Unable to load CSW schema from https://schemas.opengis.net/csw/2.0.2/csw.xsd

[lion1109]

You may reproduce the error by:

import xmlschema
from xmlschema.exceptions import XMLSchemaException
schema_url = 'https://schemas.opengis.net/csw/2.0.2/csw.xsd'
xml_schema = xmlschema.XMLSchema(schema_url)

The resulting output is:

C:\Users\eduard\miniconda3\envs\s4c\python.exe C:\Users\eduard\soil4climate\soil4climate\DataProvider\test\TestValidation.py
Traceback (most recent call last):
File "C:\Users\eduard\soil4climate\soil4climate\DataProvider\test\TestValidation.py", line 8, in
xml_schema = xmlschema.XMLSchema(schema_url)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\eduard\miniconda3\envs\s4c\Lib\site-packages\xmlschema\validators\schemas.py", line 522, in init
self.maps.build()
File "C:\Users\eduard\miniconda3\envs\s4c\Lib\site-packages\xmlschema\validators\global_maps.py", line 682, in build
self.check(filter(lambda x: x.meta_schema is not None, not_loaded_schemas), self.validation)
File "C:\Users\eduard\miniconda3\envs\s4c\Lib\site-packages\xmlschema\validators\global_maps.py", line 735, in check
xsd_type.parse_error(msg, validation=validation)
File "C:\Users\eduard\miniconda3\envs\s4c\Lib\site-packages\xmlschema\validators\xsdbase.py", line 204, in parse_error
raise error
xmlschema.validators.exceptions.XMLSchemaParseError: the derived group is an illegal restriction:

Schema component:

Basic encoding for coordinate system objects, simplifying and restricting the DefinitionType as needed.

Path: /schema/complexType[4]

Schema URL: http://schemas.opengis.net/gml/3.1.1/base/coordinateSystems.xsd

Origin URL: https://schemas.opengis.net/csw/2.0.2/csw.xsd

My environment is:
Win11, PyCharm, Miniconda:
(s4c) C:\Users\eduard\miniconda3>conda list

packages in environment at C:\Users\eduard\miniconda3\envs\s4c:

