## Package net.sf.saxon.trace

This package provides an interface to Saxon tracing capabilities.

See:
Description

Interface Summary
InstructionInfo: Information about an instruction in the stylesheet, made available at run-time to a TraceListener
InstructionInfoProvider: An InstructionInfoProvider is an object that is capable of providing an InstructionInfo object which provides diagnostic information about an instruction or other construct such as a function, template, expression, or pattern.
TraceListener: This interface defines methods that are called by Saxon during the execution of a stylesheet, if tracing is switched on.

Class Summary
AbstractTraceListener: This is the standard trace listener used when the -T option is specified on the command line.
Location: This class holds constants identifying different kinds of location in a source stylesheet or query.
TimedTraceListener: A Simple trace listener that writes messages to System.err
TraceEventMulticaster: A class which implements efficient and thread-safe multi-cast event dispatching for the TraceListener evants.
XQueryTraceListener: A Simple trace listener for XQuery that writes messages (by default) to System.err
XSLTTraceListener: A Simple trace listener for XSLT that writes messages (by default) to System.err

## Package net.sf.saxon.trace Description

This package provides an interface to Saxon tracing capabilities.

The package was created by Edwin Glaser, and is intended primarily to provide an interface to an external trace and debugging package which will be developed independently. It also includes a simple trace capability which can be switched on from the command line, the API, or the stylesheet itself.

Michael H. Kay
21 July 2000