Aloha all, The following org file demonstrates that :noweb passes silently over the undefined code block <>. As my org-babel files become more complex, it is harder for me to catch errors like this on my own (e.g., when I have a typo in a reference to a srcname). Could org-babel raise a warning or an error in this circumstance? All the best, Tom --------------------------------- * noweb #+begin_src R :noweb :session noweb <> <> #+end_src #+resname: : 2 #+srcname: bar #+begin_src R 2 #+end_src --------------------------------- Thomas S. Dye, Ph.D. T. S. Dye & Colleagues, Archaeologists, Inc. Phone: (808) 529-0866 Fax: (808) 529-0884 http://www.tsdye.com