enhancement: full global office central document with all office documents as parts The global document ODM is only for writer documents. So it is limited to writer. A new central document is linkable to all LO-Documents with base, calc, draw, impress, math, writer, HTML, XML, visit cards, etiquettes. All Documents are in one container or folder with the central document. So a project is simply portable without new linkage by the new needed path in the normal way of work. So LibreOffice can take more advantage of modules. Microsoft Office Dokument and Chinese office format UOTS are milestones on way to real global office documents.
What is the real advantage here? If you have all your files in a single directory, you already have a portable project. ODM is *not* a "container". It is a method to centrally *manage appearance* in the linked documents through styles: the main purpose is to have styles used in linked documents to be re-defined in master document, and have the result be consistent, even if sub-documents used different definitions of those styles. It also allows to have several representations of the same text: you may have different masters with different style definitions, and depending on which master you use, you have a CSS-like change of appearance. All this is unrelated to other document types; so this is clearly out of scope of master documents. IMO => WONTFIX.
You can embed objects to keep different content together. Besides the technical challenge, nonethelast the restriction from the file format, I also don't see much advantage for the workflow.
No more input, resolving as WF.