Ontology transformation enables us to modify ontology or its part. Transformation can be defined with transformation patterns. These transformation patterns consist of a source ontology pattern (OP1), a target ontology pattern (OP2) and a transformation specification between entities of those two ontology patterns (aka pattern transformation).
Historically, first publication has been poster at ESWC-2009 . Subsequently, in  we envisioned an ontology transformation service where transformation patterns where closely bound with alignment patterns. Recently, in  we presented ontology transformation framework based on OPPL and OWL-API.
Next, transformation patterns are defined more formally. You can skip over those definitions and directly follow the example in Section 4.