Select All Data from List Using Caml Query and SharePoint Web Services

This code snippet for Select All data from List Using Caml Query and sharepoint web services.this use for out of box application.

var arr = new Array();
var a = new ActiveXObject("Microsoft.XMLHTTP");
var id="dwt";
var listName="testlist";
var query="<query><where><gt><fieldref name="ID"><value type="Counter">0</value></fieldref></gt></where></query>";
if (a == null) return null;

var getListRequest = "<!--?xml version=\"1.0\" encoding=\"utf-8\"?-->"
+ "<soap:envelope xmlns:xsi="\"http://www.w3.org/2001/XMLSchema-instance\"" xmlns:xsd="\"http://www.w3.org/2001/XMLSchema\"" xmlns:soap="\"http://schemas.xmlsoap.org/soap/envelope/\"">"
+ "<soap:body>"
+ "<getlistitems xmlns="\"http://schemas.microsoft.com/sharepoint/soap/\"">"
+ "<listname>" + listName + "</listname>"
+ "<query>" + query + "</query>"
+ "</getlistitems>"
+ "</soap:body>"
+ "</soap:envelope>";

a.Open("Post", http://servername:100/sites/Test/_vti_bin/Lists.asmx?op=GetListItems", false);

a.setRequestHeader("Content-Type:", "text/xml; charset=utf-8");
a.setRequestHeader("SOAPAction:", "http://schemas.microsoft.com/sharepoint/soap/GetListItems");
a.Send(getListRequest);
var xmlDoc = a.responseXML;