On Fri, May 21, 2010 at 11:25 AM, Mark Lively <[log in to unmask]> wrote:
> Yes, because you are stringing together text items.  Normally the text item delimiters are {""} so when you concatenate two
> strings together there is nothing between them.

No.  When you *concatenate* two strings together (with the &
operator), there is nothing between them, period:

set text item delimiters to ":"
"foo" & "bar"
-- returns "foobar"

The TIDs only come in when you coerce a list to text:

{"foo","bar"} as string
-- returns "foo:bar"

The thing that is confusing with the OP's example is that & is
overloaded.  When you apply it to things that aren't strings, like
folders and files, it creates a list:

POSIX file "/" & POSIX file "/bin"
-- creates the list { file "Macintosh HD:", file "Macintosh HD:bin: }

Converting such a list to a string is thus an example of the second
case instead of the first, even though '&' is involved, so the TIDs
are inserted.

-- 
Mark J. Reed <[log in to unmask]>