<xsl:choose>
  <xsl:when test=".."> ... </xsl:when>
  <xsl:when test=".."> ... </xsl:when>
  <xsl:otherwise> . . .    </xsl:otherwise>
</xsl:choose>

• xsl:choose provides either or processing
• Set of xsl:when elements tested in order
• If none match, xsl:otherwise is obeyed

For example, colour code the different types of CD