You want to apply a style to a table row ( <tr style="background-color:red ">) depending on a field value?

Needed code:

<tr>
  <xsl:attribute name="style">
    <xsl:choose>
      <xsl:when test="udt:NameOfResultColumn &gt; 100">
        background-color:red
      </xsl:when>
      <xsl:otherwise>
        background-color:green
      </xsl:otherwise>
    </xsl:choose>
  </xsl:attribute>