Change a value in XSLT

[theone2007]

Hello;

Okay i have a XSLT file but i want to know how i can change a value. One of the fields returns null sometimes and i want to put a if statement and state that if there is no value meaning null input a comment.

This is what my code looks like right now

<th align="left">Abstract <font size="2" face="Arial, Helvetica, sans-serif">
   <xsl:value-of select="Abstract"/>
     <xsl:if test="./Abstract = &quot;null&quot;">
         <xsl:text> TEST </xsl:text> 
      </xsl:if>
   </font><br />
</th>

This returns everything xml and outputs the information in Abstract and right after the word null it will output TEST how can i change it so that instead of having null TEST it just says test.

Can someone please help me out Thank you.

[jkmyoung]

<xsl:choose>
  <xsl:when test="./Abstract = 'null'">test</xsl:when>
  <xsl:otherwise><xsl:value-of select="Abstract"/></xsl:otherwise>
</xsl:choose>
 

[theone2007]

Thanks A Lot that worked great;

Also how can i change the content if it shows
null 2001

how can i take out the word null and leave 2001 in there?
so it says 2001 instead of null 2001 ?

Thank you

[jkmyoung]

<xsl:choose>
  <xsl:when test="./Abstract = 'null'">test</xsl:when>
  <xsl:when test="contains(./Abstract,'null')">
    <xsl:value-of select="substring-before(Abstract,'null')"/>
    <xsl:value-of select="substring-after(Abstract,'null')"/>
  </xsl:when>
  <xsl:otherwise><xsl:value-of select="Abstract"/></xsl:otherwise>
</xsl:choose>