word alignment ex in tutorial

1 files changed, 15 insertions, 3 deletions

diff --git a/doc/tutorial/gf-tutorial.t2t b/doc/tutorial/gf-tutorial.t2t
index d0a298e4c..0b02f479f 100644
--- a/doc/tutorial/gf-tutorial.t2t
+++ b/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===