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mgorny merged 2 commits into from
Jul 24, 2026
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PEP 825: add explicit "implementation requirements" #64

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PEP 825: add explicit "implementation requirements"
mgorny Jul 21, 2026
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Update peps/pep-0825.rst
mgorny Jul 21, 2026
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20 changes: 20 additions & 0 deletions peps/pep-0825.rst
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Expand Up @@ -70,6 +70,26 @@ The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
document are to be interpreted as described in :rfc:`2119`.


Implementation requirements
---------------------------

This specification is written from the perspective of file format producers.
In the context of format definitions, the word "MUST" specifically
indicates that the requirement must be satisfied for the data to be
considered valid according to this specifications.

Tools that produce the data formats according to this specification
(variant wheels, the index-level metadata file) MUST always produce
files that meet the requirements of this specification.

Tools that consume the data formats according to this specification
SHOULD refuse to process the files that do not meet these requirements.
In this case, it is recommended to follow the same behavior as for
invalid Core Metadata in wheel files. For example, a wheel index may
reject the upload, while a package manager may skip the version
entirely.


Variant wheel
-------------

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