From 39fe024874f99d43b18ca8073497e2e69e35bde7 Mon Sep 17 00:00:00 2001
From: Alan <njshk@163.com>
Date: Thu, 1 Oct 2026 08:18:23 +0800
Subject: [PATCH] Handle missing optional Tags in OpenSearch descriptions

---
 owslib/opensearch.py     |  2 +-
 tests/test_opensearch.py | 27 +++++++++++++++++++++++++++
 2 files changed, 28 insertions(+), 1 deletion(-)
 create mode 100644 tests/test_opensearch.py

diff --git a/owslib/opensearch.py b/owslib/opensearch.py
index 616122cd..65b660de 100644
--- a/owslib/opensearch.py
+++ b/owslib/opensearch.py
@@ -167,7 +167,7 @@ def __init__(self, md):
         self.outputencoding = testXMLValue(val)
 
         val = md.find(nspath_eval('os:Tags', namespaces))
-        self.tags = testXMLValue(val).split()
+        self.tags = (testXMLValue(val) or '').split()
 
         val = md.find(nspath_eval('os:Contact', namespaces))
         self.contact = testXMLValue(val)
diff --git a/tests/test_opensearch.py b/tests/test_opensearch.py
new file mode 100644
index 00000000..0336768e
--- /dev/null
+++ b/tests/test_opensearch.py
@@ -0,0 +1,27 @@
+import pytest
+
+from owslib.opensearch import OpenSearch
+
+
+@pytest.mark.parametrize('tags_xml, expected_tags', [
+    ('', []),
+    ('<Tags/>', []),
+    ('<Tags>   </Tags>', []),
+    ('<Tags>earth observation</Tags>', ['earth', 'observation']),
+])
+def test_opensearch_description_optional_tags(tags_xml, expected_tags):
+    xml = f'''<OpenSearchDescription xmlns="http://a9.com/-/spec/opensearch/1.1/">
+        <ShortName>Example search</ShortName>
+        <Description>Search public observations</Description>
+        <Url type="application/atom+xml"
+             template="https://example.com/search?q={{searchTerms}}"/>
+        {tags_xml}
+    </OpenSearchDescription>'''
+
+    client = OpenSearch('https://example.com/opensearch', xml=xml)
+
+    assert client.description.tags == expected_tags
+    assert client.description.shortname == 'Example search'
+    assert client.description.urls['application/atom+xml']['template'] == (
+        'https://example.com/search?q={searchTerms}'
+    )