Merge pull request #48 from twpayne/empty

Add EmptyElement

Author: twpayne

kml.go

@@ -38,6 +38,9 @@ type Element interface {
 	xml.Marshaler
 }
 
+// An EmptyElement is an empty KML element.
+type EmptyElement struct{}
+
 // A ParentElement is a KML element with children.
 type ParentElement interface {
 	Element
@@ -61,6 +64,16 @@ func MakeElements[S []T, T Element](s S) []Element {
 	return elements
 }
 
+// Empty returns a new EmptyElement.
+func Empty() *EmptyElement {
+	return &EmptyElement{}
+}
+
+// MarshalXML implements encoding/xml.Marshaler.MarshalXML.
+func (e *EmptyElement) MarshalXML(*xml.Encoder, xml.StartElement) error {
+	return nil
+}
+
 func encodeElement(encoder *xml.Encoder, startElement xml.StartElement) error {
 	if err := encoder.EncodeToken(startElement); err != nil {
 		return err

kml_test.go

@@ -294,6 +294,11 @@ func TestSimpleElements(t *testing.T) {
 			element:  kml.GxIntValue(1),
 			expected: "<gx:value>1</gx:value>",
 		},
+		{
+			name:     "Empty",
+			element:  kml.Empty(),
+			expected: "",
+		},
 	} {
 		t.Run(tc.name, func(t *testing.T) {
 			var builder strings.Builder