receovered alternative abbrevs for \<open> \<close> from 8e8243975860, to accommodate national keyboard layouts where "`" might be hard to produce;
--- a/etc/symbols Sat May 24 12:55:09 2014 +0200
+++ b/etc/symbols Sat May 24 12:58:22 2014 +0200
@@ -348,8 +348,8 @@
\<hungarumlaut> code: 0x0002dd
\<some> code: 0x0003f5
\<newline> code: 0x0023ce
-\<open> code: 0x002039 group: punctuation font: IsabelleText
-\<close> code: 0x00203a group: punctuation font: IsabelleText
+\<open> code: 0x002039 group: punctuation font: IsabelleText abbrev: <<
+\<close> code: 0x00203a group: punctuation font: IsabelleText abbrev: >>
\<here> code: 0x002302 font: IsabelleText
\<^sub> code: 0x0021e9 group: control font: IsabelleText
\<^sup> code: 0x0021e7 group: control font: IsabelleText