Merged branch

https://svn.apache.org/repos/asf/xmlgraphics/fop/branches/Temp_ProcessingFeedback
into Trunk.

Changes on branch:
........
  r615153 | jeremias | 2008-01-25 10:07:21 +0100 (Fr, 25 Jan 2008) | 1 line
  
  Created temporary branch for processing feedback.
........
  r615155 | jeremias | 2008-01-25 10:11:59 +0100 (Fr, 25 Jan 2008) | 1 line
  
  Initial commit of what I've built already for those who prefer code to minimalistic design docs.
........
  r615278 | jeremias | 2008-01-25 18:25:00 +0100 (Fr, 25 Jan 2008) | 1 line
  
  EventProducer interfaces now operational.
........
  r615773 | jeremias | 2008-01-28 10:06:16 +0100 (Mo, 28 Jan 2008) | 1 line
  
  No casting in client code when creating EventProducer instances.
........
  r616242 | vhennebert | 2008-01-29 11:34:45 +0100 (Di, 29 Jan 2008) | 3 lines
  
  Trick to avoid hard-coding the class name of EventProducer in the source file.
  Feel free to revert if it's not ok.
........
  r616900 | jeremias | 2008-01-30 21:59:31 +0100 (Mi, 30 Jan 2008) | 1 line
  
  Generate event model XMLs in to the build directory: build/gensrc and build/test-gensrc (the latter is new and needs to be setup as source folder in your IDE!)
........
  r616907 | jeremias | 2008-01-30 22:12:59 +0100 (Mi, 30 Jan 2008) | 1 line
  
  Added an XMLResourceBundle that uses an XML file instead of a properties file to load the translations. The XML format is the same as for Cocoon's XMLResourceBundle.
........
  r617097 | vhennebert | 2008-01-31 11:53:21 +0100 (Do, 31 Jan 2008) | 2 lines
  
  Minor typo + slight improvement of Javadoc
........
  r617176 | jeremias | 2008-01-31 19:14:19 +0100 (Do, 31 Jan 2008) | 5 lines
  
  Renamed FopEvent to Event as suggested by Simon.
  EventProducerCollectorTask.java now reads the EventSeverity from a doclet tag.
  Added generation of EventProducer translations (including simple merging, no validation, yet)
  EventFormatter introduced (only basic functionality, yet).
  Added a simple EventListener implementation that uses EventFormatter to convert the events to human-readable, localized messages that are sent to the log via Commons Logging.
........
  r617362 | jeremias | 2008-02-01 08:18:07 +0100 (Fr, 01 Feb 2008) | 1 line
  
  Some remaining rename operations based on an earlier discussion.
........
  r617413 | jeremias | 2008-02-01 10:46:26 +0100 (Fr, 01 Feb 2008) | 2 lines
  
  Extracted formatting functionality into utility class AdvancedMessageFormat.java.
  AdvancedMessageFormat.java now supports conditional sub-groups (delimited by []).
........
  r618682 | jeremias | 2008-02-05 17:07:08 +0100 (Di, 05 Feb 2008) | 1 line
  
  Add support for special object formatters (where toString() isn't good enough). ATM, it's hard-coded but could later be hooked into dynamic discovery if we have multiple such formatters. The SAX Locator is the only example for now.
........
  r618686 | jeremias | 2008-02-05 17:12:56 +0100 (Di, 05 Feb 2008) | 3 lines
  
  Hooked most of FONode into the new event mechanism. The FOUserAgent provides a DefaultEventBroadcaster instance.
  If a producer method declares throwing an exception, the event is automatically marked FATAL and the dynamic proxy throws an exception right after notifying the listeners.
  The exceptions are created through the EventExceptionManager. It currently contains only one exception factory for ValidationException. If we need more such factories it's better to register them dynamically. Right now, they're hard-coded.
........
  r619313 | jeremias | 2008-02-07 10:14:15 +0100 (Do, 07 Feb 2008) | 1 line
  
  Make sure no events are now just silently swallowed because after upgrading a user doesn't know about the event system.
........
  r619314 | jeremias | 2008-02-07 10:14:46 +0100 (Do, 07 Feb 2008) | 1 line
  
