Make Bounds implement Object with a dummy ObjectID method

bounds.go

@@ -46,3 +46,9 @@ func (b *Bounds) ContainsNode(n *Node) bool {
 
 	return true
 }
+
+// ObjectID always returns 0 because bounds do not have an id.
+// It exists to implement the Object interface.
+func (b *Bounds) ObjectID() ObjectID {
+	return 0
+}

object.go

@@ -92,6 +92,7 @@ type Object interface {
 	private()
 }
 
+func (n *Bounds) private()    {}
 func (n *Node) private()      {}
 func (w *Way) private()       {}
 func (r *Relation) private()  {}

osmxml/scanner.go

@@ -83,6 +83,10 @@ Loop:
 
 		s.next = nil
 		switch strings.ToLower(se.Name.Local) {
+		case "bounds":
+			bounds := &osm.Bounds{}
+			err = s.decoder.DecodeElement(&bounds, &se)
+			s.next = bounds
 		case "node":
 			node := &osm.Node{}
 			err = s.decoder.DecodeElement(&node, &se)
@@ -122,6 +126,7 @@ Loop:
 
 // Object returns the most recent token generated by a call to Scan
 // as a new osm.Object. This interface is implemented by:
+//	*osm.Bounds
 //	*osm.Node
 //	*osm.Way
 //	*osm.Relation

osmxml/scanner_test.go

@@ -144,6 +144,21 @@ func TestScanner_userNote(t *testing.T) {
 	}
 }
 
+func TestScanner_bounds(t *testing.T) {
+	r := boundsReader()
+	scanner := New(context.Background(), r)
+	defer scanner.Close()
+
+	if v := scanner.Scan(); !v {
+		t.Fatalf("should read first scan: %v", scanner.Err())
+	}
+
+	b := scanner.Object().(*osm.Bounds)
+	if b.MinLat != 1 || b.MinLon != 2 || b.MaxLat != 3 || b.MaxLon != 4 {
+		t.Fatalf("did not scan correctly, got: %v", b)
+	}
+}
+
 func TestAndorra(t *testing.T) {
 	f, err := os.Open("../testdata/andorra-latest.osm.bz2")
 	if err != nil {
@@ -232,6 +247,15 @@ func userNoteReader() io.Reader {
 	return bytes.NewReader(data)
 }
 
+func boundsReader() io.Reader {
+	data := []byte(`<?xml version="1.0" encoding="UTF-8"?>
+<osm>
+	<bounds minlat="1" minlon="2" maxlat="3" maxlon="4"/>
+</osm>`)
+
+	return bytes.NewReader(data)
+}
+
 func changesetReader() io.Reader {
 	data := []byte(`<?xml version="1.0" encoding="UTF-8"?>
 <osm version="0.6" generator="replicate_changesets.rb" copyright="OpenStreetMap and contributors" attribution="http://www.openstreetmap.org/copyright" license="http://opendatacommons.org/licenses/odbl/1-0/">