From a136880555e7e4ff722b33bfa90d7bc5c9ef6f42 Mon Sep 17 00:00:00 2001
From: jenglish <jenglish@flightlab.com>
Date: Tue, 15 Apr 2003 19:50:34 +0000
Subject: Added example section "SCOPED SCRIPTS", supplied by Kevin Kenny.
 (Fixes [Bug 219183])

---
 ChangeLog       |  4 ++++
 doc/namespace.n | 28 ++++++++++++++++++++++++++--
 2 files changed, 30 insertions(+), 2 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 4d7248e..49f4224 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2003-04-15  Joe English  <jenglish@users.sourceforge.net>
+	* doc/namespace.n: added example section "SCOPED SCRIPTS",
+	supplied by Kevin Kenny. (Fixes [Bug 219183])
+
 2003-04-15  Kevin Kenny  <kennykb@acm.org>
 
 	* makefile.vc: Updated makefile.vc to conform with Mo DeJong's
diff --git a/doc/namespace.n b/doc/namespace.n
index c79ce08..932cdaa 100644
--- a/doc/namespace.n
+++ b/doc/namespace.n
@@ -6,7 +6,7 @@
 '\" See the file "license.terms" for information on usage and redistribution
 '\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 '\" 
-'\" RCS: @(#) $Id: namespace.n,v 1.9 2003/01/21 20:06:11 jenglish Exp $
+'\" RCS: @(#) $Id: namespace.n,v 1.10 2003/04/15 19:50:37 jenglish Exp $
 '\" 
 .so man.macros
 .TH namespace n 8.0 Tcl "Tcl Built-In Commands"
@@ -66,7 +66,7 @@ extensions like Tk normally execute callback scripts
 in the global namespace.
 A scoped command captures a command together with its namespace context
 in a way that allows it to be executed properly later.
-See the section \fBSCOPED VALUES\fR for some examples
+See the section \fBSCOPED SCRIPTS\fR for some examples
 of how this is used to create callback scripts.
 .TP
 \fBnamespace current\fR
@@ -568,6 +568,30 @@ may be imported by other namespaces.
 If a \fBnamespace import\fR command specifies a command
 that is not exported, the command is not imported.
 
+.SH "SCOPED SCRIPTS"
+The \fBnamespace code\fP command is the means by which a script may be
+packaged for evaluation in a namespace other than the one in which it
+was created.  It is used most often to create event handlers, Tk bindings,
+and traces for evaluation in the global context.  For instance, the following
+code indicates how to direct a variable trace callback into the current
+namespace:
+.CS
+namespace eval a {
+    variable b
+    proc theTraceCallback { n1 n2 op } {
+       upvar 1 $n1 var
+       puts "the value of $n1 has changed to $var"
+       return
+    }
+    trace variable b w [namespace code theTraceCallback]
+}
+set a::b c
+.CE
+When executed, it prints the message:
+.CS
+the value of a::b has changed to c
+.CE
+
 .SH "SEE ALSO"
 variable(n)
 
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