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https://issues.apache.org/jira/browse/PDFBOX-5198?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17352636#comment-17352636
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Matthew Jung commented on PDFBOX-5198:
--------------------------------------

HI TimI send you a merged PDF built using adobe.. Sorry I had to email it from 
my company and they discourage send email to our home addressMatt
    On Thursday, May 27, 2021, 01:11:11 PM EDT, Tilman Hausherr (Jira) 
<[email protected]> wrote:  
 
 
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https://issues.apache.org/jira/browse/PDFBOX-5198?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17352631#comment-17352631
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Tilman Hausherr commented on PDFBOX-5198:
-----------------------------------------

I'd like to get the PDF merged by Adobe. But considering that I've mentioned 
this many times and haven't received it, I guess I won't. I'm pretty confident 
that my change is good: one of your screenshots shows several /Document on the 
same level, which is what I also did. The PDF specification allows that the top 
/K entry is an array. I suspect that in the "It still appears to be nested and 
not level" you got the wrong file because it's definitively not nested. So I'll 
commit this change on the weekend.




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> When merging multiple pdf ua documents, Tags become nested
> ----------------------------------------------------------
>
>                 Key: PDFBOX-5198
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-5198
>             Project: PDFBox
>          Issue Type: Wish
>    Affects Versions: 2.0.21
>            Reporter: Matthew Jung
>            Priority: Major
>         Attachments: 1622000586495blob.jpg, 1622120149457blob.jpg, 
> 1622120149457blob.jpg, 1622123253165blob.jpg, 1622123790854blob.jpg, 
> PDFA3A-merged-new.pdf, PDFUA-in-a-Nutshell-PDFUA_1.pdf, 
> nested_tags_4documents_merged_using_pdfbox.tif, 
> non_nested_tags_4documents_combined_using+adobe_pro.tif, screenshot-1.png
>
>
> When merging PDF UA documents the tags seen in Adobe reader are nested. If 
> merging 200 documents then the tags are 200 nested deep. It does not appear 
> to affect that JAWS reader can still read the document  but it may slow down 
> performance when loading to a content repository.
> <DOCUMENT>
>           <DOCUMENT>
>                        <DOCUMENT>
> when using Adobe DC to merge multiple documents the tags are flatten
> <DOCUMENT>
>      <DOCUMENT>
>       <DOCUMENT>
>       <DOCUMENT>
>  



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