// poConfigXML - xml file loaded earlier
var lsUrl:String;
var spzcgf:Namespace = poConfigXML.namespace("spzcgf");

// return null
lsUrl = poConfigXML.spzcgf::config.family.(genealogy.@code=="0").viewer.@url;

// return viewers/papviewer.swf
lsUrl = poConfigXML..family.(genealogy.@code=="0").viewer.@url;