  Log what translation file is being written.
........
  r619320 | jeremias | 2008-02-07 10:31:00 +0100 (Do, 07 Feb 2008) | 2 lines
  
  FObj hooked into the event system.
  Code reduction using a protected method on FONode to acquire a FOValidationEventProducer.
........
  r619359 | jeremias | 2008-02-07 11:59:19 +0100 (Do, 07 Feb 2008) | 2 lines
  
  Fop's QName now extends XGCommons' QName to initiate a transition.
  Hooked PropertyList into the event mechanism.
........
  r631252 | jeremias | 2008-02-26 16:24:33 +0100 (Di, 26 Feb 2008) | 1 line
  
  Removed superfluous warning.
........
  r631268 | jeremias | 2008-02-26 17:08:11 +0100 (Di, 26 Feb 2008) | 1 line
  
  Deprecated two methods which are a problem for localization. Also helps finding additional spots to switch over to the event mechanism.
........
  r633852 | jeremias | 2008-03-05 15:20:24 +0100 (Mi, 05 Mrz 2008) | 1 line
  
  Add severity to formatting parameters.
........
  r633855 | jeremias | 2008-03-05 15:21:57 +0100 (Mi, 05 Mrz 2008) | 4 lines
  
  Added support for additional field styles:
  {<fieldname>,if,<true-text>,<false-text>}
  {<fieldname>,equals,<test-string>,<true-text>,<false-text>}
........
  r633856 | jeremias | 2008-03-05 15:24:04 +0100 (Mi, 05 Mrz 2008) | 2 lines
  
  Javadocs and TODOs.
  EventListeners can change the event severity.
........
  r633857 | jeremias | 2008-03-05 15:27:08 +0100 (Mi, 05 Mrz 2008) | 4 lines
  
  Javadocs.
  Moved out event listener registration into a CompositeEventListener.
  Event broadcaster uses the events effective severity, not the initial value (for the case where listeners override the initial value).
  Set up a special EventBroadCaster in the FOUserAgent that filters events through a class (FOValidationEventListenerProxy) that adjusts the event severity for relaxed validation.
........
  r633858 | jeremias | 2008-03-05 15:32:07 +0100 (Mi, 05 Mrz 2008) | 2 lines
  
  Instead of always decentrally checking whether strict validation is enabled or not, this is now done in a special event listener. The event producer method caller simply indicates whether it can recover from the error condition and continue.
  Started switching to event production in table FOs.
........
  r634027 | jeremias | 2008-03-05 21:58:35 +0100 (Mi, 05 Mrz 2008) | 7 lines
  
  Moved AdvancedMessageFormat into its own package.
  AdvancedMessageFormat got the following added functionality:
  - Alternative conditional regions [ bla {field}] -> [ bla {field1}| even more bla {field2}]
  - Functions: functions get access to the parameters and they can produce an object that is then formatted ({#gatherContextInfo})
  - "if" and "equals" format moved to top-level classes and added by dynamic registration.
  EventFormatter now supports includes in the form {{includeName}} so you can include other entries from the resource bundle for better reuse.
  Some more events in table code.
........
  r634031 | jeremias | 2008-03-05 22:05:22 +0100 (Mi, 05 Mrz 2008) | 1 line
  
  SVN Props
........
  r634208 | jeremias | 2008-03-06 11:26:52 +0100 (Do, 06 Mrz 2008) | 2 lines
  
  Improved context gathering.
  Moved GatherContextInfoFunction to an inner class of FONode to reduce visibilities.
........
  r634209 | jeremias | 2008-03-06 11:28:14 +0100 (Do, 06 Mrz 2008) | 1 line
  
  Made FOPException localizable.
........
  r634280 | jeremias | 2008-03-06 15:38:30 +0100 (Do, 06 Mrz 2008) | 2 lines
  
  ExceptionFactory is now dynamically registered.
  More table warnings and errors switch to events.
........
  r634326 | jeremias | 2008-03-06 17:08:16 +0100 (Do, 06 Mrz 2008) | 1 line
  
  Remaining table FOs switched to events.
........
  r634328 | jeremias | 2008-03-06 17:09:21 +0100 (Do, 06 Mrz 2008) | 1 line
  
