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This is used by VarRW when an element being read is not available. For example, if the route is IPv4, but the IPv6 representation is being asked for.
The dispatcher also treats Null arguments as a special case by returning a Null.
| static const char* id | id |
| ElemNull ()
| ElemNull |
| ElemNull (const char* )
| ElemNull |
| string str ()
| str |
[const]
Reimplemented from Element.
