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## org.apache.xalan.xslt.trace
Interface TraceListener

All Known Implementing Classes:
  PrintTraceListener

public interface TraceListener
extends java.util.EventListener

**For advanced use only** Interface the XSL processor calls when it matches a source node, selects a set of source nodes, or generates a result node. If you want an object instance to be called when a trace event occurs, use the XSLTEngineImpl setTraceListener method.

See Also:
  `TracerEvent.java`, `org.apache.xalan.xslt.XSLTEngineImpl#setTraceListener`

Method Summary
`void` | `generated(GenerateEvent ev)` **For advanced use only** Method that is called just after the formatter listener is called.
`void` | `selected(SelectionEvent ev)` **For advanced use only** Method that is called just after the formatter listener is called.
`void` | `trace(TracerEvent ev)` **For advanced use only** Method that is called when a trace event occurs.

Method Detail

### trace

    public void trace(TracerEvent ev)

  **For advanced use only** Method that is called when a trace event occurs. The method is blocking. It must return before processing continues.
  Parameters:
    `ev` - the trace event.

### selected

    public void selected(SelectionEvent ev)
                  throws org.xml.sax.SAXException

  **For advanced use only** Method that is called just after the formatter listener is called.
  Parameters:
    `ev` - the generate event.

### generated

    public void generated(GenerateEvent ev)

  **For advanced use only** Method that is called just after the formatter listener is called.
  Parameters:
    `ev` - the generate event.

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