Flex complex XML structure parsing

Question : in Flex, how to filter an items list embedded in a complex XML event ?

Answer :
- retrieve the exact XML path as per the corresponding embedded schema
- iterate over the received XMLList, providing this path filter


Details :

Step #1 : consider the following XML tree, containing a block of <objInst> nodes to be mapped into corresponding Java business instances :

<root>
    <tag1>tag1_value</tag1>
    <tag2>tag2_value</tag2>
    <config>
        <tag3>tag3_value</tag3>
        <tag4>tag4_value</tag4>
        <dir>
            <objInst>
                <tag1_obj>tag1_obj1_value</tag1_obj>
                <tag2_obj>tag1_obj1_value</tag2_obj>
                <tag3_obj>tag1_obj1_value</tag3_obj>
            <objInst>
            <objInst>
                <tag1_obj>tag1_obj2_value</tag1_obj>
                <tag2_obj>tag1_obj2_value</tag2_obj>
                <tag3_obj>tag1_obj2_value</tag3_obj>
            <objInst>
            <objInst>
                <tag1_obj>tag1_obj3_value</tag1_obj>
                <tag2_obj>tag1_obj3_value</tag2_obj>
                <tag3_obj>tag1_obj3_value</tag3_obj>
            <objInst>
        </dir>
    </config>
    <tag5>tag5_value</tag5>
</root>

Step #2 : upon receipt of the HTTPService ResultEvent (event below), here is the easiest/safest way to iterate over the received XMLList :

try
{
    for each (var objInst:XML in new XML(event.result.config.dir).elements())
    {
        // accessing objInst tag1 value simply via : objInst.tag1_obj
        // accessing objInst tag2 value simply via : objInst.tag2_obj
        // accessing objInst tag2 value simply via : objInst.tag3_obj
        // ...
    }
}
catch (e:Error)
{
    // In case the XML response is not properly formatted
}

Nota: the <root> XML node must be omitted in the above 'event.result.config.dir' notation, since 'event.result' already corresponds to the <root> node of the downloaded XML document.