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https://issues.apache.org/jira/browse/DAFFODIL-2221?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Steve Lawrence updated DAFFODIL-2221:
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Fix Version/s: (was: 3.0.0)
> Ability to compute CRC, checksums, parity fields. - related to layering?
> ------------------------------------------------------------------------
>
> Key: DAFFODIL-2221
> URL: https://issues.apache.org/jira/browse/DAFFODIL-2221
> Project: Daffodil
> Issue Type: New Feature
> Components: DFDL Language, Front End
> Affects Versions: 2.4.0
> Reporter: Mike Beckerle
> Priority: Major
>
> A DFDL language extension has been requested allowing data to be validated,
> and unparsed that contains fields computed based on representation of other
> elements/groups. E.g., checksums, or CRC codes, or parity elements.
>
> Seems closely related to the layering features added to Daffodil as an
> experimental DFDL extension feature, and proposed for inclusion in DFDL v2.0
> version of the standard.
> But it's not exactly the same, as there needs to be a way to refer to the
> layer, and obtain a value from the layer when parsing and when unparsing.
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