[DFDL-WG] Review/Feedback wanted on proposal: Data Streaming for base64 and other Layered Transformations

[Mike Beckerle]

On looking into implementation complexity I've come up with simplifications
that don't reduce expressive power at all, but massively simplify
implementation (and documentation, and testing...) burdens for this
proposed feature.


https://cwiki.apache.org/confluence/display/DAFFODIL/Proposal%3A+Data+Layering+for+base64+-+Simplified

Feedback is very welcome.

Mike Beckerle | OGF DFDL Workgroup Co-Chair | Tresys Technology |
www.tresys.com
Please note: Contributions to the DFDL Workgroup's email discussions are
subject to the OGF Intellectual Property Policy
<http://www.ogf.org/About/abt_policies.php>


On Thu, Feb 15, 2018 at 10:44 AM, Mike Beckerle <mbeckerle.dfdl at gmail.com>
wrote:

> We have a great deal of demand for the ability to describe data formats
> that include layered transformations - that is, regions within the data
> that need to be algorithmically transformed before parsing and after
> unparsing.
>
> The IETF data formats make extensive use of line folding, base64, etc.
> Many formats allow compressed payloads. All these are examples of
> "layering" where a region of the data stream can be identified,
> algorithmically transformed, and then subsequently further parsed. (The
> inverse process for unparsing obviously.)
>
> Our draft proposal, that we are hoping to implement in Daffodil, is here:
>
> https://cwiki.apache.org/confluence/display/DAFFODIL/
> Proposal%3A+Data+Streaming+for+Base64+and+other+Layered+Transformations
>
> Any feedback on this is very welcome, and can be addressed to dfdl-wg
> mailing list.
>
> Mike Beckerle | OGF DFDL Workgroup Co-Chair | Tresys Technology |
> www.tresys.com
> Please note: Contributions to the DFDL Workgroup's email discussions are
> subject to the OGF Intellectual Property Policy
> <http://www.ogf.org/About/abt_policies.php>
>
>
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