for \$x in 
collection('/db/DRIVER/entity/datasource')//INTERFACE[$cond$]
return 
	<ROW>
		<REPO 
			id="{\$x/../../../../HEADER/RESOURCE_IDENTIFIER/@value/string()}" 
			name="{\$x/../../OFFICIAL_NAME/text()}" 
			country="{\$x/../../COUNTRY/text()}" 
			prefix="{\$x/../..//EXTRA_FIELDS/FIELD[./key='NamespacePrefix']/value}" />
		{\$x}
	</ROW>