Log the beginning of an operation, using the info previously specified,
and remembering the current operation name to use on subsequent calls
to logEnd(), LogDenied(), etc.
This interface must be implemented by any class that expects to be
called by the Logger class to log entries to a target (XML DOM, file,
Writer, ServletContext, etc.)
This class makes it possible for Java servlets to access an existing
Logger that may be stored in the servlet's Session context,
the servlet's ServletContext (application context), or as the Logger
global singleton.
Log the progress of the calling routine in generating its data stream,
and check for errors that have occurred when the calling routine wrote
to its XMLWriter.
Log the progress of the calling routine in generating its data stream,
and check for errors that have occurred when the calling routine wrote
to this XMLWriter.