Thanks Jackie!<br><br><div class="gmail_quote">On Mon, May 14, 2012 at 11:50 AM, Jackie Ng [via OSGeo.org] <span dir="ltr">&lt;<a href="/user/SendEmail.jtp?type=node&node=4974502&i=0" target="_top" rel="nofollow" link="external">[hidden email]</a>&gt;</span> wrote:<br>
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        Try: NullValue(property, replacement_value_if_null)
<br><br>Support for this expression function may vary.
<br><br>- Jackie
        
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