Motion: Composition can be a way to express an implementation guide (using its section structure for the various parts of an implementation guide and maybe profiling to constrain it to contain mandatory sections). Seeing this comment comes from Brett, we suggest this fact is discussed within StructDocs and upon agreement add an example to the Composition page to show how this could be done. As well, Composition currently contains mandatory elements that may not make sense in the context of an implementation guide.