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Annotations in the eHumanities Desktop need to be open, extensible by users, and ontologically valid for all multimedia resources. In order to provide users with the corresponding flexibility in the display of their resources, whether of words, text, images or segments thereof, we developed the annotation system OWLnotator, based on the Web Ontology Language (OWL) [?]. The OWLnotator allows users to add valid OWL ontologies, which have been developed with an external editor, into the eHumanities Desktop and to link them to their resources. In this way, the user oversees the compilation of annotation models and manages the application of the model, even in the case of frequent or ongoing changes, without requiring programmatic adjustments. Because files of all media are treated fundamentally alike, which is a feature of the Desktop, the OWLnotator can be used for linguistic units, images, texts, videos, etc. In this way, users retain the possibility to display and annotate entire networks of intra- (text segment to image segment, image segment to image segment, etc.) and inter-aggregate (text-text,text-image,image-image) relations [?]. The functionality of the OWLnotator is furthermore coupled to the eHuBase, so users and working groups can specify exactly who is permitted to do what with which source data and annotation. Apache Jena [?] serves as the underlying database for the representation and processing of annotations.