Simple roundtrip from ipptool works.

packages/ipp/naturallanguagage.go

@@ -0,0 +1,43 @@
+package ipp
+
+import (
+	"io"
+)
+
+type naturalLanguagage struct {
+	name  string
+	value string
+}
+
+func newNaturalLanguagage(name, value string) *naturalLanguagage {
+	c := new(naturalLanguagage)
+	c.name = name
+	c.value = value
+	return c
+}
+
+func (c naturalLanguagage) String() string {
+	return c.name + ":" + c.value
+}
+func (c *naturalLanguagage) valueTag() tag {
+	return naturalLanguagageValueTag
+}
+
+func (c *naturalLanguagage) unmarshal(byteStream io.Reader) {
+	c.name, c.value = unmarshalSingleValue(byteStream)
+}
+
+func (c *naturalLanguagage) marshal() []byte {
+	l := 5 + len(c.name) + len(c.value)
+	b := make([]byte, l, l)
+	b[0] = byte(naturalLanguagageValueTag)
+	marshalNameValue(c.name, c.value, b[1:])
+	return b
+}
+
+func (c *naturalLanguagage) size() int {
+	l := 1 + 4 // The attribute tag + 2 lengths
+	l += len(c.name)
+	l += len(c.value)
+	return l
+}