Merge attribute handling from request and response to commen code.

packages/ipp/namewithoutlanguage.go

@@ -14,6 +14,10 @@ func NewNameWithoutLanguage(name, value string) *NameWithoutLanguage {
 	return c
 }
 
+func (c NameWithoutLanguage) Name() string {
+	return c.name
+}
+
 func (c NameWithoutLanguage) String() string {
 	return c.name + ":" + c.value
 }