Empty tags

Hi,

  How does one handle empty tags? For eg, consider the following xml:
  
  <address>
     <street_1>xxxx Drive</street_1>
     <street_2><street_2>
     <city>Bethesda</city>
     <state>MD</state>
  </address>
  
  
    Xsl:
    
   <xsl:template match="address">
       <P>Street 1:
          <xsl:value-of select="street_1"/></P>
       <P>Street 2 :
         <xsl:value-of select="street_2"/></P>
       <P>City :
         <xsl:value-of select="city"/></P>   
       <P>State :
         <xsl:value-of select="state"/></P> 
   </xsl:template>

In this case the header for street_2 is printed out. This is what I want to 
avoid. 

Thanks

Minita.


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