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Base for classes able to transport Xrls.
| ~XrlSender () | ~XrlSender | 
[virtual]
| typedef XorpCallback2<void, const XrlError&, XrlArgs*>::RefPtr Callback | Callback | 
| bool  send (const Xrl& xrl, const Callback& scb) | send | 
[pure virtual]
Parameters:
| xrl | Xrl to be sent. | 
| scb | callback to be invoked with result from Xrl | 
Returns: true if Xrl is accepted for sending, false otherwise.
| bool  pending () | pending | 
[const pure virtual]
Return true if sender has send requests pending.