[]=( index, element ) public

Sets an element, replacing any previous matching element. If no existing element is found ,the element is added.

index:Used to find a matching element to replace. See []().
element:The element to replace the existing element with the previous element
Returns:nil if no previous element was found.
 doc = Document.new '<a/>'
 doc.root.elements[10] = Element.new('b')    #-> <a><b/></a>
 doc.root.elements[1]                        #-> <b/>
 doc.root.elements[1] = Element.new('c')     #-> <a><c/></a>
 doc.root.elements['c'] = Element.new('d')   #-> <a><d/></a>
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