Issue
When using the GetKeywords() method on the IAdobeCoreMetaData interface to return the keywords in an InCopy document, I get an empty list back. InCopy displays these keywords fine in the UI, therefore, there must be some way to do it.

Solution

The way to do this is to get a text model for the InCopy document using the following code:

InterfacePtr<IPMUnknown> iUnknown(Utils<IInCopyWorkFlowUtils>()->QuerySelectedTextMetaDataBoss());

You will see from the IInCopyWorkFlowUtils.h file that the above method returns a text model interface as default even if there is no text selection.

From here you can simply call the following code to get the IAdobeCoreMetaData interface

InterfacePtr<IAdobeCoreMetaData> mMetaData(iUnknown, IAdobeCoreMetaData::kDefaultIID);

The next step is to call the GetKeywords() method on the IAdobeCoreMetaData interface to return the keywords for the InCopy document:

K2Vector<PMString> mKeywords = mMetaData->GetKeywords()

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