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| NodeElem (Element* elem, unsigned line) | NodeElem | 
The node owns the element. Caller must not modify / delete.
Parameters:
| elem | the element to hold. | 
| line | line of configuration where node was created. | 
| ~NodeElem () | ~NodeElem | 
| DEFINE_VISITABLE () | DEFINE_VISITABLE | 
| const Element&  val () | val | 
[const]
Returns: the element in this node.