Establishing relationships between one or more entities of a first application and one or more entities of a second application using metadata. At least one entity of the second application is identified for establishing a relationship with at least one entity of the first application. Metadata from the second application is received at the first application. The metadata includes information associated with the identified entity of the second application. An expression is generated, based on the metadata, specifying a relationship between the entity of the first application with the identified entity of the second application.