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-rw-r--r--tex/context/base/mkiv/catc-sym.mkiv14
1 files changed, 14 insertions, 0 deletions
diff --git a/tex/context/base/mkiv/catc-sym.mkiv b/tex/context/base/mkiv/catc-sym.mkiv
index ae1253272..64604ba35 100644
--- a/tex/context/base/mkiv/catc-sym.mkiv
+++ b/tex/context/base/mkiv/catc-sym.mkiv
@@ -55,6 +55,20 @@
.egroup
+\bgroup
+
+\catcode`_=\lettercatcode
+
+%xdef\_n_u_l_{\expandafter\string\Uchar1} % nul(l)
+%xdef\_s_o_h_{\expandafter\string\Uchar1} % start of header
+\xdef\_s_t_x_{\expandafter\string\Uchar2} % start of text
+\xdef\_e_t_x_{\expandafter\string\Uchar3} % end of text
+\xdef\_e_o_t_{\expandafter\string\Uchar4} % end of transmission
+%xdef\_e_n_q_{\expandafter\string\Uchar5} % enquiry
+%xdef\_a_c_k_{\expandafter\string\Uchar6} % aknowledgement
+
+\egroup
+
%D \macros
%D {uncatcodespecials,setnaturalcatcodes,setnormalcatcodes,
%D uncatcodecharacters,uncatcodeallcharacters,