There are many possible project ontologies that you can build with Kili Technology. The specific one you'll be using for text annotation will depend on the task you're trying to accomplish. Your ontology designed for a simple classification task will probably be quite similar to the one built for classifying images. Though if your project involves adding specific labeling jobs designed for working with textual data, like named entity recognition, marking relations between text entities, text transcription, or OCR, your ontology will be very different.