Index: src/main/java/org/apache/camel/maven/EmbeddedMojo.java
===================================================================
--- src/main/java/org/apache/camel/maven/EmbeddedMojo.java	(revision 643008)
+++ src/main/java/org/apache/camel/maven/EmbeddedMojo.java	(working copy)
@@ -22,6 +22,7 @@
 import java.net.MalformedURLException;
 import java.net.URL;
 import java.net.URLClassLoader;
+import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 
@@ -61,6 +62,13 @@
      */
     protected boolean dotEnabled;
     /**
+     * Allows the routes from multiple contexts to be aggregated into one DOT file (in addition to the individual files) 
+     *
+     * @parameter expression="false"
+     * @readonly
+     */
+    protected boolean dotAggregationEnabled;
+    /**
      * Project classpath.
      *
      * @parameter expression="${project.testClasspathElements}"
@@ -158,13 +166,27 @@
     }
 
     protected String[] createArguments() {
-        if (dotEnabled) {
-            return new String[] {"-duration", duration, "-outdir", outputDirectory};
-        } else {
-            return new String[] {"-duration", duration};
+
+        ArrayList<String> args = new ArrayList<String>( 5 );
+        if (isDotEnabled()) {
+
+            args.add( "-outdir" );
+            args.add( getOutputDirectory() );
+        }
+
+        if (isDotAggregationEnabled()) {
+
+            args.add( "-aggregate-dot" );
+            args.add( "true" );
         }
+
+        args.add( "-duration" );
+        args.add( getDuration() );
+
+        return (String[]) args.toArray( new String[0] );
     }
 
+
     protected ClassLoader createClassLoader(ClassLoader parent) throws MalformedURLException {
         getLog().debug("Using classpath: " + classpathElements);
 
@@ -179,4 +201,14 @@
         URLClassLoader loader = new URLClassLoader(urls, parent);
         return loader;
     }
+
+    public boolean isDotAggregationEnabled() {
+
+        return dotAggregationEnabled;
+    }
+
+    public void setDotAggregationEnabled( boolean dotAggregationEnabled ) {
+
+        this.dotAggregationEnabled = dotAggregationEnabled;
+    }
 }
Index: src/main/java/org/apache/camel/maven/DotMojo.java
===================================================================
--- src/main/java/org/apache/camel/maven/DotMojo.java	(revision 643008)
+++ src/main/java/org/apache/camel/maven/DotMojo.java	(working copy)
@@ -113,6 +113,13 @@
      */
     private File outputDirectory;
     /**
+     * In the case of multiple camel contexts, setting aggregate == true will aggregate all 
+     *  into a monolithic context, otherwise they will be processed independently.
+     *
+     * @parameter
+     */
+    private String aggregate;
+    /**
      * GraphViz executable location; visualization (images) will be
      * generated only if you install this program and set this property to the
      * executable dot (dot.exe on Win).
@@ -204,12 +211,13 @@
      * @param locale    report locale.
      * @throws MojoExecutionException if there were any execution errors.
      */
-    protected void execute(final File outputDir, final Locale locale) throws MojoExecutionException {
+    protected void execute( final File outputDir, final Locale locale ) throws MojoExecutionException {
+
         try {
-            runCamelEmbedded(outputDir);
+            runCamelEmbedded( outputDir );
         }
         catch (DependencyResolutionRequiredException e) {
-            throw new MojoExecutionException("Failed: " + e, e);
+            throw new MojoExecutionException( "Failed: " + e, e );
         }
         outputDir.mkdirs();
 
@@ -214,7 +222,7 @@
         outputDir.mkdirs();
 
         List<File> files = new ArrayList<File>();
-        appendFiles(files, outputDirectory);
+        appendFiles( files, outputDirectory );
 
         if (graphvizOutputTypes == null) {
             if (graphvizOutputType == null) {
@@ -221,7 +229,7 @@
                 graphvizOutputTypes = DEFAULT_GRAPHVIZ_OUTPUT_TYPES;
             }
             else {
-                graphvizOutputTypes = new String[]{graphvizOutputType};
+                graphvizOutputTypes = new String[] { graphvizOutputType };
             }
         }
         try {
@@ -228,13 +236,13 @@
             Set<String> contextNames = new HashSet<String>();
             for (File file : files) {
                 String contextName = file.getParentFile().getName();
-                contextNames.add(contextName);
+                contextNames.add( contextName );
             }
+
             boolean multipleCamelContexts = contextNames.size() > 1;
 
             for (int i = 0, size = files.size(); i < size; i++) {
-                File file = files.get(i);
-
+                File file = files.get( i );
                 String contextName = null;
                 if (multipleCamelContexts) {
                     contextName = file.getParentFile().getName();
@@ -239,33 +247,10 @@
                 if (multipleCamelContexts) {
                     contextName = file.getParentFile().getName();
                 }
-                StringWriter buffer = new StringWriter();
-                PrintWriter out = new PrintWriter(buffer);
-                printHtmlHeader(out, contextName);
-                printHtmlFileHeader(out, file);
-                for (int j = 0; j < graphvizOutputTypes.length; j++) {
-                    String format = graphvizOutputTypes[j];
-                    String generated = convertFile(file, format);
 