Name Version Build Channel

aiohappyeyeballs 2.4.0 py312haa95532_0
aiohttp 3.10.5 py312h827c3e9_0
aiosignal 1.2.0 pyhd3eb1b0_0
annotated-types 0.6.0 py312haa95532_0
anyio 4.2.0 py312haa95532_0
argcomplete 3.5.1 pypi_0 pypi
attrs 24.2.0 pyh71513ae_0 conda-forge
aws-c-auth 0.7.31 hce3b56f_0 conda-forge
aws-c-cal 0.7.4 hf1fc857_1 conda-forge
aws-c-common 0.9.28 h2466b09_0 conda-forge
aws-c-compression 0.2.19 hf1fc857_1 conda-forge
aws-c-event-stream 0.4.3 hd0ca3c1_2 conda-forge
aws-c-http 0.8.10 heca9ddf_0 conda-forge
aws-c-io 0.14.18 h3831a8d_9 conda-forge
aws-c-mqtt 0.10.5 hf27581b_1 conda-forge
aws-c-s3 0.6.5 h56e9fbd_7 conda-forge
aws-c-sdkutils 0.1.19 hf1fc857_3 conda-forge
aws-checksums 0.1.20 hf1fc857_0 conda-forge
aws-crt-cpp 0.28.3 he121d5a_3 conda-forge
aws-sdk-cpp 1.11.379 h25dd3c2_11 conda-forge
azure-core-cpp 1.13.0 haf5610f_0 conda-forge
azure-identity-cpp 1.8.0 h148e6f0_2 conda-forge
azure-storage-blobs-cpp 12.12.0 hf03c1c4_0 conda-forge
azure-storage-common-cpp 12.7.0 h148e6f0_1 conda-forge
blosc 1.21.6 h85f69ea_0 conda-forge
bzip2 1.0.8 h2bbff1b_6
c-ares 1.33.1 h2466b09_0 conda-forge
ca-certificates 2024.8.30 h56e8100_0 conda-forge
cachecontrol 0.14.0 pypi_0 pypi
cairo 1.18.0 h32b962e_3 conda-forge
certifi 2024.8.30 pypi_0 pypi
cfitsio 4.4.1 hc2ea260_0 conda-forge
charset-normalizer 3.3.2 pypi_0 pypi
click 8.1.7 win_pyh7428d3b_0 conda-forge
click-plugins 1.1.1 py_0 conda-forge
cligj 0.7.2 pyhd8ed1ab_1 conda-forge
colorama 0.4.6 pyhd8ed1ab_0 conda-forge
coloredlogs 15.0.1 pypi_0 pypi
contourpy 1.3.0 pypi_0 pypi
cwl-upgrader 1.2.11 pypi_0 pypi
cwl-utils 0.35 pypi_0 pypi
cwltool 3.1.20241007082533 pypi_0 pypi
cycler 0.12.1 pypi_0 pypi
descartes 1.1.0 pypi_0 pypi
elementpath 4.5.0 pypi_0 pypi
expat 2.6.3 h5da7b33_0
fastapi 0.112.2 py312haa95532_0
filelock 3.16.1 pypi_0 pypi
fiona 1.10.1 py312hd215820_1 conda-forge
fmt 11.0.2 h7f575de_0 conda-forge
font-ttf-dejavu-sans-mono 2.37 hab24e00_0 conda-forge
font-ttf-inconsolata 3.000 h77eed37_0 conda-forge
font-ttf-source-code-pro 2.038 h77eed37_0 conda-forge
font-ttf-ubuntu 0.83 h77eed37_2 conda-forge
fontconfig 2.14.2 hbde0cde_0 conda-forge
fonts-conda-ecosystem 1 0 conda-forge
fonts-conda-forge 1 0 conda-forge
fonttools 4.53.1 pypi_0 pypi
freetype 2.12.1 hdaf720e_2 conda-forge
freexl 2.0.0 h8276f4a_0 conda-forge
frozenlist 1.4.0 py312h2bbff1b_0
gdal 3.9.2 py312h16ac12d_3 conda-forge
geos 3.12.2 h5a68840_1 conda-forge
geotiff 1.7.3 h496ac4d_3 conda-forge
h11 0.14.0 py312haa95532_0
hdf4 4.2.15 h5557f11_7 conda-forge
hdf5 1.14.3 nompi_h2b43c12_105 conda-forge
humanfriendly 10.0 pypi_0 pypi
icu 75.1 he0c23c2_0 conda-forge
idna 3.10 pypi_0 pypi
intel-openmp 2024.2.1 h57928b3_1083 conda-forge
isodate 0.6.1 pypi_0 pypi
kealib 1.5.3 h6c43f9b_2 conda-forge
kiwisolver 1.4.7 pypi_0 pypi
krb5 1.21.3 hdf4eb48_0 conda-forge
lcms2 2.16 h67d730c_0 conda-forge
lerc 4.0.0 h63175ca_0 conda-forge
libabseil 20240116.2 cxx17_he0c23c2_1 conda-forge
