--- a/CHANGES.txt	Sun May 11 20:22:45 2025 -0400
+++ b/CHANGES.txt	Sun May 11 20:26:42 2025 -0400
@@ -89,6 +89,9 @@
 - issue2551376: Fix tracebacks in item templates (Ralf Schlatterbeck)
 - issue2551396: Use of os.path.stat.ST_MTIME in python 3.13 crashes
   roundup on windows. Replaced with equivalent stat.ST_MTIME.
+- issue2551323: remove functions used for XHTML template
+  support. XHTML was deprecated in Roundup 2.3.0 and an invalid value
+  in 2.4.0.
 
 Features:
 

--- a/roundup/cgi/templating.py	Sun May 11 20:22:45 2025 -0400
+++ b/roundup/cgi/templating.py	Sun May 11 20:26:42 2025 -0400
@@ -628,44 +628,20 @@
                      for k, v in sorted(attrs.items())])
 
 
-def xhtml_cgi_escape_attrs(**attrs):
-    ''' Boolean attributes like 'disabled', 'required'
-        are represented with a value that is the same as
-        the attribute name.. E.G.
-           <input required="required" ...> not <input required ..>
-        The latter is html4 or 5. Recognize booleans by:
-          value is None
-        Code can use None to indicate a pure boolean.
-    '''
-    return ' '.join(['%s="%s"' % (k, html_escape(str(v), True))
-                     if v is not None else '%s="%s"' % (k, k)
-                     for k, v in sorted(attrs.items())])
-
-
 def input_html4(**attrs):
     """Generate an 'input' (html4) element with given attributes"""
     _set_input_default_args(attrs)
     return '<input %s>' % html4_cgi_escape_attrs(**attrs)
 
 
-def input_xhtml(**attrs):
-    """Generate an 'input' (xhtml) element with given attributes"""
-    _set_input_default_args(attrs)
-    return '<input %s/>' % xhtml_cgi_escape_attrs(**attrs)
-
-
 class HTMLInputMixin(object):
     """ requires a _client property """
     def __init__(self):
         html_version = 'html4'
         if hasattr(self._client.instance.config, 'HTML_VERSION'):
             html_version = self._client.instance.config.HTML_VERSION
-        if html_version == 'xhtml':
-            self.input = input_xhtml
-            self.cgi_escape_attrs = xhtml_cgi_escape_attrs
-        else:
-            self.input = input_html4
-            self.cgi_escape_attrs = html4_cgi_escape_attrs
+        self.input = input_html4
+        self.cgi_escape_attrs = html4_cgi_escape_attrs
         # self._context is used for translations.
         # will be initialized by the first call to .gettext()
         self._context = None

--- a/test/test_templating.py	Sun May 11 20:22:45 2025 -0400
+++ b/test/test_templating.py	Sun May 11 20:26:42 2025 -0400
@@ -710,24 +710,6 @@
         input=input_html4(**attrs)
         self.assertEqual(input, '<input class="required" disabled="disabled" size="30" type="text">')
 
-    def test_input_xhtml(self):
-        # boolean attributes are attribute name="attribute name"
-        # indicate with attr=None or attr="attr"
-        #    e.g. disabled="disabled"
-        input=input_xhtml(required=None, size=30)
-        self.assertEqual(input, '<input required="required" size="30" type="text"/>')
-
-        input=input_xhtml(required="required", size=30)
-        self.assertEqual(input, '<input required="required" size="30" type="text"/>')
-
-        attrs={"required": None, "class": "required", "size": 30}
-        input=input_xhtml(**attrs)
-        self.assertEqual(input, '<input class="required" required="required" size="30" type="text"/>')
-
-        attrs={"disabled": "disabled", "class": "required", "size": 30}
-        input=input_xhtml(**attrs)
-        self.assertEqual(input, '<input class="required" disabled="disabled" size="30" type="text"/>')
-
 
 class HTMLPropertyTestClass(unittest.TestCase):
     def setUp(self):
@@ -1613,7 +1595,6 @@
     def edit_check(self):
 
 def input_html4(**attrs):
-def input_xhtml(**attrs):
 
 class HTMLInputMixin:
     def __init__(self):