Oops, hit the wrong button before finishing....

Quoting "J. McRee Elrod" <[log in to unmask]>:


> One difficulty with two letter subfield codes would be telling the
> difference between a two letter code, and a one latter code followed
> by a lower case data element, e.g., "e-Book".  A one letter code with
> punctuation might work better, e.g., 245 =$b and :$b.

The way ISO 2709 works, all subfield codes must be of the same length,  
so you couldn't mix 1-character and 2-character codes in the same  
record. You know what the length of the subfield code is because that  
is in the Leader (even though most systems today ignore it since so  
far all implementations use one-character codes).

kc


-- 
Karen Coyle
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