The E4X is a java script standard that is officially released by them. It extends the direct support of xml in java scripts. It allows the user to declare a xml variable in the same way an array is declared.
For Example:
var x = new XML()
var employees=
<employees>
<person>
<name>Tove</name>
<age>32</age>
</person>
<person>
<name>Jani</name>
<age>26</age>
</person>
</employees>;
document.write(employees.person.(name == "Tove").age);
The E4X on being used by the user greatly reduces the amount of code that has to be written to execute an operation.