Index: TODO
===================================================================
diff -u -r544f573ac36f1d0f9213b5ab920bc333de14e4e5 -r9246ffdfb2716a6abbf3709990abb9c4453eb461
--- TODO	(.../TODO)	(revision 544f573ac36f1d0f9213b5ab920bc333de14e4e5)
+++ TODO	(.../TODO)	(revision 9246ffdfb2716a6abbf3709990abb9c4453eb461)
@@ -2421,8 +2421,37 @@
    * make "configure --help" more pretty
    * simplify configure.in
 
+- added first version of "nsf::methoddelete"
+- extended regression test
+- updated TODO
+
 TODO:
 
+- explizites [::nsf::method delete] (sinngemäss), als ergänzung zum "{} {}"-idiom 
+  we could extend "::nsf::method obj methodname ...." towards a 
+  "::nsf::method create|destroy obj methodname ....", but this would
+  be an asymmetry for nsf::alice, nsf::forward, etc.
+
+  An option would be an ::nsf::methodelete in accoradance with methodproperty
+
+  nsfCmd methodproperty NsfMethodPropertyCmd {
+    {-argName "object" -required 1 -type object}
+    {-argName "-per-object"}
+    {-argName "methodName" -required 1 -type tclobj}
+
+- implemented above suggestion; two more issues:
+  * fix crash for non-existing per-object procs
+  * add "... method exists ...."
+  * document "nsf::methoddelete" (or find a better name for it)
+  * extend regression test
+
+- fix misleading error message:
+   nx::Class create C {
+    :public method foo {x} {return $x}
+    :public object method bar {x} {return $x}
+    :create c1
+   }
+
 - serializer: check, why catch is needed for object-level alias 
   (search for ns_cache_flush)
 - check cases of -flag=$value outside the context of nsf::procs
@@ -2432,7 +2461,7 @@
 - object parameter type forward:
    - regression test
    - reduce verbosity
-   - get rid of eager tcd creation (optimization, can go to guture releases)
+   - get rid of eager tcd creation (optimization, can go to future releases)
 
 - slotmachinerie 2
   - naming "incremental", "reconfigure"
@@ -2494,20 +2523,10 @@
    * migration guide
       3.8. Dispatch, Aliases, etc.: to be done or omitted
 
-- check performance implications of value conflict checker
+- check performance implications of value checker
 
-- explizites [::nsf::method delete] (sinngemäss), als ergänzung zum "{} {}"-idiom 
 - extend coro regression test
 
-- C-interface
-    * rework C-interface
-    * maybe for post-alpha, but we have be first clear
-      on scope and intention. A possibility would be
-      to provide all entries from gentclAPI, but we would
-      loose most likely static property and the newly
-      achieved ease of changing is effectively frozen 
-      by the stubs interface, which has to be stable.
-
 - nameing
 
     * namespace prefix 
@@ -2581,36 +2600,40 @@
 #endif
 
 
-For future releases:
+For future releases (after first alpha/beta release)
 
-   * consider alternate method name/place for subcmds (and/or slots) on classes
+   * Consider alternate method name/place for subcmds (and/or slots) on classes
      - currently, there are potentail conflicts between slots and ensemble objects
      - provide a different place in the namesspaces could simplify this
-   
-   * argument passing of C functions is currently based on an
-     interpreter of the argument lists. It should be possible to turn
-     the interpreter into a compiler to speed up argument passing. But
-     maybe, this would bloat the code-size.
 
-   * canonical reps: 
-    "p:integer,multivalued" => "-name p -type integer -multivalued"
-    "x:type,arg=::D d1" => "-name x -type type -arg ::D -default d1"
+   * Ensembles
+     - It could be possible to reduce stack frames in ensembles. Just a
+       top ensemble frame could be sufficient.
+     - The full names for ensemble methods could be stored in the cmd tables
+       to make lookup faster.
 
-   * rework implict namespace completion (NameInNamespaceObj(), 
-     maybe based on BeginOfCallChain()).
-
-   * use parameter syntax in genTclAPI
-
-   * it could be possible to reduce stack frames in ensembles. Just a
-     top ensemble frame could be sufficient.
-
-  * the full names for ensemble methods could be stored in the cmd tables
-    to make lookup faster.
-
-  * serializer: handing of xo::at_cleanup in serializer 
+  * Serializer: handing of xo::at_cleanup in serializer 
      (either generailization or move to OpenACS/aolserver init/naviserver init)
 