libaec 1.1.3 h63175ca_0 conda-forge
libarchive 3.7.4 haf234dc_0 conda-forge
libblas 3.9.0 23_win64_mkl conda-forge
libcblas 3.9.0 23_win64_mkl conda-forge
libcrc32c 1.1.2 h0e60522_0 conda-forge
libcurl 8.10.1 h1ee3ff0_0 conda-forge
libdeflate 1.21 h2466b09_0 conda-forge
libexpat 2.6.3 he0c23c2_0 conda-forge
libffi 3.4.4 hd77b12b_1
libgdal 3.9.2 h57928b3_3 conda-forge
libgdal-core 3.9.2 h968bd71_3 conda-forge
libgdal-fits 3.9.2 h0a0b71e_3 conda-forge
libgdal-grib 3.9.2 hd2a089b_3 conda-forge
libgdal-hdf4 3.9.2 h430f241_3 conda-forge
libgdal-hdf5 3.9.2 had131a1_3 conda-forge
libgdal-jp2openjpeg 3.9.2 hed4c6cb_3 conda-forge
libgdal-kea 3.9.2 h95b1a77_3 conda-forge
libgdal-netcdf 3.9.2 h55e78d3_3 conda-forge
libgdal-pdf 3.9.2 ha1c78db_3 conda-forge
libgdal-pg 3.9.2 ha693a0f_3 conda-forge
libgdal-postgisraster 3.9.2 ha693a0f_3 conda-forge
libgdal-tiledb 3.9.2 hb8b5d01_3 conda-forge
libgdal-xls 3.9.2 hd0e23a6_3 conda-forge
libglib 2.80.3 h7025463_2 conda-forge
libgoogle-cloud 2.29.0 h5e7cea3_0 conda-forge
libgoogle-cloud-storage 2.29.0 he5eb982_0 conda-forge
libgrpc 1.62.2 h5273850_0 conda-forge
libhwloc 2.11.1 default_h8125262_1000 conda-forge
libiconv 1.17 hcfcfb64_2 conda-forge
libintl 0.22.5 h5728263_3 conda-forge
libjpeg-turbo 3.0.0 hcfcfb64_1 conda-forge
libkml 1.3.0 h538826c_1021 conda-forge
liblapack 3.9.0 23_win64_mkl conda-forge
libnetcdf 4.9.2 nompi_h92078aa_114 conda-forge
libpng 1.6.44 h3ca93ac_0 conda-forge
libpq 16.4 hab9416b_1 conda-forge
libprotobuf 4.25.3 h503648d_0 conda-forge
libre2-11 2023.09.01 hf8d8778_2 conda-forge
librttopo 1.1.0 h6c42fcb_16 conda-forge
libspatialite 5.1.0 h655691a_10 conda-forge
libsqlite 3.46.1 h2466b09_0 conda-forge
libssh2 1.11.0 h7dfc565_0 conda-forge
libtiff 4.6.0 hb151862_4 conda-forge
libwebp-base 1.4.0 hcfcfb64_0 conda-forge
libxml2 2.12.7 h0f24e4e_4 conda-forge
libzip 1.10.1 h1d365fa_3 conda-forge
libzlib 1.3.1 h2466b09_1 conda-forge
loguru 0.7.2 pypi_0 pypi
lxml 5.3.0 pypi_0 pypi
lz4-c 1.9.4 hcfcfb64_0 conda-forge
lzo 2.10 hcfcfb64_1001 conda-forge
matplotlib 3.9.2 pypi_0 pypi
minizip 4.0.6 hb638d1e_0 conda-forge
mistune 3.0.2 pypi_0 pypi
mkl 2024.1.0 h66d3029_694 conda-forge
msgpack 1.1.0 pypi_0 pypi
multidict 6.0.4 py312h2bbff1b_0
mypy-extensions 1.0.0 pypi_0 pypi
networkx 3.4.1 pypi_0 pypi
numpy 2.1.1 py312h49bc9c5_0 conda-forge
ogc-ap-validator 0.5.0 pypi_0 pypi
opencv-contrib-python 4.10.0.84 pypi_0 pypi
openjpeg 2.5.2 h3d672ee_0 conda-forge
openssl 3.3.2 h2466b09_0 conda-forge
owslib 0.31.0 pypi_0 pypi
packaging 24.1 pypi_0 pypi
pcre2 10.44 h3d7b363_2 conda-forge
pillow 10.4.0 pypi_0 pypi
pip 24.2 py312haa95532_0
pixman 0.43.4 h63175ca_0 conda-forge
platformdirs 4.3.6 pypi_0 pypi
poppler 24.08.0 h9415970_1 conda-forge
poppler-data 0.4.12 hd8ed1ab_0 conda-forge
postgresql 16.4 hd835ec0_1 conda-forge
proj 9.5.0 hd9569ee_0 conda-forge
prov 1.5.1 pypi_0 pypi
psutil 6.0.0 pypi_0 pypi
pthreads-win32 2.9.1 hfa6e2cd_3 conda-forge
pydantic 2.8.2 py312haa95532_0
