TailCall

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CallTemplate.CallTemplatePackage
```
public interface TailCall
```
Interface representing a Tail Call. This is a package of information passed back by a called instruction to its caller, representing a call (and its arguments) that needs to be made by the caller. This saves stack space by unwinding the stack before making the call.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`TailCall`	`processLeavingTail()`	Process this TailCall (that is, executed the template call that is packaged in this object).

- Method Detail
  - processLeavingTail
```
TailCall processLeavingTail()
                     throws XPathException
```
    Process this TailCall (that is, executed the template call that is packaged in this object). This may return a further TailCall, which should also be processed: this is the mechanism by which a nested set of recursive calls is converted into an iteration.
    
    Returns:
    
    a further TailCall, if the recursion continues, or null, indicating that the recursion has terminated.
    
    Throws:
    
    XPathException - if any error occurs processing the tail call

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