User Guide

Using XML namespaces 327

The for..in statement lets you iterate over a set of property names in an XMLList:

var total:Number = 0;

for (var pname:String in myXML.item)

{

total += myXML.item.@quantity[pname] * myXML.item.price[pname];

}

The for each..in statement lets you iterate through the properties in the XMLList:

var total2:Number = 0;

for each (var prop:XML in myXML.item)

{

total2 += prop.@quantity * prop.price;

}

Using XML namespaces

Namespaces in an XML object (or document) identify the type of data that the object

contains. For example, in sending and delivering XML data to a web service that uses the

SOAP messaging protocol, you declare the namespace in the opening tag of the XML:

var message:XML =

<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"

soap:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">

<soap:Body xmlns:w="http://www.test.com/weather/">

<w:getWeatherResponse>

<w:tempurature >78</w:tempurature>

</w:getWeatherResponse>

</soap:Body>

</soap:Envelope>;

The namespace has a prefix, soap, and a URI that defines the namespace, http://

schemas.xmlsoap.org/soap/envelope/

ActionScript 3.0 includes the Namespace class for working with XML namespaces. For the

XML object in the previous example, you can use the Namespace class as follows:

var soapNS:Namespace = message.namespace("soap");

trace(soapNS); // Output: http://schemas.xmlsoap.org/soap/envelope/

var wNS:Namespace = new Namespace("w", "http://www.test.com/weather/");

message.addNamespace(wNS);

var encodingStyle:XMLList = message.@soapNS::encodingStyle;

var body:XMLList = message.soapNS::Body;

message.soapNS::Body.wNS::GetWeatherResponse.wNS::tempurature = "78";