PERICLES change management ontology Decision Support Early Warning Internet of Things LRM Linked Resource Model Sensors Somoclu dependency digital preservation semantic change semantic drift Chronic Lymphocytic Leukemia Crisis Management DBpedia Data Aggregation Data Integration Digital Ecosystem Model Entity Registry Model Repository Knowledge Base LTDP Model-based approach Model-driven preservation OAIS OWL Ontologies Ontology Ontology Population Ontology Visualization PERICLES Extraction Tool PERICLES integration framework PROPheT Protégé Reasoning SemaDrift Semantic Modelling Significant Environment Information Visualization appraisal concept drift conceptual haptograms content dynamics deafblind communication digital media domain digital video art evolving semantics gene-ontology gravitational model