in src/main/java/org/apache/sling/rewriter/impl/components/TraxErrorHandler.java [42:53]
public void warning(TransformerException exception)
throws TransformerException {
final String message = getMessage(exception);
if (this.logger != null) {
this.logger.warn(message);
} else {
System.out.println("WARNING: " + message);
}
warnings.append("Warning: ");
warnings.append(message);
warnings.append("\n");
}