A method and data structure for improving the utility of graphics compositions is disclosed. In one embodiment, composition files are created through the connection of patches in a composition editor. Automatically included with the created composition file is protocol information. Preferably such protocol information is included as metadata in the header of the composition file, and can be constructed in any suitable fashion. So constructed, composition files can be grouped together in a physical or virtual repository accessible to other application programs. Another user can then pick an appropriate composition for a new project based on review and filtering of the protocols as contained in the header information of the repositoried composition files. Such review and filtering can be accomplished using a composition picker user interface in the user's application program. The repository can then be queried for composition files matching or otherwise compatible with the specified protocol.