diff --git a/xobject.go b/xobject.go
index f9ae64c..2edfe93 100644
--- a/xobject.go
+++ b/xobject.go
@@ -24,6 +24,13 @@ func NewXoFromJsonStr(jsonStr string) *XObject {
 	}
 }
 
+func NewXoString(val string) *XObject {
+	p := new(XObject)
+	p._type = XOT_SIMPLE
+	p._val = NewXString(val)
+	return p
+}
+
 func (this *XObject) Size() int {
 	if (this._type == XOT_ARRAY) {
 		array := this._val.([]*XObject)
@@ -43,6 +50,18 @@ func (this *XObject) GetType() int8 {
 	return this._type
 }
 
+func (this *XObject) IsSimple() bool {
+	return this.GetType() == XOT_SIMPLE
+}
+
+func (this *XObject) IsArray() bool {
+	return this.GetType() == XOT_ARRAY
+}
+
+func (this *XObject) IsObject() bool {
+	return this.GetType() == XOT_OBJECT
+}
+
 func (this *XObject) AsXValue() *XValue {
 	if this._type == XOT_SIMPLE {
 		if this._val == nil {
@@ -92,6 +111,20 @@ func (this *XObject) HasKey(key string) bool {
 	}
 }
 
+func (this *XObject) GetSimpleStr(key string, defVal string) string {
+	if this.IsObject() {
+		val := this.At(key)
+		if val != nil {
+			if val.IsSimple() {
+				return val.AsXValue().GetString()
+			} else {
+				return defVal
+			}
+		}
+	}
+	return defVal
+}
+
 func (this *XObject) readFromJsonString(data string) bool {
 	jsonType := JsonStrType(data)
 	if jsonType == JSON_OBJECT {