-  * NsfClassListAdd() and friends could be made generic
+  * Parameter/argument handling
+    - Canonical parameter representations: 
+      "p:integer,multivalued" => "-name p -type integer -multivalued"
+      "x:type,arg=::D d1" => "-name x -type type -arg ::D -default d1"
+    - Argument passing of C functions is currently based on an
+      interpreter of the argument lists. It should be possible to turn
+      the interpreter into a compiler to speed up argument passing. But
+      maybe, this would bloat the code-size.
+    - Use parameter syntax in genTclAPI
+ 
+  * C-Code
+     * Several of the tracing options in nsf.h could be replaced by DTrace
+     * Rework implict namespace completion (NameInNamespaceObj(), 
+       maybe based on BeginOfCallChain()).
+     * Rework C-interface (maybe for post-alpha, but we have be first
+       clear on scope and intention. A possibility would be to provide
+       all entries from gentclAPI, but we would loose most likely
+       static property and the newly achieved ease of changing is
+       effectively frozen by the stubs interface, which has to be
+       stable.
+     * NsfClassListAdd() and friends could be made generic
 
-  * Several of the tracing options in nsf.h could be replaced by DTrace
-
Index: generic/nsf.tcl
===================================================================
diff -u -r39306d4d36096f20dba3262638e2a87f04e90111 -r9246ffdfb2716a6abbf3709990abb9c4453eb461
--- generic/nsf.tcl	(.../nsf.tcl)	(revision 39306d4d36096f20dba3262638e2a87f04e90111)
+++ generic/nsf.tcl	(.../nsf.tcl)	(revision 9246ffdfb2716a6abbf3709990abb9c4453eb461)
@@ -37,6 +37,26 @@
     }
   }
 
+  #
+  # proc for deleting methods
+  #
+  nsf::proc ::nsf::methoddelete {object:object -per-object:switch methodName} {
+    if {${per-object}} {
+      set handle [$object ::nsf::methods::object::info::method handle $methodName]
+    } else {
+      set handle [$object ::nsf::methods::class::info::method handle $methodName]
+    }
+    if {$handle ne ""} {
+      ::nsf::method $object {*}[expr {${per-object} ? "-per-object" : ""}] $methodName "" ""
+    } else {
+      error "Object $object: method $methodName is not defined"
+    }
+  }
+
+  #
+  # The following helper proc is used e.g. in OpenACS to pair
+  # introspection with nsf::procs.
+  #
   ::proc strip_proc_name {name} {
     if {[string match ::nsf::procs::* $name]} {
       return [string range $name 12 end]
Index: generic/predefined.h
===================================================================
diff -u -r821c01bd241c51be4fa0931d423d8f8658606ee1 -r9246ffdfb2716a6abbf3709990abb9c4453eb461
--- generic/predefined.h	(.../predefined.h)	(revision 821c01bd241c51be4fa0931d423d8f8658606ee1)
+++ generic/predefined.h	(.../predefined.h)	(revision 9246ffdfb2716a6abbf3709990abb9c4453eb461)
@@ -15,6 +15,13 @@
 "eval [linsert $cmd 1 $object]} else {\n"
 "eval [linsert $(definition) 1 $object]}} else {\n"
 "error \"cannot require method $name for $object, method unknown\"}}\n"
+"nsf::proc ::nsf::methoddelete {object:object -per-object:switch methodName} {\n"
+"if {${per-object}} {\n"
+"set handle [$object ::nsf::methods::object::info::method handle $methodName]} else {\n"
+"set handle [$object ::nsf::methods::class::info::method handle $methodName]}\n"
+"if {$handle ne \"\"} {\n"
+"::nsf::method $object {*}[expr {${per-object} ? \"-per-object\" : \"\"}] $methodName \"\" \"\"} else {\n"
+"error \"Object $object: method $methodName is not defined\"}}\n"
 "::proc strip_proc_name {name} {\n"
 "if {[string match ::nsf::procs::* $name]} {\n"
 "return [string range $name 12 end]} elseif {[string match nsf::procs::* $name]} {\n"
Index: tests/method-modifiers.test
===================================================================
diff -u -rbd1cce484140aaf66113cf647f060ae48d32b24f -r9246ffdfb2716a6abbf3709990abb9c4453eb461
--- tests/method-modifiers.test	(.../method-modifiers.test)	(revision bd1cce484140aaf66113cf647f060ae48d32b24f)
+++ tests/method-modifiers.test	(.../method-modifiers.test)	(revision 9246ffdfb2716a6abbf3709990abb9c4453eb461)
@@ -361,3 +361,23 @@
   ? {c1 a b} {expected integer but got "b" for parameter "a"}  
 }
 
+#
+# Test method deletion
+#
+Test parameter count 1
+
+Test case methoddelete {
+  nx::Class create C {
+    :public method foo {x} {return $x}
+    :public class-object method bar {x} {return $x}
+    :create c1
+  }
+  
+  ? {::nsf::methoddelete C x} "Object C: method x is not defined"
+  #? {::nsf::methoddelete C -per-object x} "Object C: method x is not defined"
+  ? {::nsf::methoddelete C foo} ""
+  ? {::nsf::methoddelete C foo} "Object C: method foo is not defined"
+  ? {::nsf::methoddelete C bar} "Object C: method bar is not defined"
+  ? {::nsf::methoddelete C -per-object bar} ""
+  #? {::nsf::methoddelete C -per-object bar} ""
+}
\ No newline at end of file