Sub-graph interface generation

A specification including a description of a first directed graph (400) including a first plurality of components interconnected by a first set of one or more directed links is received. A graph interface (126) is formed for the first plurality of components including: forming a first interface element of the graph interface, the first interface element being associated with a first port of a first component of the first number of components, and configuring one or more properties of the first interface element such that the first port of the first component is consistent with the one or more properties of the first interface element. A first implementation (124) of the graph interface is formed including the first number of components, the forming including forming a first correspondence between the first interface element and the first port of the first component of the first number of components.