I am new to the whole package creation thing, but wish to create one or more packages to help work with MathbookXML files (used to author mathematics textbooks), which are a special flavor of XML. I will want some custom syntax highlighting, a good number of snippets and autocomplete functionality, as well as some tools to insert references, jump to sections, and the like, all with keybindings. I don’t know how to do much of this, but I’m eager to figure it all out by adapting other packages.
My question is this: should all of this go in one package (say “MBXTools”) or into multiple packages (like “language-mbx,” “autocomplete-mbx” and “MBXTools”)? It is likely that I’ll be the only one working on this, but there might be others who find the package(s) useful. What are the conventions for such a situation?