  Deprecated FOP's QName. Mixing with Commons' variant only produces problems.
........
  r634381 | jeremias | 2008-03-06 20:12:57 +0100 (Do, 06 Mrz 2008) | 2 lines
  
  Made the "invalidChild" event fully localizable by adding a "lookup" field for the optional rule to be displayed.
  And a few switches to the event system.
........
  r634692 | jeremias | 2008-03-07 15:31:43 +0100 (Fr, 07 Mrz 2008) | 1 line
  
  More FO tree stuff switched to events.
........
  r634712 | jeremias | 2008-03-07 16:19:21 +0100 (Fr, 07 Mrz 2008) | 1 line
  
  Avoid an NPE that says nothing (ex. could happen if the message template is wrong).
........
  r634738 | jeremias | 2008-03-07 17:38:21 +0100 (Fr, 07 Mrz 2008) | 2 lines
  
  Non-FO children were not properly run through validation by FOTreeBuilder.
  Unified the way that non-FO elements are validated. Some FOs were already fixed. I now fixed the rest, so foreign elements can occur everywhere.
........
  r637833 | jeremias | 2008-03-17 12:01:41 +0100 (Mo, 17 Mrz 2008) | 1 line
  
  Exception while cloning for RetrieveMarker to be handled by user as suggested by Andreas.
........
  r637835 | jeremias | 2008-03-17 12:03:31 +0100 (Mo, 17 Mrz 2008) | 1 line
  
  Throw a RuntimeException of no other Exception class is specified for an event as a fallback if someone just sets the event severity to FATAL.
........
  r637838 | jeremias | 2008-03-17 12:06:10 +0100 (Mo, 17 Mrz 2008) | 1 line
  
  Throw a meaningful exception when the property name is wrong. Otherwise, there will be an ArrayIndexOutOfBoundsException.
........
  r637859 | jeremias | 2008-03-17 13:35:26 +0100 (Mo, 17 Mrz 2008) | 1 line
  
  Throw a meaningful exception when the property name is wrong. Otherwise, there will be an ArrayIndexOutOfBoundsException.
........
  r637938 | jeremias | 2008-03-17 16:19:51 +0100 (Mo, 17 Mrz 2008) | 1 line
  
  Switched pagination package to events.
........
  r637947 | jeremias | 2008-03-17 16:45:16 +0100 (Mo, 17 Mrz 2008) | 1 line
  
  Removed unlocalizable validation helper methods.
........
  r637952 | jeremias | 2008-03-17 16:59:02 +0100 (Mo, 17 Mrz 2008) | 1 line
  
  Events on FOTreeBuilder.
........
  r638299 | jeremias | 2008-03-18 11:09:30 +0100 (Di, 18 Mrz 2008) | 2 lines
  
  Added support for java.util.text's ChoiceFormat to AdvancedMessageFormat.
  Reuse the regexes as constants.
........
  r638302 | jeremias | 2008-03-18 11:17:06 +0100 (Di, 18 Mrz 2008) | 1 line
  
  Events for inline-level layout managers.
........
  r638774 | jeremias | 2008-03-19 11:17:36 +0100 (Mi, 19 Mrz 2008) | 1 line
  
  Added DEBUG level.
........
  r638777 | jeremias | 2008-03-19 11:23:40 +0100 (Mi, 19 Mrz 2008) | 3 lines
  
  Generalized FOValidationEventListenerProxy into FOPEventListenerProxy, the main proxy for FOP's own event manipulation proxy. Done because of support for overflow="hidden" vs. overflow="error-if-overflow".
  Switched block-level layout managers to events.
  Some cleanup along the way.
........
  r639222 | jeremias | 2008-03-20 10:27:34 +0100 (Do, 20 Mrz 2008) | 2 lines
  
  Some initial work for event forwarding from Batik.
  Missing errors/exceptions converted to events in PageSequenceMaster.
........
  r639270 | jeremias | 2008-03-20 13:50:35 +0100 (Do, 20 Mrz 2008) | 1 line
  
