word alignment ex in tutorial

doc/tutorial/gf-tutorial.html

@@ -1119,11 +1119,11 @@ Human eye may prefer to see a visualization: <CODE>visualize_tree = vt</CODE>:
 </PRE>
 <P>
 The tree is generated in postscript (<CODE>.ps</CODE>) file. The <CODE>-view</CODE> option is used for
-telling what command to use to view the file. Its default is <CODE>"gv"</CODE>, which works
-on most Linux installations. On a Mac, one would probably write
+telling what command to use to view the file. Its default is <CODE>"open"</CODE>, which works
+on Mac OS X. On Ubuntu Linux, one can write
 </P>
 <PRE>
-    &gt; parse "this delicious cheese is very Italian" | visualize_tree -view="open"
+    &gt; parse "this delicious cheese is very Italian" | visualize_tree -view="eog"
 </PRE>
 <P></P>
 <P>
@@ -1240,6 +1240,19 @@ are put before the noun. This distinction can be controlled by parameters,
 which are introduced in <a href="#chaptwo">Lesson 3</a>.)
 </P>
 <P>
+Multilingual grammars have yet another visualization option:
+<B>word alignment</B>, which shows what words correspond to each other.
+Technically, this means words that have the same smallest spanning subtrees
+in abstract syntax. The command is <CODE>align_words = aw</CODE>:
+</P>
+<PRE>
+    &gt; parse "this delicious cheese is very Italian" | align_words
+</PRE>
+<P></P>
+<P>
+<IMG ALIGN="middle" SRC="align2.png" BORDER="0" ALT="">
+</P>
+<P>
 <!-- NEW -->
 </P>
 <A NAME="toc29"></A>

doc/tutorial/gf-tutorial.t2t

@@ -1263,14 +1263,15 @@ Human eye may prefer to see a visualization: ``visualize_tree = vt``:
   > parse "this delicious cheese is very Italian" | visualize_tree
 ```
 The tree is generated in postscript (``.ps``) file. The ``-view`` option is used for
-telling what command to use to view the file. Its default is ``"gv"``, which works
-on most Linux installations. On a Mac, one would probably write
+telling what command to use to view the file. Its default is ``"open"``, which works
+on Mac OS X. On Ubuntu Linux, one can write
 ``` 
-  > parse "this delicious cheese is very Italian" | visualize_tree -view="open"
+  > parse "this delicious cheese is very Italian" | visualize_tree -view="eog"
 ```
 
 
 
+
 #MYTREE
 
 This command uses the program [Graphviz http://www.graphviz.org/], which you
@@ -1365,6 +1366,17 @@ Thus Italian says ``vino italiano`` for ``Italian wine``.
 are put before the noun. This distinction can be controlled by parameters, 
 which are introduced in #Rchapfour.)
 
+Multilingual grammars have yet another visualization option:
+**word alignment**, which shows what words correspond to each other.
+Technically, this means words that have the same smallest spanning subtrees
+in abstract syntax. The command is ``align_words = aw``:
+``` 
+  > parse "this delicious cheese is very Italian" | align_words
+```
+
+[align2.png]
+
+
 #NEW
 
 ===Exercises on multilinguality===