Value MUST be part of code list 'Longitude direction'.
/ubl:CatalogueRequest/cac:CatalogueRequestLine/ext:UBLExtensions/ext:UBLExtension/ext:ExtensionContent/cac:DeliveryLocation/cac:LocationCoordinate/cbc:LongitudeDirectionCode(some $code in $cllongitude satisfies $code = normalize-space(text()))