* Guide: Split router module in guide. Now we have: DMP, UMP and Router module. * Add a glossary entry for what used to be called Router * Extract DMP * Extract UMP * Extract HRMP * Switch over to new modules * Router: goodbye sweet prince * Link to messaging overview for details. * Update missed rococo and test runtimes. * Commit destroyed by rebase changes * Don't deprecate Router but rather make it a meta-project Co-authored-by: Bernhard Schuster <bernhard@ahoi.io> * Fix typos suggestion Co-authored-by: Bernhard Schuster <bernhard@ahoi.io> * Fix repetition in the impl guide * Clarify that processed_downward_messages has the u32 type * Remove the router subdir. * Deabbreviate DMP,UMP,HRMP Co-authored-by: Bernhard Schuster <bernhard@ahoi.io>
Preamble
This document aims to describe the purpose, functionality, and implementation of the host for Polkadot's parachains functionality - that is, the software which provides security and advancement for constituent parachains. It is not for the implementer of a specific parachain but rather for the implementer of the Parachain Host. In practice, this is for the implementers of Polkadot in general.
There are a number of other documents describing the research in more detail. All referenced documents will be linked here and should be read alongside this document for the best understanding of the full picture. However, this is the only document which aims to describe key aspects of Polkadot's particular instantiation of much of that research down to low-level technical details and software architecture.