diff --git a/.gitignore b/.gitignore
index a9a908e..f49408a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -28,3 +28,6 @@
 /OWSLib-0.25.0.tar.gz
 /OWSLib-0.26.0.tar.gz
 /OWSLib-0.27.2.tar.gz
+/OWSLib-0.28.0.tar.gz
+/OWSLib-0.28.1.tar.gz
+/OWSLib-0.28.1-filtered.tar.zst
diff --git a/get_source b/get_source
new file mode 100755
index 0000000..085fbb8
--- /dev/null
+++ b/get_source
@@ -0,0 +1,63 @@
+#!/bin/sh
+set -o nounset
+set -o errexit
+
+FORGEURL='https://github.com/geopython/OWSLib'
+
+print_help()
+{
+	cat <<EOF
+Usage: $1 VERSION
+
+Generate a source archive for OWSLib with questionably-licensed XML files in
+tests/resources/ removed. The result will be named
+OWSLib-\${VERSION}-filtered.tar.zst and will be written into the current
+working directory.
+EOF
+}
+
+if [ "$#" != '1' ]
+then
+	exec 1>&2
+	print_help "${0}"
+	exit 1
+elif [ "${1-}" = '-h' ] || [ "${1-}" = '--help' ]
+then
+	print_help "${0}"
+	exit 0
+fi
+
+VERSION="${1}"
+SOURCE0="${FORGEURL}/archive/${VERSION}/OWSLib-${VERSION}.tar.gz"
+TARNAME="$(basename "${SOURCE0}")"
+TARDIR="$(basename "${SOURCE0}" '.tar.gz')"
+NEWTAR="${TARDIR}-filtered.tar.zst"
+
+SAVEDIR="${PWD}"
+XDIR="$(mktemp -d)"
+trap "rm -rf '${XDIR}'" INT TERM EXIT
+
+cd "${XDIR}"
+curl -L -O "${SOURCE0}"
+echo "Extracting ${TARNAME}…" 1>&2
+tar -xzf "${TARNAME}"
+MTIME="$(stat -c '%Y' "${TARDIR}")"
+rm -rvf "${TARDIR}/tests/resources"
+echo "Re-compressing as ${NEWTAR}…" 1>&2
+# https://www.gnu.org/software/tar/manual/html_section/Reproducibility.html
+# We reset all mtimes to that of the top-level extracted directory; since git
+# archives don’t have meaningful per-file mtimes, nothing useful is lost.
+TZ=UTC LC_ALL=C tar \
+    --create \
+    --sort=name \
+    --format=posix \
+    --numeric-owner --owner=0 --group=0 \
+    --mode=go+u,go-w \
+    --pax-option='delete=atime,delete=ctime' \
+    --clamp-mtime --mtime="@${MTIME}" \
+    "${TARDIR}/" |
+  zstdmt --ultra -22 > "${NEWTAR}"
+touch -d @"${MTIME}" "${NEWTAR}"
+
+cd "${SAVEDIR}"
+mv -v "${XDIR}/${NEWTAR}" .
diff --git a/python-OWSLib.rpmlintrc b/python-OWSLib.rpmlintrc
new file mode 100644
index 0000000..981f880
--- /dev/null
+++ b/python-OWSLib.rpmlintrc
@@ -0,0 +1,2 @@
+# All documentation is in the -doc subpackage.
+addFilter(r" no-documentation$")
diff --git a/python-OWSLib.spec b/python-OWSLib.spec
index 5c545e4..b079441 100644
--- a/python-OWSLib.spec
+++ b/python-OWSLib.spec
@@ -1,17 +1,37 @@
 # Sphinx-generated HTML documentation is not suitable for packaging; see
 # https://bugzilla.redhat.com/show_bug.cgi?id=2006555 for discussion.
 #
-# We can generate PDF documentation as a substitute.
-%bcond_without doc_pdf
+# We can generate PDF documentation as a substitute. However, EPEL9 is
+# currently missing some documentation dependencies:
+#   - python-ipykernel
+#   - python-nbconvert
+#   - python-nbsphinx
+%bcond doc_pdf 0
 
