choose>
        <xsl:when test="price_type = 56"><xsl:variable name="numTickets"
select="8"/></xsl:when>
        <xsl:when test="price_type = 57"><xsl:variable name="numTickets"
select="4"/></xsl:when>
        <xsl:otherwise><xsl:variable name="numTickets"
select="9"/></xsl:otherwise>
</xsl:choose>

...

<xsl:call-template name="counter">
      <xsl:with-param name="max" select="$numTickets"/>
</xsl:call-template>


I'm guessing that one cannot assign values to variables inline like
this, but I've not managed to get it working so a bit of guidance that
will help me work this out would be much appreciated.

Regards, David

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