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https://issues.apache.org/jira/browse/PDFBOX-1386?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14175577#comment-14175577
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Maruan Sahyoun commented on PDFBOX-1386:
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Could you elaborate a little what’s missing in the current implementation and 
which uses cases can’t be addressed (OCGs are not an area I’m using). Also I 
see that e.g. DTPDOptionalContentGroup extends PDOptionalContentGroup. Couldn’t 
that be handled by providing a patch to PDOptionalContentGroup?

> Proposal for classes to handle optional contents
> ------------------------------------------------
>
>                 Key: PDFBOX-1386
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-1386
>             Project: PDFBox
>          Issue Type: New Feature
>          Components: PDModel
>            Reporter: Dominic Tubach
>            Priority: Minor
>         Attachments: DTCOSName.java, DTPDContentUsageDictionary.java, 
> DTPDContentUsageDictionaryTest.java, DTPDOptionalContentConfiguration.java, 
> DTPDOptionalContentConfigurationTest.java, DTPDOptionalContentGroup.java, 
> DTPDOptionalContentGroupTest.java, 
> DTPDOptionalContentMembershipDictionary.java, 
> DTPDOptionalContentMembershipDictionaryTest.java, 
> DTPDOptionalContentProperties.java, DTPDOptionalContentPropertiesTest.java, 
> DTPDUsageApplicationDictionary.java, DTPDUsageApplicationDictionaryTest.java
>
>
> Attached are classes as proposal to handle optional contents.
> It requires the classes in the issues #PDFBOX-1383 and #PDFBOX-1385
> It requires Java 1.6 (It might be enough to remove the @Override annotations 
> for Java 1.5 compatibility.) 



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