This is worrying - I can't reproduce this as you describe (the auto-link works fine and is not wrapped in <nowiki>s). Can you give more details? Did you save the page - if so, do you have the diff link? What browser were you using?

http://en.wikipedia.org/w/index.php?title=Siemens_%28unit%29&diff=prev&oldid=563930491

Firefox 22.0
Windows 7 Home Premium SP1 64-bit
Dell Inspiron 660
Intel Core i3-2120

(In reply to comment #2)

http://en.wikipedia.org/w/index.
php?title=Siemens_%28unit%29&diff=prev&oldid=563930491

Firefox 22.0
Windows 7 Home Premium SP1 64-bit
Dell Inspiron 660
Intel Core i3-2120

Aha - did you type in "Applications of Environmental Aquatic Chemistry: A Practical Guide" and then make it italics, or did you try to use wikitext to
do this, typing in "''Applications of Environmental Aquatic Chemistry: A Practical Guide''"?

If the latter, I think this bug can be simplified to "ISBN 1234567890 should be spotted when avoiding overly-keen <nowiki>ing - is that correct?

That seems to about sum it up. As I said in my initial post, the bold and italics not rendering are probably my own fault.

(In reply to comment #4)

That seems to about sum it up. As I said in my initial post, the bold and
italics not rendering are probably my own fault.

OK, retitling. :-)

Is it correct to summarize this as a bug in the serializer where ISBN text is not being nowikied?

[subbu@earth lib] echo "<p>ISBN 1234567890</p>" | node parse --html2wt
ISBN 1234567890

whereas the expected output should have been:
<nowiki>ISBN 1234567890</nowiki>