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%D \module
%D [ file=attr-lay,
%D version=2007.06.06,
%D title=\CONTEXT\ Attribute Macros,
%D subtitle=Viewerlayers,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright=PRAGMA-ADE]
%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 Attribute Macros / Viewerlayers}
\unprotect
\registerctxluafile{attr-lay}{1.001}
% needs to work over stopitemize grouping etc
\def\registerviewerlayer#1#2% global !
{\setxvalue{(vl:#1)}{\global\attribute\viewerlayerattribute\ctxlua{tex.write(attributes.viewerlayers.register('#2'))} }}
\setevalue{(vl:)}{\global\attribute\viewerlayerattribute\attributeunsetvalue}
\def\dotriggerviewerlayer % move to lua
{\ctxlua{attributes.viewerlayers.enable()}%
\gdef\dotriggerviewerlayer##1{\csname(vl:##1)\endcsname}%
\dotriggerviewerlayer}
\protect \endinput
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