Add RFC 9253 compatibility

CHANGES.rst

@@ -32,6 +32,16 @@ Breaking changes:
 
 New features:
 
+- Add compatibility to :rfc:`9253`:
+
+  - Add new property types :class:`vUid` and :class:`vXmlReference`.
+  - Add properties to all components: :attr:`Component.concepts`, :attr:`Component.links`, :attr:`Component.refids`, :attr:`Component.related_to`.
+  - Add new values to :class:`icalendar.enum.RELTYPE`.
+  - Add ``LABEL``, ``GAP``, and ``VALUE`` parameter to property values affected by :rfc:`9253`.
+
+- Allow setting default values in :class:`icalendar.parser.Parameters`.
+- Allow ``None`` as an argument to :class:`icalendar.parser.Parameters`.
+- Add ``ical_value`` to several property values, see `Issue 876 <https://github.com/collective/icalendar/issues/876>`_.
 - Add PyData Theme version switcher to documentation. See `Issue 825 <https://github.com/collective/icalendar/issues/825>`_.
 - Test compatibility with Python 3.14. See `Issue 973 <https://github.com/collective/icalendar/issues/973>`_.
 - Added documentation of Vale usage for icalender documentation style guide. See `Issue 815 <https://github.com/collective/icalendar/issues/815>`_.
@@ -40,7 +50,7 @@ New features:
 
 Bug fixes:
 
-- ...
+- Make sure a component's ``conferences`` property adds ``VALUE=URI`` if the conference is created as a URI.
 
 6.3.2 (2025-11-03)
 ------------------

docs/conf.py

@@ -19,6 +19,7 @@
     "sphinx.ext.intersphinx",
     "sphinx.ext.autosectionlabel",
     "sphinx.ext.napoleon",
+    "sphinx_autodoc_typehints",
 ]
 source_suffix = {".rst": "restructuredtext"}
 master_doc = "index"
@@ -121,6 +122,7 @@
     r"https://pypi.org/manage/project/icalendar/collaboration/",
     # Ignore specific anchors
     r"https://github.com/collective/icalendar/blob/main/README.rst#related-projects",
+    r"https://www.unicode.org/cldr/cldr-aux/charts/29/supplemental/zone_tzid.html",
 ]
 linkcheck_anchors = True
 linkcheck_timeout = 5

docs/reference/design.rst

@@ -25,14 +25,14 @@ icalendar is compatible with the following RFC standards.
     Calendar Availability
 :rfc:`7986`
     New Properties for iCalendar
+:rfc:`9253`
+    Support for iCalendar Relationships
 
 The maintainers of icalendar do not claim compatibility with the following RFCs.
 They might work though.
 
 :rfc:`9073`
     Event Publishing Extensions to iCalendar
-:rfc:`9253`
-    Support for iCalendar Relationships
 
 
 iCalendar file structure

pyproject.toml

@@ -233,5 +233,6 @@ docs = [
     "sphinx-design>=0.5.0",
     "sphinx-reredirects>=0.1.6",
     "vale>=3.12.0",
+    "sphinx-autodoc-typehints", 
 ]
 

src/icalendar/__init__.py

@@ -70,9 +70,11 @@
     vSkip,
     vText,
     vTime,
+    vUid,
     vUri,
     vUTCOffset,
     vWeekday,
+    vXmlReference,
 )
 from icalendar.prop.conference import Conference
 from icalendar.prop.image import Image
@@ -147,8 +149,10 @@
     "vText",
     "vTime",
     "vUTCOffset",
+    "vUid",
     "vUri",
     "vWeekday",
+    "vXmlReference",
     "version",
     "version_tuple",
 ]