Data structures and related methods facilitate processing of media content for a user-defined development project. In one embodiment, a data structure comprises a chain identified field for holding identifiers for identifying chains of components that are to be employed in connection with the development project, a source identifier field for denoting a project source associated with a particular chain identifier, a project time field for denoting when, during project execution, an associated source chain is required, a source time field for denoting which portion of a source is required to support execution of the project for an associated entry in the project time field, and a dependencies field for denoting whether an associated chain is dependent on any other chain(s).