ARCIMS Serverlet Connector查询属性，当属性为中文时乱码处理

问题救助描述：
我用AXL构造了一个SPATIALQUERY,返回字段中有一字段值是中文的（如BUILDLOC），但是我取得的是乱码。我查询的代码是：
                Dim arcimsRequest As HttpWebRequest = CType(WebRequest.Create(_serverURL), HttpWebRequest)
                arcimsRequest.Method = "POST"
                arcimsRequest.ContentType = "application/x-www-form-urlencoded"
                arcimsRequest.Timeout = _requestTimeout


                    Dim postWriter As StreamWriter = New StreamWriter(arcimsRequest.GetRequestStream())

                    postWriter.Write("<?xml version='1.0' encoding='UTF-8'?>")
                    postWriter.Write("<ARCXML version='1.1'>")
                    postWriter.Write(request.AXL)
                    postWriter.Write("</ARCXML>")
                    postWriter.Flush()
                    postWriter.Close()
                    arcimsRequest.Timeout = 100000   '100秒
                    Dim arcimsResponse As HttpWebResponse = CType(arcimsRequest.GetResponse(), HttpWebResponse)

                    Dim sr As StreamReader = New StreamReader(arcimsResponse.GetResponseStream, System.Text.Encoding.Default)
                    Try
                        response = sr.ReadToEnd()
                    Finally
                        sr.Dispose()
                    End Try

查了其返回的XML中头一句中有"encoding='GBK'"

我的环境是：WIN2003 SERVER 中文版，ORA 9i ZHS16GBK，IMS 9.2
且使用BUILDLOC显示的中文标注是对的。

另：在请求中，可不可以设置ARCIMS返回的XML的encoding？

问题解决方案：
经过2天的测试，发现竟然是因为ARCIMS92 Serverlet Connector对请求的AXL中单引号处理出错所致！原来这些代码在IMS90中是运行好好的。
最后处理：
                    Dim strAXL As String = request.AXL
                    If Not String.IsNullOrEmpty(strAXL) Then 'XML正则化，可以防止返回因请求导致的中文乱码

                        Dim doc As XmlDocument = New XmlDocument()
                        doc.LoadXml(strAXL)
                        If doc.DocumentElement Is Nothing Then
                            Throw New NullReferenceException("Node not set to instance of an object.  Can not parse AxlFragment.")
                        End If
                        strAXL = doc.DocumentElement.OuterXml
                    End If

                    Dim strRequest As String = "<?xml version=""1.0"" encoding=""UTF-8""?><ARCXML version=""1.1"">" & strAXL & "</ARCXML>"
让XmlDocument去正则化一次请求的AXL，这样就正常了。