namespaces in nested xml elements

Question

I have seen afew answers to the problem i am having now but mine is that of a nested one.

I have an xml looking like this:

> 
<em>
<type xmlns="http://www.sitcom-project.org/sitcom" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <model>
    <implemented_with>comoco</implemented_with>
    <implemented_in>perl</implemented_in>
    <cash_flow>casual</cash_flow>
    <interaction>conventional</interaction>
  </model>
</type>
</em>

now, how do i access the element of the implemented_with node?

ofc i could access the xmlList this way: namespace ns = www.sitcom-project.org/sitcom; type.ns::model; but now, how do i access the implemented_with node in the model xmlList? i tried type.ns::model.implemented_with, but didn't work. Anyone got any idea? thanks

Nicholas · Accepted Answer · 2010-12-31 02:04:50Z

1

There are a couple ways to do this, but the best way is to use a namespace prefix before each dot access. In your case the first thing you want to do is to isolate the namespace. You can do this by hard coding the namespace into a new namespace object... ie;

var ns:Namespace = new Namespace( "http://www.sitcom-project.org/sitcom" );

Or a better way is to just extract it from the appropriate node. In the following code I am getting all the namespaces (as an array) declared on the type node, and just targeting the first one in the list. Because I don't know the namespace beforehand, I have to retrieve it using the children() method.

var emNode:XML = _yourXML.em[0];
var typeRoot:XML = emNode.children()[0]; 
var ns:Namespace = typeRoot.namespaceDeclarations()[0];

Once you have accomplished this, you can use namespace syntax to dig into your model.

var impWith:String = typeRoot.ns::model.ns::implemented_with;

This can be a little verbose, so you can set the default namespace using the following syntax. I don't like this personally, but it does work.

default xml namespace = ns;
var impWith:String = typeRoot.model.implemented_with;
default xml namespace = null;

A simple one-liner could be.

var ns:Namespace = new Namespace("http://www.sitcom-project.org/sitcom");
var imp:String = _yourXML.em[0].ns::type.ns::model.ns::implemented_with;

Using the default syntax

default xml namespace = new Namespace("http://www.sitcom-project.org/sitcom");
var imp:String = _yourXML.em[0].type.model.implemented_with;
default xml namespace = null;

Hope this helps.

edited Dec 31, 2010 at 2:04

answered Dec 30, 2010 at 16:46

Nicholas

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2 Comments

alxx Over a year ago

ActionScript has a catch with default xml namespace. When you finished with it, you must reset it to empty namespace, or runtime errors may occur.

Nicholas Over a year ago

Edited my answer to reflect your comment

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