[xsl] Need better ways to do this..

["Sudhir Malhotra" <sudhirmalhotra123 at hotmail dot com>]

I am sure there are better ways to accomplish what I am
doing and trying to do. I would be thankful if you could
suggest one. I have explained my approach in the comments in
the XSL segment.

Questions:
1. How to prevent the output being generated for td[4], td[5], td[6] and 
td[7] if td[1] fails my validation as shown in the XSL segment?
2. How to avoid repitition of the XSL code for processing
td[4], td[5], td[6] and td[7]?

Thank you for your suggestions.

-sm

--Input XML segment--
<tr>
	  <td>19960529-00:00:00.000 CDT</td>
	  <td>115.269997</td>
	  <td>49.669998</td>
	  <td>2.320717</td>
	  <td>2.314239</td>
	  <td>2.295786</td>
	  <td>2.332692</td>
	  <td>0.018453</td>
</tr>
<tr>
	  <td>19960530-00:00:00.000 CDT</td>
	  <td>112.650002</td>
	  <td>49.019900</td>
	  <td>2.298042</td>
	  <td>2.308282</td>
	  <td>2.290944</td>
	  <td>2.325620</td>
	  <td>0.017338</td>
</tr>
------

-- XSL segment --
<!-- Look for the timestamp, and validate it. -->
<xsl:template match="tr/td[1]">
<xsl:variable name="currentDate" select="."/>
       <xsl:variable name="isValid"  select="datelogicext:checkValidity( 
$StartDateObject, string( $currentDate ))"/>
	<xsl:choose>
<!-- If valid, print the timestamp within XData tag -->
<!-- Then go for other values in tr/td[4], tr/td[5], tr/td[6] and tr/td[7] 
-->
<!-- The code is working fine when the date is valid -->
              <xsl:when test=" $isValid = 'YES'  ">
		<XData>
		<xsl:value-of select="."/>
		</XData>
		</xsl:when>
                <xsl:otherwise>
<!-- A futile attempt to skip to next tr and not process this tr
since td[1] is invalid. -->
		<xsl:apply-templates mode="INVALID" select="tr/td"/>
                </xsl:otherwise>
	 </xsl:choose>
</xsl:template>

<xsl:template mode="INVALID" match="tr/td" >
</xsl:template>

<!-- COPY PROCESSING for positions 4-7 -->
<xsl:template match="tr/td[4 ]">
             <xsl:choose>
                        <xsl:when test=" .  = 'NA'  ">
                         <YData>-9999</YData>
                              </xsl:when>
                              <xsl:otherwise>
                              <YData><xsl:value-of select="."/></YData>
                              </xsl:otherwise>
          </xsl:choose>
</xsl:template>

<xsl:template match="tr/td[5 ]">
             <xsl:choose>
	                         <xsl:when test=" .  = 'NA'  ">
	                          <YData>-9999</YData>
                                </xsl:when>
                                 <xsl:otherwise>
                                 <YData><xsl:value-of select="."/></YData>
                                 </xsl:otherwise>
          </xsl:choose>
</xsl:template>

<xsl:template match="tr/td[6 ]">
             <xsl:choose>
	                         <xsl:when test=" .  = 'NA'  ">
	                          <YData>-9999</YData>
                                </xsl:when>
                                 <xsl:otherwise>
                                 <YData><xsl:value-of select="."/></YData>
                                 </xsl:otherwise>
          </xsl:choose>
</xsl:template>

<xsl:template match="tr/td[7 ]">
             <xsl:choose>
	                         <xsl:when test=" .  = 'NA'  ">
	                          <YData>-9999</YData>
                                </xsl:when>
                                 <xsl:otherwise>
                                 <YData><xsl:value-of select="."/></YData>
                                 </xsl:otherwise>
          </xsl:choose>
</xsl:template>
--------------------
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