diff --git a/edge_test.go b/edge_test.go
index 6c1cf4c..0c8adbf 100644
--- a/edge_test.go
+++ b/edge_test.go
@@ -6,7 +6,7 @@ func ExampleNewEdge() {
 	va := NewVertex("aaa")
 	vb := NewVertex("bbb")
 	vc := NewVertex("ccc")
-	vc.SetAttr(NewAttr("ddd", "eee"))
+	vc.AddAttr(NewAttr("ddd", "eee"))
 
 	eab := NewEdge(va, vb)
 	eac := NewEdge(va, vc)
diff --git a/graph.go b/graph.go
index 6f90dd9..726478a 100644
--- a/graph.go
+++ b/graph.go
@@ -13,7 +13,7 @@ type Graph interface {
 	AddEdge(...Edge)
 	Vertices() []Vertex
 	Edges() []Edge
-	StandaloneVertices() []Vertex
+	IsolatedVertices() []Vertex
 }
 
 type graph struct {
@@ -31,17 +31,17 @@ func NewGraph() Graph {
 func (g *graph) Vertices() []Vertex { return g.vertices }
 func (g *graph) Edges() []Edge      { return g.edges }
 
-func (g *graph) StandaloneVertices() []Vertex {
-	standaloneVertices := map[string]Vertex{}
+func (g *graph) IsolatedVertices() []Vertex {
+	isolatedVertices := map[string]Vertex{}
 	for _, vertex := range g.vertices {
-		standaloneVertices[vertex.ID()] = vertex
+		isolatedVertices[vertex.ID()] = vertex
 	}
 	for _, edge := range g.edges {
-		standaloneVertices[edge.Src().ID()] = nil
-		standaloneVertices[edge.Dst().ID()] = nil
+		isolatedVertices[edge.Src().ID()] = nil
+		isolatedVertices[edge.Dst().ID()] = nil
 	}
 	filtered := []Vertex{}
-	for _, vertex := range standaloneVertices {
+	for _, vertex := range isolatedVertices {
 		if vertex != nil {
 			filtered = append(filtered, vertex)
 		}
@@ -56,7 +56,7 @@ func (g *graph) String() string {
 	for _, edge := range g.edges {
 		elems = append(elems, edge.String())
 	}
-	for _, vertex := range g.StandaloneVertices() {
+	for _, vertex := range g.IsolatedVertices() {
 		elems = append(elems, vertex.ID())
 	}
 	return fmt.Sprintf("{%s}", strings.Join(elems, ","))
diff --git a/vertex.go b/vertex.go
index 4cbaa60..094d69c 100644
--- a/vertex.go
+++ b/vertex.go
@@ -10,12 +10,12 @@ type Vertex interface {
 
 	ID() string
 
-	AddEdge(edge Edge)
+	AddEdge(edges ...Edge)
 	Edges() []Edge
 	CleanEdges()
 
-	SetAttr(Attr)
-	DelAttr(key interface{})
+	AddAttr(attrs ...Attr)
+	DelAttr(keys ...interface{})
 	GetAttr(key interface{}) interface{}
 	HasAttr(key interface{}) bool
 	CleanAttrs()
@@ -44,11 +44,11 @@ func (n *vertex) CleanAttrs() {
 	n.attrs = nil
 }
 
-func (n *vertex) AddEdge(edge Edge) {
+func (n *vertex) AddEdge(edge ...Edge) {
 	if n.edges == nil {
 		n.edges = make([]Edge, 0)
 	}
-	n.edges = append(n.edges, edge)
+	n.edges = append(n.edges, edge...)
 }
 
 func (n *vertex) HasAttr(key interface{}) bool {
@@ -75,22 +75,26 @@ func (n *vertex) GetAttr(key interface{}) interface{} {
 	return nil
 }
 
-func (n *vertex) SetAttr(attr Attr) {
-	n.DelAttr(attr.Key())
+func (n *vertex) AddAttr(attrs ...Attr) {
+	for _, attr := range attrs {
+		n.DelAttr(attr.Key())
+	}
 	if n.attrs == nil {
 		n.attrs = make([]Attr, 0)
 	}
-	n.attrs = append(n.attrs, attr)
+	n.attrs = append(n.attrs, attrs...)
 }
 
-func (n *vertex) DelAttr(key interface{}) {
+func (n *vertex) DelAttr(keys ...interface{}) {
 	if n.attrs == nil {
 		return
 	}
-	for idx, attr := range n.attrs {
-		if attr.Key() == key {
-			n.attrs = append(n.attrs[:idx], n.attrs[idx+1:]...)
-			return
+	for _, key := range keys {
+		for idx, attr := range n.attrs {
+			if attr.Key() == key {
+				n.attrs = append(n.attrs[:idx], n.attrs[idx+1:]...)
+				return
+			}
 		}
 	}
 }
diff --git a/vertex_test.go b/vertex_test.go
index a70b2a8..c330dc7 100644
--- a/vertex_test.go
+++ b/vertex_test.go
@@ -3,20 +3,21 @@ package graphman
 import "fmt"
 
 func ExampleNewVertex() {
-	a := NewVertex("aaa")
-	fmt.Println(a)
-	fmt.Println(a.ID())
+	va := NewVertex("aaa")
+	fmt.Println(va)
+	fmt.Println(va.ID())
 
 	fmt.Println()
 
-	b := NewVertex("bbb")
-	b.SetAttr(NewAttr("ccc", "ddd"))
-	b.SetAttr(NewAttr(42, []string{"eee", "fff"}))
-	b.SetAttr(NewAttr("ggg", "hhh"))
-	b.DelAttr("ggg")
-	b.DelAttr("iii")
-	fmt.Println(b)
-	fmt.Println(b.ID())
+	vb := NewVertex("bbb")
+	vb.AddAttr(
+		NewAttr("ccc", "ddd"),
+		NewAttr(42, []string{"eee", "fff"}),
+		NewAttr("ggg", "hhh"),
+	)
+	vb.DelAttr("ggg", "iii")
+	fmt.Println(vb)
+	fmt.Println(vb.ID())
 
 	// Output:
 	// aaa