  Removed DEBUG event severity again. Promoted constrained geometry adjustment event to INFO level as per discussion.
........
  r640395 | jeremias | 2008-03-24 13:39:13 +0100 (Mo, 24 Mrz 2008) | 3 lines
  
  Moved the creation of the fallback LoggingEventListener to FOUserAgent so event before the startDocument() SAX event arrive in the log.
  Dynamic discovery of event models. Renderers and extensions can register renderer-specific event models.
  Switched the most important parts of the renderers to events (maybe not everything is converted).
........
  r640397 | jeremias | 2008-03-24 13:43:04 +0100 (Mo, 24 Mrz 2008) | 1 line
  
  Remaining fixcrlfs. Xalan likes to mix CRLF and LF on Windows.
........
  r640398 | jeremias | 2008-03-24 13:43:54 +0100 (Mo, 24 Mrz 2008) | 1 line
  
  Ignore namespace declarations for property handling.
........
  r640463 | jeremias | 2008-03-24 17:59:52 +0100 (Mo, 24 Mrz 2008) | 2 lines
  
  Event in area package.
  Exposed getUserAgent() in Renderer interface (was already public in AbstractRenderer).
........
  r642972 | jeremias | 2008-03-31 14:18:39 +0200 (Mo, 31 Mrz 2008) | 1 line
  
  Code restructured a bit.
........
  r642975 | jeremias | 2008-03-31 14:24:07 +0200 (Mo, 31 Mrz 2008) | 2 lines
  
  Plugged fonts package into the event subsystem. Note: I did not follow the same pattern as for the rest as the font package is to be considered FOP-external, so I just added a manual adapter for the FontEventListener. This demonstrates how an external library can be integrated with the event system.
  Missing warning for unknown formatting objects added. Warning is not issued by the ElementMappingRegistry anymore but by FOTreeBuilder which has access to more context information.
........
  r642997 | jeremias | 2008-03-31 16:10:08 +0200 (Mo, 31 Mrz 2008) | 1 line
  
  Added an example to demonstrate how to write your own event listener and how to deal with the exceptions thrown in the process.
........
  r642998 | jeremias | 2008-03-31 16:13:40 +0200 (Mo, 31 Mrz 2008) | 1 line
  
  Removed unused method. Event formatting should not be part of the Event class. Use EventFormatter.format(Event) instead.
........
  r643066 | jeremias | 2008-03-31 19:18:54 +0200 (Mo, 31 Mrz 2008) | 1 line
  
  First part of the event subsystem documentation (DRAFT).
........
  r643784 | jeremias | 2008-04-02 10:05:33 +0200 (Mi, 02 Apr 2008) | 1 line
  
  More documentation.
........
  r643785 | jeremias | 2008-04-02 10:06:38 +0200 (Mi, 02 Apr 2008) | 1 line
  
  Some nits.
........
  r643787 | jeremias | 2008-04-02 10:24:41 +0200 (Mi, 02 Apr 2008) | 1 line
  
  Completed javadocs
........
  r643824 | jeremias | 2008-04-02 12:00:30 +0200 (Mi, 02 Apr 2008) | 1 line
  
  Javadocs.
........
  r645847 | vhennebert | 2008-04-08 12:54:16 +0200 (Di, 08 Apr 2008) | 2 lines
  
  Minor typo fixes
........
  r645848 | vhennebert | 2008-04-08 12:58:30 +0200 (Di, 08 Apr 2008) | 2 lines
  
  Another small typo fix
........
  r647678 | jeremias | 2008-04-14 09:20:26 +0200 (Mo, 14 Apr 2008) | 1 line
  
  Renamed *EventProducer.Factory.create() to *EventProducer.Provider.get() to better reflect what the method does (instances may be cached and reused).
........


git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@647742 13f79535-47bb-0310-9956-ffa450edef68

