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+get_directory_property
+----------------------
+
+Get a property of DIRECTORY scope.
+
+::
+
+  get_directory_property(<variable> [DIRECTORY <dir>] <prop-name>)
+
+Store a property of directory scope in the named variable.  If the
+property is not defined the empty-string is returned.  The DIRECTORY
+argument specifies another directory from which to retrieve the
+property value.  The specified directory must have already been
+traversed by CMake.
+
+::
+
+  get_directory_property(<variable> [DIRECTORY <dir>]
+                         DEFINITION <var-name>)
+
+Get a variable definition from a directory.  This form is useful to
+get a variable definition from another directory.
+
+See also the more general get_property() command.