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+%D \module
+%D   [       file=strc-mar,
+%D        version=2008.10.20,
+%D          title=\CONTEXT\ Structure Macros,
+%D       subtitle=Markings,
+%D         author=Hans Hagen,
+%D           date=\currentdate,
+%D      copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
+%C
+%C This module is part of the \CONTEXT\ macro||package and is
+%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
+%C details.
+
+\writestatus{loading}{ConTeXt Structure Macros / Markings}
+
+\registerctxluafile{strc-mar-old}{autosuffix}
+
+\unprotect
+
+%D Synchronizing marks is a rather tricky and messy business. When setting a mark, a
+%D node is added to the list in order for to \TEX\ be able to figure out the 3
+%D current marks when a page is made (last mark on previous page, first on current
+%D page, last on current page; in \LUATEX\ we might at one point have the first on
+%D the next page as well).
+%D
+%D Resetting a mark is not easy. An empty one will not erase the last one on the
+%D previous page for instance. In \LUATEX\ we can clear a marks state register with
+%D \type {\clearmarks} but since this is an immediate operation it might have
+%D unwanted side effects when \TEX\ has collected several pages of text and
+%D finishing off these pages uses marks.
+%D
+%D In \MKIV\ we provide an alternative model that permits some more control over the
+%D way marks are used. It is not entirely compatible with \MKII\ or previous \MKIV\
+%D implementations but in practice this is not a real problem. It's also easier now
+%D to extend this mechanism.
+
+% first last previous next top bottom [:nocheck]
+% current
+% default page all keep
+
+\definesystemattribute [marks] [global]
+
+\installcorenamespace{marking}
+
+\installcommandhandler \??marking {marking} \??marking
+
+\newconditional\inhibitgetmarking % will become private
+\newconditional\inhibitsetmarking % will become private
+
+\newtoks       \everymarking
+
+\appendtoks
+    \clf_definemarking{\currentmarking}{\currentmarkingparent}%
+\to \everydefinemarking
+
+\permanent\protected\tolerant\def\relatemarking           [#1]#*[#2]{\clf_relatemarking{#1}{#2}}
+\permanent\protected\tolerant\def\resetmarking                  [#1]{\clf_resetmarking{#1}}
+\permanent\protected\tolerant\def\synchronizemarking[#1]#*[#2]#*[#3]{\ifvoid#2\else\clf_synchronizemarking{#1}#2{#3}\fi}
+\permanent                   \def\doifelsemarking                 #1{\clf_doifelsemarking{#1}}  % no \noexpanded
+
+\aliased\let\clearmarking\resetmarking % different in the new situation
+
+\def\strc_markings_synchronize#1#2#3{\ifvoid#2\else\clf_synchronizemarking{#1}#2{#3}\fi} % called in page-ini
+
+\permanent\protected\tolerant\def\setmarking[#1]#:#2%
+  {\ifconditional\inhibitsetmarking\else
+     \doifelse{\namedmarkingparameter{#1}\c!expansion}\v!yes
+       {\clf_setmarking{#1}{#2}}%
+       {\clf_setmarking{#1}{\detokenize{#2}}}%
+   \fi}
+
+\aliased\let\marking        \setmarking
+\aliased\let\doifmarkingelse\doifelsemarking
+
+% defaults
+
+\setupmarking
+  [\c!expansion=\v!no,
+   \c!separator=\space\emdash\space,
+   \c!filtercommand=\firstofoneargument,
+   \c!state=\v!start]
+
+% fetching, regular interface
+
+\permanent\protected\def\getmarking
+  {\ifconditional\inhibitgetmarking
+     \expandafter\strc_markings_get_nop
+   \else
+     \expandafter\strc_markings_get_yes
+   \fi}
+
+\tolerant\def\strc_markings_get_nop[#-]#*[#-]#*[#-]%
+  {}
+
+\tolerant\def\strc_markings_get_yes[#1]#*[#2]#*[#3]%
+  {\ifcstok{\namedmarkingparameter{#1}\c!state}\v!start
+     \begingroup
+     \setsystemmode\v!marking
+     \the\everymarking
+     \ifparameter#3\or
+       \clf_getmarking{#1}{#2}{#3}%
+     \else
+       \clf_getmarking{#1}{\v!page}{#2}%
+     \fi
+     \endgroup
+  \fi}
+
+% the fetchers are fully expandable: [name][method]
+
+\permanent\tolerant\def\fetchonemark[#1]#*[#2]{\ifconditional\inhibitgetmarking\else\clf_fetchonemark {#1}{\v!page}{#2}\fi}
+\permanent\tolerant\def\fetchtwomarks     [#1]{\ifconditional\inhibitgetmarking\else\clf_fetchtwomarks{#1}{\v!page}\fi}
+\permanent\tolerant\def\fetchallmarks     [#1]{\ifconditional\inhibitgetmarking\else\clf_fetchallmarks{#1}{\v!page}\fi}
+
+\aliased\let\fetchmark\fetchonemark
+
+% also fully expandable but here we have: [name][range][method]
+
+\permanent\tolerant\def\fetchonemarking[#1]#*[#2]#*[#3]{\ifconditional\inhibitgetmarking\else\clf_fetchonemark {#1}{#2}{#3}\fi}
+\permanent\tolerant\def\fetchtwomarkings     [#1]#*[#2]{\ifconditional\inhibitgetmarking\else\clf_fetchtwomarks{#1}{#2}\fi}
+\permanent\tolerant\def\fetchallmarkings     [#1]#*[#2]{\ifconditional\inhibitgetmarking\else\clf_fetchallmarks{#1}{#2}\fi}
+
+\aliased\let\fetchmarking\fetchonemarking
+
+\permanent\def\markingseparator#1{\namedmarkingparameter{#1}\c!separator}
+\permanent\def\markingcommand  #1{\namedmarkingparameter{#1}\c!filtercommand}
+
+%D Experimental:
+%D
+%D \starttyping
+%D \definemarking[boxmark]
+%D
+%D \setbox0\ruledvbox{
+%D     \marking[boxmark]{tufte} \input tufte \par
+%D     \marking[boxmark]{ward}  \input ward  \par
+%D }
+%D
+%D \synchronizemarking[zerobox][0] \box0
+%D
+%D marks: (\getmarking[boxmark][zerobox][first],\getmarking[boxmark][zerobox][last])
+%D \stoptyping
+
+\protect \endinput