Implemented support for elements who nested in another elements.
Previously only this type of nesting has been working:
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<CustomerOrder>
 <customerOrderPosition></customerOrderPosition>
 <customerOrderPosition></customerOrderPosition>
 <customerOrderPosition></customerOrderPosition>
 <customerOrderPosition></customerOrderPosition>
</CustomerOrder>
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Now one more type of nesting is available:
<Good>
 <salePrices>
  <price></price>
  <price></price>
 </salePrices>
</Good>
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