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Posted to users@daffodil.apache.org by "Costello, Roger L." <co...@mitre.org> on 2019/06/03 15:40:24 UTC

Are DFDL expressions evil?

Hello DFDL community,

Today Mike Beckerle wrote:


  *   I think expressions for delimiters should be avoided if possible.

Why is that?

Are all DFDL expressions to be avoided if possible? Wouldn't that eliminate dynamic computation/parsing?

/Roger

Re: Are DFDL expressions evil?

Posted by "Beckerle, Mike" <mb...@tresys.com>.

Expressions are not evil.


On the contrary, they're essential to many things in DFDL. They are a major thing that make DFDL more powerful, especially when unparsing, to existing technology for "ETL" and data integration.


It's simply a matter of doing things in a more simple manner when possible. From a portability perspective things that avoid using expressions are more likely to be portable to other DFDL impementations, which do not fully implement the DFDL function library, for example.



________________________________
From: Costello, Roger L. <co...@mitre.org>
Sent: Monday, June 3, 2019 11:40:24 AM
To: users@daffodil.apache.org
Subject: Are DFDL expressions evil?


Hello DFDL community,



Today Mike Beckerle wrote:



  *   I think expressions for delimiters should be avoided if possible.



Why is that?



Are all DFDL expressions to be avoided if possible? Wouldn’t that eliminate dynamic computation/parsing?



/Roger