Preservation of interactive multimedia performances is becoming important as they are getting more and more popular in performing arts communities. A proper preservation does not only require keeping all the necessary components available at the time of reconstruction but also the knowledge about these components are assembled together for in performance. In digital preservation, metadata has been seen as a mean of enabling semantic processing, cataloguing and querying on preserved digital objects. However, as a record based approach, metadata is weak at describing interrelationships between digital objects in digital archives, which is one of the key requirements for preservation of interactive multimedia performances. In this paper, a domain ontology for describing the complex relationships amongst different components of a performance to support its preservation process is introduced.