XSLT: Set XSLT variable via choose

gistfile1.xslt

<xsl:variable name="Qty">
  <xsl:choose>
        <xsl:when test="Item_Item/Item_Locations/Item_Location[LocationID = $LocationID and ChannelID = $ChannelID]/Quantity = ''">
          <xsl:text>0</xsl:text>
        </xsl:when>
        <xsl:otherwise>
          <xsl:value-of select="substring-before(Item_Item/Item_Locations/Item_Location[LocationID = $LocationID and ChannelID = $ChannelID]/Quantity,'.')"/>
        </xsl:otherwise>
  </xsl:choose>
</xsl:variable>

I have always felt that variables are quite limited in XSLT. Once you set them, you cannot change them and
I was always trying to create a choose statement and set my variable to different values in the choose but you can’t do that because then the scope of the variable is only in that choose.

The way to do it is to not use the select attribute for setting the attribute but rather put the choose INSIDE the variable like Charles does here…