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Re: [ddlm-group] The Grazulis eliding proposal: how to incorporateinto CIF?

Dear Colleagues,

   I am sorry that my position was misunderstood.  For CIF2, my vote
is no on this proposal.


  Herbert J. Bernstein, Professor of Computer Science
    Dowling College, Kramer Science Center, KSC 121
         Idle Hour Blvd, Oakdale, NY, 11769


On Tue, 28 Jun 2011, James Hester wrote:

> Dear DDLm group,
> As none of you have raised any substantial objections to the Grazulis
> eliding proposal, I think we can consider it accepted. The question now
> arises as to how it will fit into the CIF framework.  I see the following
> possibilities:
> (1) As a required protocol for all CIF semicolon-delimited text strings
> (must be recognised by CIF readers)
> (2) As an available protocol for all CIF semicolon-delimited text strings
> (may not be recognised by all CIF readers)
> (3) As a string type defined in DDLm for use in domain dictionary
> definitions (only needs to be recognised by domain-specific software)
> Under option (1), the "official" value of a given semicolon-delimited string
> would be unambiguously that which results from decoding the protocol.  Under
> option (2) there would be two "official" values: the undecoded value and the
> decoded value, either of which would be acceptable output for a conformant
> parser; under option (3) the dictionary determines how to process the string
> (identically to interpreting e.g. LaTeX strings today).  Under option (3)
> the "official" value from a CIF parser would be the undecoded value, and the
> "official" value after application of the dictionary definition would be the
> decoded value.
> My comments:
> Option (3) has the formal effect of requiring that either the type of string
> delimiter is carried forward to the dictionary layer, so that triple-quote
> delimited strings are not inadvertently "decoded", or else that the protocol
> is applied uniformly across all multi-line string constructs for that
> particular dictionary type.
> Option (2) insofar as it involves optional behaviour essentially sidelines
> the proposal, as CIF writers cannot count on it being understood at the
> reading end and so cannot use it to encode important information
> Option (1) imposes extra burdens on CIF parser writers, although as Saulius
> notes it is not particularly difficult to implement.
> My preference is either (1) or (3), perhaps inclining towards (3) in order
> to shift complexity to the dictionary level.  If the protocol is seen to be
> generally useful, it would be reasonable to prefer (1).
> --
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