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https://issues.apache.org/jira/browse/PDFBOX-3323?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15251827#comment-15251827
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Alexander Kriegisch commented on PDFBOX-3323:
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It is really inconvenient that there is no high level API for XMP. I see sample
code on your web page for reading metadata from a document or for setting them
in an existing document, but before the merge I do not have any document, only
input streams to be consumed by the merger. I also cannot seem to create a
{{'COSStream}} based on a raw stream, byte array or string, so it is next to
impossible to provide the right data for the setter method call.
> Cannot set destination meta data in PDFMergerUtility
> ----------------------------------------------------
>
> Key: PDFBOX-3323
> URL: https://issues.apache.org/jira/browse/PDFBOX-3323
> Project: PDFBox
> Issue Type: Improvement
> Affects Versions: 1.8.9, 2.0.0
> Reporter: Alexander Kriegisch
> Labels: merge, metadata
>
> When merging multiple PDFs into one compound document via
> {{PDFMergerUtility}}, meta data like title, author, subject cannot be set but
> seem to be taken from one of the input documents. This is usually not the
> desired behaviour because as a user I have no direct influence on the meta
> data. As a user I would like to explicitly set or at least overwrite certain
> meta data for the destination document. Currently I can only set the
> destination stream or file name, but not the meta data.
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