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https://issues.apache.org/jira/browse/PDFBOX-4970?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17206646#comment-17206646
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Andreas Lehmkühler commented on PDFBOX-4970:
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Do you have a sample pdf, or why do you ask?

> Possibility to detect duplicate ids in a revision
> -------------------------------------------------
>
>                 Key: PDFBOX-4970
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-4970
>             Project: PDFBox
>          Issue Type: Improvement
>            Reporter: Pierrick Vandenbroucke
>            Priority: Major
>
> We are trying to detect files which contain several objects with the same 
> identifier within a revision or in a given PDF. Currently, that seems not 
> possible. We are facing to this 
> [map|https://github.com/apache/pdfbox/blob/2.0.21/pdfbox/src/main/java/org/apache/pdfbox/cos/COSDocument.java#L56]
>  which only allows one instance by object id. The map usage brings 
> limitations (eg : rendering,...).
> Is that possible to detect such files ?



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