If you are not very familiar with Qt, C++, and Python, you simply will not be able to accomplish this. Furthermore, an FOAF ontology of characters in a novel would be a writer's tool and not an epub editing tool. Sigil is not for authoring books. It is for editing epubs. There is really no chance we would ever integrate it into Sigil.
I strongly recommend you look at OpenOffice or LibreOffice as a better platform for a tool like what you want.
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