Simple roundtrip from ipptool works.

packages/ipp/operationid_string.go

@@ -0,0 +1,50 @@
+// Code generated by "stringer -type operationId"; DO NOT EDIT.
+
+package ipp
+
+import "strconv"
+
+func _() {
+	// An "invalid array index" compiler error signifies that the constant values have changed.
+	// Re-run the stringer command to generate them again.
+	var x [1]struct{}
+	_ = x[PrintJob-2]
+	_ = x[PrintURI-3]
+	_ = x[ValidateJob-4]
+	_ = x[CreateJob-5]
+	_ = x[SendDocument-6]
+	_ = x[SendURI-7]
+	_ = x[CancelJob-8]
+	_ = x[GetJobAttributes-9]
+	_ = x[GetJobs-10]
+	_ = x[GetPrinterAttributes-11]
+	_ = x[HoldJob-12]
+	_ = x[ReleaseJob-13]
+	_ = x[RestartJob-14]
+	_ = x[PausePrinter-16]
+	_ = x[ResumePrinter-17]
+	_ = x[PurgeJobs-18]
+}
+
+const (
+	_operationId_name_0 = "PrintJobPrintURIValidateJobCreateJobSendDocumentSendURICancelJobGetJobAttributesGetJobsGetPrinterAttributesHoldJobReleaseJobRestartJob"
+	_operationId_name_1 = "PausePrinterResumePrinterPurgeJobs"
+)
+
+var (
+	_operationId_index_0 = [...]uint8{0, 8, 16, 27, 36, 48, 55, 64, 80, 87, 107, 114, 124, 134}
+	_operationId_index_1 = [...]uint8{0, 12, 25, 34}
+)
+
+func (i operationId) String() string {
+	switch {
+	case 2 <= i && i <= 14:
+		i -= 2
+		return _operationId_name_0[_operationId_index_0[i]:_operationId_index_0[i+1]]
+	case 16 <= i && i <= 18:
+		i -= 16
+		return _operationId_name_1[_operationId_index_1[i]:_operationId_index_1[i+1]]
+	default:
+		return "operationId(" + strconv.FormatInt(int64(i), 10) + ")"
+	}
+}