diff --git a/internal/opcodesxml/opcodesxml.go b/internal/opcodesxml/opcodesxml.go
new file mode 100644
index 0000000..e2a4dd0
--- /dev/null
+++ b/internal/opcodesxml/opcodesxml.go
@@ -0,0 +1,64 @@
+package opcodesxml
+
+import (
+	"encoding/xml"
+	"io"
+	"os"
+)
+
+func Read(r io.Reader) (*InstructionSet, error) {
+	d := xml.NewDecoder(r)
+	is := &InstructionSet{}
+	if err := d.Decode(is); err != nil {
+		return nil, err
+	}
+	return is, nil
+}
+
+func ReadFile(filename string) (*InstructionSet, error) {
+	f, err := os.Open(filename)
+	if err != nil {
+		return nil, err
+	}
+	defer f.Close()
+
+	return Read(f)
+}
+
+type InstructionSet struct {
+	Name         string        `xml:"name,attr"`
+	Instructions []Instruction `xml:"Instruction"`
+}
+
+type Instruction struct {
+	Name    string `xml:"name,attr"`
+	Summary string `xml:"summary,attr"`
+	Forms   []Form `xml:"InstructionForm"`
+}
+
+type Form struct {
+	GASName          string            `xml:"gas-name,attr"`
+	GoName           string            `xml:"go-name,attr"`
+	MMXMode          string            `xml:"mmx-mode,attr"`
+	XMMMode          string            `xml:"xmm-mode,attr"`
+	CancellingInputs bool              `xml:"cancelling-inputs,attr"`
+	Operands         []Operand         `xml:"Operand"`
+	ImplicitOperands []ImplicitOperand `xml:"ImplicitOperand"`
+	ISA              []ISA             `xml:"ISA"`
+}
+
+type Operand struct {
+	Type   string `xml:"type,attr"`
+	Input  bool   `xml:"input,attr"`
+	Output bool   `xml:"output,attr"`
+}
+
+type ImplicitOperand struct {
+	ID     string `xml:"id,attr"`
+	Input  bool   `xml:"input,attr"`
+	Output bool   `xml:"output,attr"`
+}
+
+type ISA struct {
+	ID string `xml:"id,attr"`
+}
diff --git a/internal/opcodesxml/opcodesxml_test.go b/internal/opcodesxml/opcodesxml_test.go
new file mode 100644
index 0000000..24a16c0
--- /dev/null
+++ b/internal/opcodesxml/opcodesxml_test.go
@@ -0,0 +1,14 @@
+package opcodesxml
+
+import (
+	"fmt"
+	"testing"
+)
+
+func TestReadFile(t *testing.T) {
+	is, err := ReadFile("testdata/x86_64.xml")
+	if err != nil {
+		t.Fatal(err)
+	}
+	fmt.Printf("%#v\n", is)
+}