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+CXX_MODULE_HEADER_UNIT_SET_<NAME>
+---------------------------------
+
+.. note ::
+
+ Experimental. Gated by ``CMAKE_EXPERIMENTAL_CXX_MODULE_CMAKE_API``
+
+Semicolon-separated list of files in the target's ``<NAME>`` C++ module header
+set, which has the set type ``CXX_MODULE_HEADER_UNITS``. If any of the paths
+are relative, they are computed relative to the target's source directory. The
+property supports
+:manual:`generator expressions <cmake-generator-expressions(7)>`.
+
+This property is normally only set by :command:`target_sources(FILE_SET)`
+rather than being manipulated directly.
+
+See :prop_tgt:`CXX_MODULE_HEADER_UNIT_SET` for the list of files in the
+default C++ module header set. See :prop_tgt:`CXX_MODULE_HEADER_UNIT_SETS` for
+the file set names of all C++ module header sets.