pydantic-core 2.20.1 py312hefb1915_0
pydentic 0.0.1.dev3 pypi_0 pypi
pydot 2.0.0 pypi_0 pypi
pyparsing 3.1.4 pyhd8ed1ab_0 conda-forge
pyproj 3.6.1 pypi_0 pypi
pyreadline3 3.5.4 pypi_0 pypi
python 3.12.5 h889d299_0_cpython conda-forge
python-dateutil 2.9.0.post0 pypi_0 pypi
python-stdnum 1.20 pypi_0 pypi
python_abi 3.12 5_cp312 conda-forge
pytz 2024.2 pypi_0 pypi
pyyaml 6.0.2 pypi_0 pypi
rdflib 7.0.0 pypi_0 pypi
re2 2023.09.01 hd3b24a8_2 conda-forge
requests 2.32.3 pypi_0 pypi
requests-file 2.1.0 pypi_0 pypi
requests-toolbelt 1.0.0 pypi_0 pypi
ruamel-yaml 0.18.6 pypi_0 pypi
ruamel-yaml-clib 0.2.8 pypi_0 pypi
schema-salad 8.7.20241010092723 pypi_0 pypi
scipy 1.14.1 pypi_0 pypi
setuptools 72.1.0 py312haa95532_0
shapely 2.0.6 py312h3a88d77_1 conda-forge
six 1.16.0 pypi_0 pypi
snappy 1.2.1 h23299a8_0 conda-forge
sniffio 1.3.0 py312haa95532_0
spdlog 1.14.1 h9f2357e_1 conda-forge
spython 0.3.14 pypi_0 pypi
sqlite 3.45.3 h2bbff1b_0
starlette 0.38.2 py312haa95532_0
tbb 2021.13.0 hc790b64_0 conda-forge
tiledb 2.26.1 hfc7a24e_0 conda-forge
tk 8.6.13 h5226925_1 conda-forge
tornado 6.4.1 pypi_0 pypi
typing-extensions 4.11.0 py312haa95532_0
typing_extensions 4.11.0 py312haa95532_0
tzdata 2024a h04d1e81_0
ucrt 10.0.22621.0 h57928b3_0 conda-forge
uriparser 0.9.8 h5a68840_0 conda-forge
urllib3 2.2.3 pypi_0 pypi
uvicorn 0.20.0 py312haa95532_0
vc 14.40 h2eaa2aa_1
vc14_runtime 14.40.33810 ha82c5b3_21 conda-forge
vs2015_runtime 14.40.33810 h3bf8584_21 conda-forge
wheel 0.44.0 py312haa95532_0
win32-setctime 1.1.0 pypi_0 pypi
xerces-c 3.2.5 he0c23c2_1 conda-forge
xmlschema 3.4.2 pypi_0 pypi
xz 5.4.6 h8cc25b3_1
yarl 1.11.0 py312h827c3e9_0
zeep 4.2.1 pypi_0 pypi
zlib 1.3.1 h2466b09_1 conda-forge
zstd 1.5.6 h0ea2cb4_0 conda-forge

[brunato]

Hi,
this is related to a case of W3C XSD tests that is still in disputed state (see bug 4147).

I consider this valid only for XSD 1.1 where the equivalent choice group derivation is valid. So you have to use XMLSchema11 class to build the schema.

For disputed situations I will consider if adding a strict=False option could help.

[brunato]

For disputed situations I will consider if adding a strict=False option could help.

Nope, the XMLSchema/XMLSchema11 classes already have validation='strict' option. For controversial cases or also if the schema has in fact invalid restrictions validation='lax' can be provided.

>>> import xmlschema
>>> schema_url = 'https://schemas.opengis.net/csw/2.0.2/csw.xsd'
>>> schema = xmlschema.XMLSchema(schema_url, validation='lax')
>>>

The created schema is usable for validation in strict mode, with the limitation that effectively wrong restrictions can produce inconsistencies between validations with the base type and derived types.

For this case there are no differences, anyway you can use XMLSchema11 as well. With lax mode the schema parse errors can be retrieved using schema.all_errors (schema.maps.all_errors to get also the errors of included/imported schemas).