2 files changed, 260 insertions, 0 deletions

diff --git a/examples/embedding/java/embedding/events/ExampleEvents.java b/examples/embedding/java/embedding/events/ExampleEvents.java
new file mode 100644
index 000000000..9c52e4ba1
--- /dev/null
+++ b/examples/embedding/java/embedding/events/ExampleEvents.java
@@ -0,0 +1,227 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/* $Id$ */
+ 
+package embedding.events;
+
+import java.io.BufferedOutputStream;
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.OutputStream;
+import java.net.URL;
+
+import javax.xml.transform.Result;
+import javax.xml.transform.Source;
+import javax.xml.transform.Transformer;
+import javax.xml.transform.TransformerException;
+import javax.xml.transform.TransformerFactory;
+import javax.xml.transform.sax.SAXResult;
+import javax.xml.transform.stream.StreamSource;
+
+import org.xml.sax.SAXException;
+
+import org.apache.commons.io.IOUtils;
+
+import org.apache.fop.apps.FOPException;
+import org.apache.fop.apps.FOUserAgent;
+import org.apache.fop.apps.Fop;
+import org.apache.fop.apps.FopFactory;
+import org.apache.fop.apps.MimeConstants;
+import org.apache.fop.events.Event;
+import org.apache.fop.events.EventFormatter;
+import org.apache.fop.events.EventListener;
+import org.apache.fop.events.model.EventSeverity;
+
+/**
+ * This class demonstrates how to register an event listener with FOP so you can customize
+ * FOP's error behaviour.
+ */
+public class ExampleEvents {
+
+    // configure fopFactory as desired
+    private FopFactory fopFactory = FopFactory.newInstance();
+
+    /**
+     * Converts an FO file to a PDF file using FOP
+     * @param fo the FO file
+     * @param pdf the target PDF file
+     * @throws IOException In case of an I/O problem
+     * @throws FOPException In case of a FOP problem
+     * @throws TransformerException In case of a problem with XSLT
+     */
+    public void convertFO2PDF(URL fo, File pdf)
+            throws IOException, FOPException, TransformerException {
+        
+        OutputStream out = null;
+        
+        try {
+            //Create the user agent for this processing run
+            FOUserAgent foUserAgent = fopFactory.newFOUserAgent();
+            
+            //Adding a simple logging listener that writes to stdout and stderr
+            foUserAgent.getEventBroadcaster().addEventListener(new SysOutEventListener());
+            
+            // Add your own event listener
+            foUserAgent.getEventBroadcaster().addEventListener(new MyEventListener());
+            
+            // configure foUserAgent further as desired
+    
+            // Setup output stream.  Note: Using BufferedOutputStream
+            // for performance reasons (helpful with FileOutputStreams).
+            out = new FileOutputStream(pdf);
+            out = new BufferedOutputStream(out);
+
+            // Construct fop with desired output format
+            Fop fop = fopFactory.newFop(MimeConstants.MIME_PDF, foUserAgent, out);
+
+            // Setup JAXP using identity transformer
+            TransformerFactory factory = TransformerFactory.newInstance();
+            Transformer transformer = factory.newTransformer(); // identity transformer
+            
+            // Setup input stream
+            Source src = new StreamSource(fo.toExternalForm());
+
+            // Resulting SAX events (the generated FO) must be piped through to FOP
+            Result res = new SAXResult(fop.getDefaultHandler());
+            
+            // Start XSLT transformation and FOP processing
+            transformer.transform(src, res);
+
+        } finally {
+            IOUtils.closeQuietly(out);
+        }
+    }
+
+    private static class MyEventListener implements EventListener {
+
+        public void processEvent(Event event) {
+            if ("org.apache.fop.events.ResourceEventProducer.imageNotFound"
+                    .equals(event.getEventID())) {
+                
+                //Get the FileNotFoundException that's part of the event's parameters
+                FileNotFoundException fnfe = (FileNotFoundException)event.getParam("fnfe");
+
+                System.out.println("---=== imageNotFound Event for " + event.getParam("uri")
+                        + "!!! ===---");
+                //Stop processing when an image could not be found. Otherwise, FOP would just
+                //continue without the image!
+                
+                System.out.println("Throwing a RuntimeException...");
+                throw new RuntimeException(EventFormatter.format(event), fnfe);
+            } else {
+                //ignore all other events
+            }
+        }
+        
+    }
+    
+    /** A simple event listener that writes the events to stdout and sterr. */
+    private static class SysOutEventListener implements EventListener {
