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Posted to commits@daffodil.apache.org by "Mike Beckerle (Jira)" <ji...@apache.org> on 2022/03/25 15:38:00 UTC

[jira] [Commented] (DAFFODIL-2615) group sharing causes obscure unparser runtime error

    [ https://issues.apache.org/jira/browse/DAFFODIL-2615?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17512446#comment-17512446 ] 

Mike Beckerle commented on DAFFODIL-2615:
-----------------------------------------

Added to 3.4.0 release target because many DFDL schema projects are having to work around this by duplicating (and therefore not sharing) what would otherwise be shared groups. 

> group sharing causes obscure unparser runtime error
> ---------------------------------------------------
>
>                 Key: DAFFODIL-2615
>                 URL: https://issues.apache.org/jira/browse/DAFFODIL-2615
>             Project: Daffodil
>          Issue Type: Bug
>          Components: Back End, Middle &quot;End&quot;
>    Affects Versions: 2.7.0, 3.2.1
>            Reporter: Mike Beckerle
>            Priority: Major
>             Fix For: 3.4.0
>
>
>  
> While working on a large  DFDL schema, ran into a problem where a group is being shared in 2 places.
> I get an obsure message at unparse time like this:
> "Unparser needed event for {}nackHeader but got (invalid) {}nackHeader"
> This element nackHeader is the element that appears immediately after *one* of the shared group references. The other one works fine. 
> Making a copy of the shared group so that it is no longer shared eliminates the problem and is the workaround. 
> I will endeavor to create a simplified scenario to reproduce. 



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