XML elements are required to be properly nested. Incorrect nesting of elements does not make sense to XML.
<rootelement> <childelement1>An element value.</childelement1> <childelement2>An element value. </rootelement> </childelement2>
<rootelement> <childelement1>An element value.</childelement1> <childelement2>An element value.</childelement2> </rootelement>