Merge attribute handling from request and response to commen code.

packages/ipp/resolution.go

@@ -40,6 +40,10 @@ func (r *resolution) unmarshal(byteStream io.Reader) {
 	binary.Read(byteStream, binary.BigEndian, &r.units)
 }
 
+func (r resolution) Name() string {
+	return r.name
+}
+
 func (r resolution) String() string {
 	return fmt.Sprintf("%v:%v,%v,%v", r.name, r.crossFeedResolution, r.feedResolution, r.units)
 }