If you maintain a registered HDF5 filter plugin, we'd like a few minutes of
your time.
**What's changing.** HDF5 2.x introduces a new filter plugin class,
`H5Z_class3_t`, that adds a string-based configuration API for filters ---
letting users write things like `H5Pappend_filter("zfp", "mode=rate,
rate=3.5")` instead of hand-packing `cd_values` arrays. As part of that, the
existing `H5Z_class_t::name` field gains a stronger contract: in `H5Z_class3_t`
it becomes a **canonical name**, a short stable identifier that the library
writes into the on-disk filter-pipeline message and that tools like `h5dump`
and `h5repack` display. This is the design from RFC-HDFG-2026-001.
**What we need from you.** We've proposed a canonical name for every currently
registered plugin. Please look up your filter ID and **reply to the tracking
issue with one explicit line that names the ID and the name,** so we can match
the reply to a row.
To confirm:
> Confirm: ID `32013`, canonical name `zfp`.
To request a correction (subject to the syntactic rules `[A-Za-z0-9_.-]`, ≤255
bytes, case-sensitive):
> Correction: ID `32013`, canonical name should be `zfp-v2`.
The proposed list, the syntactic rules, and the tracking issue:
* PR: https://github.com/HDFGroup/hdf5_plugins/pull/256 (adds a Canonical Name
column to `docs/RegisteredFilterPlugins.md`)
* Tracking issue: https://github.com/HDFGroup/hdf5_plugins/issues/255
Comment window is roughly six weeks. After that, any unconfirmed rows keep
their proposed name with an *unconfirmed* marker; first-registered-wins still
applies if anyone needs to correct it later.
If you don't have a GitHub account, you can confirm by email to
[email protected], and we'll relay it to the issue.
**What this does not change.** Your existing plugin builds keep working
unchanged with HDF5 2.x. The canonical name only becomes load-bearing when
*you* opt your plugin into the new `H5Z_class3_t` class, which is a separate,
opt-in code change that you control on your own schedule.
If you've moved on from a plugin and you'd like someone else to weigh in,
please point us at the current maintainer, as we'd rather hear from the current
owner than guess.
---
[Visit
Topic](https://forum.hdfgroup.org/t/filter-plugin-maintainers-confirm-a-canonical-name-for-your-filter/13797/1)
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