all: use variables for xml.Name values

carddav/carddav.go

@@ -6,15 +6,11 @@ import (
 	"github.com/emersion/go-vcard"
 )
 
-const namespace = "urn:ietf:params:xml:ns:carddav"
-
 type AddressBook struct {
 	Href        string
 	Description string
 }
 
-var addressBookName = xml.Name{namespace, "addressbook"}
-
 type AddressBookQuery struct {
 	Props []string
 }