Re: Check if XML tag exists?

[Oliver Becker <obecker@xxxxxxxxxxxxxxxxxxxxxxx>]

Hi David,

> Is there a way I can check if a TAG in the XML data exists or not, even
> though the possibly existing TAG will not have any value?
> 
> Background is... in this instance everything would be hidden.
> 
> <RESTRICTED_FIELD_LIST>
> 
>   <HIDE_OFFICE_ALL />
>   <HIDE_HOME_ALL />
> 
> </RESTRICTED_FIELD_LIST>
> 
> But in this instance ALL the Office info would be hidden while only  the
> Home Address info would be hidden.
> 
> <RESTRICTED_FIELD_LIST>
> 
>   <HIDE_OFFICE_ALL />
>   <HIDE_HOME_ADDRESS />
> 
> </RESTRICTED_FIELD_LIST>
> 
> The HIDE_HOME_ALL is no longer in the data.
> 
> Can I check to see if a TAG exists or not?

You want to check if an *element* exists or not. :-)
Well, probably the following template does what you want:

<xsl:template match="RESTRICTED_FIELD_LIST">
   <xsl:if test="HIDE_HOME_ALL">
      <!-- Ah, HIDE_HOME_ALL is present -->
      <!-- Do something reasonable ... -->
   </xsl:if>
</xsl:template>

Note: if you want to test wether an element is empty or not, you
have to compare with '' or apply the string function:
   <xsl:if test="string(HIDE_HOME_ALL)">
      <!-- HIDE_HOME_ALL is present and not empty -->
   </xsl:if>
   
Hope that helps,
Oliver


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