[DFDL-WG] DFDL bidirectional support v3

[Alan Powell]

Attached is the updated bidirectional proposal.

The main changes are:

1. Removal of bidi properties associated with syntax (initiator, 
terminator, separator). Bidirectional strings can be specified for 
initiator, etc but these are not transformed when the string is converted 
to the instance code page. That is, order of the characters in the 
initiator must  match the order expected in the instance data.

2. Removed bidi properties from the infoset.  Stings in the infoset are in 
unicode which requires logical LTR. On parsing characters are converted to 
unicode code points without transformation.

3. Kept textBiDiTextShape to cover the case when parsing from a code page 
that does not have separate code points for each shape and unparsing to a 
codepage that does have separate code points.



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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