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Common Repository Structure

OpenWallet Foundation projects are required to maintain a standard set of files in each repository. This document describes the required and recommended files.

Required Files with Specified Content

Repositories MUST have these files with the specific content in the linked files, or a file with a link to the specified content with minimal exposition. These files MUST be at the root of the repository.



    All code within the OpenWallet Foundation should be licensed under Apache 2.0. Exceptions can be made by the OpenWallet Foundation Governing Board.



Required Files with Variable Content

Repositories MUST have these files. Named files MUST be at the root of the repository, and may have format suffixes such as .md, .rst, or .txt.

  • README - A description of the project that contains information or links to information such as:
    • A reference to the Apache license (required).
    • The current and important past releases
    • Documentation for developers and users
  • MAINTAINERS - A list of all current maintainers with contact info. A separate document covers the specifics.
  • CONTRIBUTING - Directions on how to contribute code to the project, or a link to a page with that information.
  • CHANGELOG - A human readable list of recent changes. Changes should at least include the current release. This file may be maintainer curated or mechanically produced.
  • Continuous Integration / Continuous Delivery (CICD) configurations - Configurations needed to run CICD on OpenWallet Foundation provided systems (e.g., .github/workflows).

Repositories SHOULD have these files. Named files SHOULD be at the root of the repository

  • NOTICE - As per section 4 subsection d of the Apache License, Version 2
  • Apache License Header information in each source code file. For new files added to OpenWallet Foundation repositories they SHOULD include the snippet SPDX-License-Identifier: Apache-2.0 as part of the header.
  • Build files consistent with the implementation language, such as:
    • For JavaScript/Node.js a package.json file
    • For Ruby a Gemfile file
    • For Java one of a Maven pom.xml, an Apache Ant build.xml, or a Gralde build.gradle
    • file
    • For Python and requirements.txt files
    • For Go go.mod and optionally go.sum
    • For Rust a cargo.toml file
    • For multi-lingual repositories a Makefile or executable script
    • For other languages, other standard build files a practitioner of the language would expect.
  • Testing code - Code to test the code in the repository (such as unit tests), in a location appropriate for the language.

    Why not a MUST?

    Not all repositories can be tested (homebrew, docs), which is the only reason this is a SHOULD.


Repositories MUST NOT have these files

  • Executable binaries and shared library files built by code in the repository. This includes .exe, .dll, .so, .a and .dylib files not otherwise part of a third party library.


This document is based on the Hyperledger Foundation's Common Respository Structure guideline.