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-rw-r--r--tex/context/base/mult-sys.mkiv7
1 files changed, 7 insertions, 0 deletions
diff --git a/tex/context/base/mult-sys.mkiv b/tex/context/base/mult-sys.mkiv
index 8c1bff2bc..9b75f332f 100644
--- a/tex/context/base/mult-sys.mkiv
+++ b/tex/context/base/mult-sys.mkiv
@@ -538,6 +538,13 @@
\defineinterfacevariable {c} {c}
\defineinterfacevariable {d} {d}
+%D For tagging:
+
+\definesystemconstant {subtype}
+\definesystemconstant {top}
+\definesystemconstant {bottom}
+\definesystemconstant {both}
+
%D Special purpose variables:
\def\v!oddeven#1{\ifodd#1\v!odd\else\v!even\fi}