RE: [xsl] how do you determine if a property exists?

["Passin, Tom" <tpassin@xxxxxxxxxxxx>]

> From: David Buddrige [mailto:dbuddrige@xxxxxxxxx] 

> --- Jarno.Elovirta@xxxxxxxxx wrote:
> > if you want to test if the attribute
> > exists, then simply
> > 
> >   <xsl:when test="@Predecessors">
> > 
> 
> For some reason, this doesn't seem to work for me.  I
> am using saxon as my xslt processor.
> 
> I have the following data:
> 
> <?xml version="1.0" encoding="iso-8859-1"?>
> <info>
> 	<mytag duration="3 days" />
> 	<mytag />
> 	<mytag duration="6 hours" />
> 	<mytag duration="33 hours" />
> 	<mytag duration="" />
> 	<mytag duration="13 hours" />
> 	<mytag duration="5 days" />
> 	<mytag duration="" />
> 	<mytag duration="3 hours" />
> 	<mytag duration="23 hours" />
> </info>
> 
> 

Here is one way to do it.  There can be a million variations on the
theme -

<xsl:template match="/info">
<results>
  <xsl:for-each select='mytag'>
    <xsl:element name='myelement'>
      <xsl:choose>
        <xsl:when test='@duration != ""'>
          <xsl:copy-of select='@duration'/>
        </xsl:when>
        <xsl:otherwise>
          <xsl:attribute name='duration'>1</xsl:attribute>
        </xsl:otherwise>
      </xsl:choose>
    </xsl:element>
  </xsl:for-each>
</results>
</xsl:template>

Notice the sense of test.  This form picks up both a missing attribute
and an empty string value.

Cheers,

Tom P