register Proof_Document instances as session entities -- handle Markup.EDIT messages locally;
<?xml version="1.0"?>
<!DOCTYPE SERVICES SYSTEM "services.dtd">
<SERVICES>
<SERVICE NAME="UTF-8-Isabelle" CLASS="org.gjt.sp.jedit.io.Encoding">
new isabelle.jedit.Isabelle_Encoding();
</SERVICE>
<SERVICE NAME="isabelle" CLASS="sidekick.SideKickParser">
new isabelle.jedit.Isabelle_Sidekick();
</SERVICE>
<SERVICE NAME="isabelle" CLASS="gatchan.jedit.hyperlinks.HyperlinkSource">
new isabelle.jedit.Isabelle_Hyperlinks();
</SERVICE>
</SERVICES>