 Name:           python-OWSLib
-Version:        0.27.2
+Version:        0.28.1
 Release:        %autorelease
-Summary:        Client library for OGC web services
+Summary:        OGC Web Service utility library
 
 License:        BSD-3-Clause
 URL:            https://geopython.github.io/OWSLib
-Source0:        https://github.com/geopython/OWSLib/archive/%{version}/OWSLib-%{version}.tar.gz
+# A filtered source archive, obtained by (see Source1):
+#
+#   ./get_source %%{version}
+#
+# is required because tests/resources/ contains XML data files that appear to
+# have been pulled from various GIS databases, and the license terms for these
+# files are unclear.
+#
+# The unfiltered base source URL would be:
+#
+# https://github.com/geopython/OWSLib/archive/%%{version}/OWSLib-%%{version}.tar.gz
+#
+# We *could* use the PyPI sdist, which does not contain tests/resources/, but
+# it also does not contain any tests at all. We can still run some tests
+# without the XML files, and we would like to do so.
+Source0:        OWSLib-%{version}-filtered.tar.zst
+Source1:        get_source
 
 BuildArch:      noarch
 
@@ -86,72 +106,74 @@ echo 'nbsphinx_allow_errors = True' >> docs/conf.py
 
 
 %generate_buildrequires
-%pyproject_buildrequires -r requirements-dev-filtered.txt
+%pyproject_buildrequires requirements-dev-filtered.txt
 
 
 %build
 %pyproject_wheel
 
 %if %{with doc_pdf}
-PYTHONPATH="${PWD}" %make_build -C docs latex SPHINXOPTS='%{?_smp_mflags}'
+PYTHONPATH="${PWD}" %make_build -C docs latex \
+    SPHINXOPTS='-j%{?_smp_build_ncpus}'
 %make_build -C docs/build/latex/en LATEXMKOPTS='-quiet'
 %endif
 
 
 %install
 %pyproject_install
-%pyproject_save_files owslib
+%pyproject_save_files -l owslib
 
 
 %check
 # Otherwise, pytest finds the package twice in the Python path and complains.
 rm -rf owslib
 
-# There is a convenient “online” mark for deselecting tests that require
-# Internet access, but we still have to manually deselect doctests that try to
-# make network requests.
-k="${k-}${k+ and }not wms_geoserver_mass_gis.txt"
-k="${k-}${k+ and }not wfs_MapServerWFSFeature.txt"
-k="${k-}${k+ and }not wfs_MapServerWFSCapabilities.txt"
-k="${k-}${k+ and }not wfs2_storedqueries.txt"
-k="${k-}${k+ and }not wfs1_generic.txt"
-k="${k-}${k+ and }not wcs_thredds.txt"
+# These require test data files from tests/resources/, which we have removed:
+ignore="${ignore-} --ignore-glob=tests/doctests/*.txt"
+k="${k-}${k+ and }not test_gm03"
+ignore="${ignore-} --ignore=tests/test_iso_parsing.py"
+ignore="${ignore-} --ignore=tests/test_ows_interfaces.py"
+ignore="${ignore-} --ignore=tests/test_owscontext_atomxml.py"
+k="${k-}${k+ and }not test_decode_single_json"
+k="${k-}${k+ and }not test_load_parse"
+k="${k-}${k+ and }not test_decode_full_json"
+k="${k-}${k+ and }not test_load_bulk"
+ignore="${ignore-} --ignore=tests/test_remote_metadata.py"
+k="${k-}${k+ and }not TestOffline"
+ignore="${ignore-} --ignore=tests/test_wfs_generic.py"
+ignore="${ignore-} --ignore=tests/test_wms_datageo_130.py"
+ignore="${ignore-} --ignore=tests/test_wms_jpl_capabilities.py"
+k="${k-}${k+ and }not test_wps_getOperationByName"
+k="${k-}${k+ and }not test_wps_checkStatus"
+k="${k-}${k+ and }not test_wps_process_representation"
+k="${k-}${k+ and }not test_wps_process_properties"
+k="${k-}${k+ and }not test_wps_literal_data_input_parsing_references"
+k="${k-}${k+ and }not test_wps_response_with_lineage"
+ignore="${ignore-} --ignore=tests/test_wps_describeprocess_bbox.py"
+ignore="${ignore-} --ignore=tests/test_wps_describeprocess_ceda.py"
+ignore="${ignore-} --ignore=tests/test_wps_describeprocess_emu_all.py"
+ignore="${ignore-} --ignore=tests/test_wps_describeprocess_usgs.py"
+ignore="${ignore-} --ignore=tests/test_wps_execute.py"
+ignore="${ignore-} --ignore=tests/test_wps_execute_invalid_request.py"
+ignore="${ignore-} --ignore=tests/test_wps_getcapabilities_52n.py"
+ignore="${ignore-} --ignore=tests/test_wps_getcapabilities_ceda.py"
+ignore="${ignore-} --ignore=tests/test_wps_getcapabilities_usgs.py"
+ignore="${ignore-} --ignore-glob=tests/test_wps_request*.py"
+ignore="${ignore-} --ignore-glob=tests/test_wps_response*.py"
+# Not in 0.30.0:
 k="${k-}${k+ and }not test_wmts_example_informatievlaanderen"
 
