Recall that multi-valued Provides-Dist is from the 8-year-old Metadata 1.2 and is unchanged in the new PEP.
When the PEP says "bundle" it means not a pip bundle, but two packages that have been merged together. The example given is ZODB and transaction, which used to be a single PyPI package and now are two. If it had gone the other way, and the two packages became one, then the merged package would Provides-Dist the obsolete name(s). It may not be pretty, but it is not always possible to come up with a perfect distribution factorization the first time around. Provides-Dist (multiple use) <http://www.python.org/dev/peps/pep-0345/#id26> Each entry contains a string naming a Distutils project which is contained within this distribution. This field *must* include the project identified in the Name field, followed by the version : Name (Version). A distribution may provide additional names, e.g. to indicate that multiple projects have been bundled together. For instance, source distributions of the ZODB project have historically included the transaction project, which is now available as a separate distribution. Installing such a source distribution satisfies requirements for both ZODB and transaction. A distribution may also provide a "virtual" project name, which does not correspond to any separately-distributed project: such a name might be used to indicate an abstract capability which could be supplied by one of multiple projects. E.g., multiple projects might supply RDBMS bindings for use by a given ORM: each project might declare that it provides ORM-bindings, allowing other projects to depend only on having at most one of them installed. A version declaration may be supplied and must follow the rules described in Version Specifiers<http://www.python.org/dev/peps/pep-0345/#version-specifiers>. The distribution's version number will be implied if none is specified. Examples: Provides-Dist: OtherProject Provides-Dist: AnotherProject (3.4) Provides-Dist: virtual_package
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