WMO IWXXM 2023-1 (WAFS SIGWX) — Open Data Distribution Terms
==============================================================

The IWXXM (ICAO Meteorological Information Exchange Model) 2023-1
schemas distributed in `src/aviconv_met/schemas/iwxxm-2023-1/iwxxm/`
(`WAFSSigWxFC.xsd`, `metFeature.xsd`, `common.xsd`, `measures.xsd`)
originate from the World Meteorological Organization (WMO) and are
made available under the same WMO open-data terms as the IWXXM 3.0
tree already bundled in this package (`IWXXM-WMO-3.0.txt`).

Source: https://github.com/wmo-im/iwxxm, tag `v2023-1`
(commit e84bf544702e6a3c638e7ab5f02a9c930dda57f7), mirrored at
https://schemas.wmo.int/iwxxm/2023-1/. The example fixture
(`tests/fixtures/sigwx/wafs_sigwx_example.xml`) is the repository's own
`IWXXM/examples/WAFS-Example.xml`, reproduced verbatim.

Unlike the 3.0 tree, no discrete `LICENSE` file is published in the
`wmo-im/iwxxm` GitHub repository (GitHub's own API reports
`"license": null`). This bundle follows the same WMO open-data terms
already relied upon for the 3.0 tree (WMO Technical Regulations,
WMO-No. 49 / ICAO Annex 3 give IWXXM schemas as the reference exchange
format for operational aviation meteorological data, published for
free reproduction and implementation):

1. The WMO is credited as the source (this file).
2. No representation is made that the WMO endorses or is responsible
   for any derivative work, application, or service that uses the
   schemas.
3. The four IWXXM XSDs above are distributed byte-identical to the
   upstream repository — no modifications. Redirection of their
   `<import>` `schemaLocation` (AIXM 5.1.1, GML 3.2.1) to the local
   vendored copies is done at schema-load time via `xmlschema`'s
   `locations=` argument (see `iwxxm/sigwx.py`), not by editing the
   XSD text.

`WAFSSigWxFC.xsd` additionally imports AIXM 5.1.1 (for
`aixm:CodeVerticalReferenceBaseType` and, transitively via
`common.xsd`'s generic feature-reference elements, the full AIXM
5.1.1 feature/type closure) and GML 3.2.1. Both are vendored verbatim
under `schemas/iwxxm-2023-1/aixm-5.1.1/`, a byte-identical copy of the
tree already bundled by `aviconv-aixm` — see `AIXM-BSD-3-Clause.txt`
and `GML-OGC.txt` in this directory for their respective terms.

aviconv-met is MIT-licensed. The bundled WMO, OGC, and AIXM schemas
retain their original terms. No part of aviconv-met should be
construed as an official WMO, ICAO, OGC, EUROCONTROL, FAA, or
national-meteorological-service product.