+
+        /** {@inheritDoc} */
+        public void processEvent(Event event) {
+            String msg = EventFormatter.format(event);
+            EventSeverity severity = event.getSeverity();
+            if (severity == EventSeverity.INFO) {
+                System.out.println("[INFO ] " + msg);
+            } else if (severity == EventSeverity.WARN) {
+                System.out.println("[WARN ] " + msg);
+            } else if (severity == EventSeverity.ERROR) {
+                System.err.println("[ERROR] " + msg);
+            } else if (severity == EventSeverity.FATAL) {
+                System.err.println("[FATAL] " + msg);
+            } else {
+                assert false;
+            }
+        }
+    }
+    
+
+    /**
+     * This method extracts the original exception from some exception. The exception
+     * might be nested multiple levels deep.
+     * @param t the Throwable to inspect
+     * @return the original Throwable or the method parameter t if there are no nested Throwables.
+     */
+    private static Throwable getOriginalThrowable(Throwable t) {
+        if (t instanceof SAXException) {
+            SAXException saxe = (SAXException)t;
+            if (saxe.getException() != null) {
+                return getOriginalThrowable(saxe.getException());
+            } else {
+                return saxe;
+            }
+        } else {
+            if (t.getCause() != null) {
+                return getOriginalThrowable(t.getCause());
+            } else {
+                return t;
+            }
+        }
+    }
+
+    /**
+     * Main method.
+     * @param args command-line arguments
+     */
+    public static void main(String[] args) {
+        try {
+            System.out.println("FOP ExampleEvents\n");
+            System.out.println("Preparing...");
+            
+            //Setup directories
+            File baseDir = new File(".");
+            File outDir = new File(baseDir, "out");
+            outDir.mkdirs();
+
+            //Setup input and output files
+            URL fo = ExampleEvents.class.getResource("missing-image.fo");
+            File pdffile = new File(outDir, "out.pdf");
+
+            System.out.println("Input: XSL-FO (" + fo.toExternalForm() + ")");
+            System.out.println("Output: PDF (" + pdffile + ")");
+            System.out.println();
+            System.out.println("Transforming...");
+            
+            ExampleEvents app = new ExampleEvents();
+            
+            try {
+                app.convertFO2PDF(fo, pdffile);
+            } catch (TransformerException te) {
+                //Note: We don't get the original exception here!
+                //FOP needs to embed the exception in a SAXException and the TraX transformer
+                //again wraps the SAXException in a TransformerException. Even our own
+                //RuntimeException just wraps the original FileNotFoundException.
+                //So we need to unpack to get the original exception (about three layers deep).
+                Throwable originalThrowable = getOriginalThrowable(te);
+                originalThrowable.printStackTrace(System.err);
+                System.out.println("Aborted!");
+                System.exit(-1);
+            }
+            
+            System.out.println("Success!");
+        } catch (Exception e) {
+            //Some other error (shouldn't happen in this example)
+            e.printStackTrace(System.err);
+            System.exit(-1);
+        }
+    }
+
+}
diff --git a/examples/embedding/java/embedding/events/missing-image.fo b/examples/embedding/java/embedding/events/missing-image.fo
new file mode 100644
index 000000000..2c55f66ce
--- /dev/null
+++ b/examples/embedding/java/embedding/events/missing-image.fo
@@ -0,0 +1,33 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  Licensed to the Apache Software Foundation (ASF) under one or more
+  contributor license agreements.  See the NOTICE file distributed with
+  this work for additional information regarding copyright ownership.
+  The ASF licenses this file to You under the Apache License, Version 2.0
+  (the "License"); you may not use this file except in compliance with
+  the License.  You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+-->
+<!-- $Id$ -->
+<fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format">
+  <fo:layout-master-set>
+    <fo:simple-page-master master-name="A4" page-height="29.7cm" page-width="21cm" margin="2cm">
+      <fo:region-body/>
+    </fo:simple-page-master>
+  </fo:layout-master-set>
+  <fo:page-sequence master-reference="A4">
+    <fo:flow flow-name="xsl-region-body">
+      <fo:block>
+        The following image is not available:
+        <fo:external-graphic src="my-missing-image.png"/>
+      </fo:block>
+    </fo:flow>
+  </fo:page-sequence>
+</fo:root>