-# This is a trivial error where the representation of the expected TypeError
-# has changed over time:
-# Differences (unified diff with -expected +actual):
-#     @@ -1,3 +1,6 @@
-#      Traceback (most recent call last):
-#     -...
-#     -TypeError: get_namespace() ...
-#     +  File "/usr/lib64/python3.10/doctest.py", line 1346, in __run
-#     +    exec(compile(example.source, filename, "single",
-#     +  File "<doctest namespaces.txt[15]>", line 1, in <module>
-#     +    ns.get_namespace()
-#     +TypeError: Namespaces.get_namespace() missing 1 required positional argument: 'key'
-k="${k-}${k+ and }not namespaces.txt"
-
-# Unknown problem—check if it is fixed in a later version:
-k="${k-}${k+ and } not (TestOffline and test_wfs_110_remotemd_parse_all)"
-k="${k-}${k+ and } not (TestOffline and test_wfs_110_remotemd_parse_single)"
-k="${k-}${k+ and } not (TestOffline and test_wfs_200_remotemd_parse_all)"
-k="${k-}${k+ and } not (TestOffline and test_wfs_200_remotemd_parse_single)"
-k="${k-}${k+ and } not (TestOffline and test_wms_130_remotemd_parse_all)"
-k="${k-}${k+ and } not (TestOffline and test_wms_130_remotemd_parse_single)"
-
-%pytest -m 'not online' -k "${k-}"
+%pytest -m 'not online' -k "${k-}" ${ignore-} -v -rs
 
 
 %files -n python3-OWSLib -f %{pyproject_files}
-# pyproject_files handles LICENSE; verify with “rpm -qL -p …”
-%doc AUTHORS.rst
-%doc CHANGES.rst
-%doc README.rst
 
 
 %files doc
 %license LICENSE
+%doc AUTHORS.rst
+%doc CHANGES.rst
+%doc README.rst
 %doc examples
 %if %{with doc_pdf}
 %doc docs/build/latex/en/OWSLib.pdf
diff --git a/sources b/sources
index 3d2520a..ab670fa 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (OWSLib-0.27.2.tar.gz) = 02c70731ef92783d53b8f0dff2cec7d28d14ac08b0a4b5090183f9eacf156d539c823fcd2ae480c07447e901697de498cdf2aaf27c8b6d46fa4cf8eb3679ceee
+SHA512 (OWSLib-0.28.1-filtered.tar.zst) = b32734fb953612e617ab28387ae55c349b8ce119454c712e7c425322d952895031c0fb15f6614a17bb34e7588cd5f90ccfcb2cc1eba1a719c569d3ae4eb44684