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+%D \module
+%D   [       file=prop-run,
+%D        version=2003.04.20,
+%D          title=\CONTEXT\ Property Macros,
+%D       subtitle=Runtime Macros,
+%D         author=Hans Hagen,
+%D           date=\currentdate,
+%D      copyright={PRAGMA / Hans Hagen \& Ton Otten}]
+%C
+%C This module is part of the \CONTEXT\ macro||package and is
+%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
+%C details.
+
+\unprotect
+
+\doglobal\newif\ifshowcomponents
+
+\gdef\showlayoutcomponents
+  {\showcomponentstrue}
+
+% By postponing loading of the next two macro's till their usage, we
+% don't put a burden on the system when they are not used.
+
+\gdef\startlayoutcomponent#1#2%
+  {\ifshowcomponents
+     \doifelseproperty{#1}
+        \donothing
+       {\doifelsenothing{#2}%
+          {\defineproperty[#1][\s!layer]}% [\c!title=#1]
+          {\defineproperty[#1][\s!layer][\c!title=#2]}}%
+     \startproperty[#1]%
+   \fi}
+
+\gdef\stoplayoutcomponent
+  {\ifshowcomponents
+     \stopproperty
+   \fi}
+
+\protect \endinput