Although the ontology evolution plays a key role in the Semantic Web, methods and tools to support it are missing. Thus, this paper proposes a component-based framework for managing ontology changes. The main functionalities of the OntoAnalyzer framework are: (1) to track changes and to formalize them using a language that we propose for representing ontology changes and (2) to identify changes a posteriori to ontology evolution and to analyze their effect on the ontology-based annotation of resources.