[DFDL-WG] Simplified EscapeScheme proposal

[Alan Powell]

While working through the previous generalized proposal for escape schemes 
it became obvious that it was becoming overly complicated for what are 
believed to be a small number of escaping mechanisms. It had become 
particularly difficult to define the rules for when escaping should be 
used 'when needed'

The attached proposal is much simplified and covers just three variants of 
escaping mechanisms.

-       The use of a single escape character to cause the next character 
to be interpreted literally. The escape character itself is escaped by the 
escape escape character.
-       The use of a pair of escape strings to cause the enclosed group of 
characters to be interpreted literally. The ending escape string is 
escaped by an escape escape character.
-       The use of a pair of escape strings to cause the enclosed group of 
characters to be interpreted literally. An alternate pair of escape 
strings is used when the data contains the first ending escape string.

I have also introduced an extraEscapedCharacters property which is a list 
of additional single characters which must be escaped as a get out for 
other mechanisms





Alan Powell

 MP 211, IBM UK Labs, Hursley,  Winchester, SO21 2JN, England
 Notes Id: Alan Powell/UK/IBM     email: alan_powell at uk.ibm.com 
 Tel: +44 (0)1962 815073                  Fax: +44 (0)1962 816898






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