XmlObject - set value of element with a particular attribute

Hi,
In a xmlObject I try to set the value of xml element with a particular attribute but it doesn't work
//get value of element with a particular attribute
var myValue = xmlObject.ELEMENTS.ELEMENT.(@category == "myCategory"))// works fine
//set value of element with a particular attribute
var myValue = "foo"
xmlObject.ELEMENTS.ELEMENT.(@category == "myCategory"))= myValue // doesn't work
Thanks for your help
Regards

Hi Dirk,
For example :
var xmlObject = new XML ( "<rootElement> <elements> <element category='foo1'>value1</element> <element category='foo2'>value2</element> <element category='foo3'>value3</element> </elements></rootElement>");
myValue = xmlObject.elements.element.(@category == "foo1");
$.writeln(myValue)// return value1
// Now I want modify value1 to value99 like this
xmlObject.elements.element.(@category == "foo1")= "value99"; //doesn't work
I hope I was clear in my explanation ;-)
Regards

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