-                    if (generated != null && format.equals("cmapx")) {
-                        // lets include the generated file inside the html
-                        addFileToBuffer(out, new File(generated));
-                    }
-                }
-                printHtmlFileFooter(out, file);
-                printHtmlFooter(out);
+                getLog().info( "Generating contextName: " + contextName + " file: " + file + "" );
 
-                String content = buffer.toString();
-                String name = file.getName();
-                if (name.equalsIgnoreCase("routes.dot") || i == 0) {
-                    indexHtmlContent = content;
-                }
-                int idx = name.lastIndexOf(".");
-                if (idx >= 0) {
-                    name = name.substring(0, idx);
-                    name += ".html";
-                }
-                writeIndexHtmlFile(file.getParentFile(), name, content);
+                generate( i, file, contextName );
             }
 
             if (multipleCamelContexts) {
@@ -272,20 +257,20 @@
                 // lets generate an index page which lists each indiviual
                 // CamelContext file
                 StringWriter buffer = new StringWriter();
-                PrintWriter out = new PrintWriter(buffer);
+                PrintWriter out = new PrintWriter( buffer );
 
-                out.println("<h1>Camel Contexts</h1>");
+                out.println( "<h1>Camel Contexts</h1>" );
                 out.println();
 
-                out.println("<ul>");
+                out.println( "<ul>" );
                 for (String contextName : contextNames) {
-                    out.print("  <li><a href='");
-                    out.print(contextName);
-                    out.print("/routes.html'>");
-                    out.print(contextName);
-                    out.println("</a></li>");
+                    out.print( "  <li><a href='" );
+                    out.print( contextName );
+                    out.print( "/routes.html'>" );
+                    out.print( contextName );
+                    out.println( "</a></li>" );
                 }
-                out.println("</ul>");
+                out.println( "</ul>" );
                 indexHtmlContent = buffer.toString();
             }
         }
@@ -290,13 +275,44 @@
             }
         }
         catch (CommandLineException e) {
-            throw new MojoExecutionException("Failed: " + e, e);
+            throw new MojoExecutionException( "Failed: " + e, e );
         }
         catch (IOException e) {
-            throw new MojoExecutionException("Failed: " + e, e);
+            throw new MojoExecutionException( "Failed: " + e, e );
         }
     }
 
+    private void generate( int index, File file, String contextName ) throws CommandLineException, MojoExecutionException, IOException {
+
+        StringWriter buffer = new StringWriter();
+        PrintWriter out = new PrintWriter( buffer );
+        printHtmlHeader( out, contextName );
+        printHtmlFileHeader( out, file );
+        for (int j = 0; j < graphvizOutputTypes.length; j++) {
+            String format = graphvizOutputTypes[j];
+            String generated = convertFile( file, format );
+
+            if (format.equals( "cmapx" ) && generated != null) {
+                // lets include the generated file inside the html
+                addFileToBuffer( out, new File( generated ) );
+            }
+        }
+        printHtmlFileFooter( out, file );
+        printHtmlFooter( out );
+
+        String content = buffer.toString();
+        String name = file.getName();
+        if (name.equalsIgnoreCase( "routes.dot" ) || index == 0) {
+            indexHtmlContent = content;
+        }
+        int idx = name.lastIndexOf( "." );
+        if (idx >= 0) {
+            name = name.substring( 0, idx );
+            name += ".html";
+        }
+        writeIndexHtmlFile( file.getParentFile(), name, content );
+    }
+    
     protected void runCamelEmbedded(File outputDir) throws DependencyResolutionRequiredException {
         if (runCamel) {
             getLog().info("Running Camel embedded to load META-INF/spring/*.xml files");
@@ -307,6 +323,10 @@
             EmbeddedMojo mojo = new EmbeddedMojo();
             mojo.setClasspathElements(list);
             mojo.setDotEnabled(true);
+            if ("true".equals( getAggregate() )) {
+
+                mojo.setDotAggregationEnabled( true );
+            }            
             mojo.setOutputDirectory(outputDirectory.getAbsolutePath());
             mojo.setDuration(duration);
             mojo.setLog(getLog());
@@ -499,4 +519,14 @@
     protected MavenProject getProject() {
         return this.project;
     }
+    
+    public String getAggregate() {
+
+        return aggregate;
+    }
+
+    public void setAggregate( String aggregate ) {
+
+        this.aggregate = aggregate;
+    }
 }