Index: openacs-4/packages/xotcl-core/tcl/01-debug-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xotcl-core/tcl/01-debug-procs.tcl,v
diff -u -r1.93.2.3 -r1.93.2.4
--- openacs-4/packages/xotcl-core/tcl/01-debug-procs.tcl	30 Apr 2019 18:50:10 -0000	1.93.2.3
+++ openacs-4/packages/xotcl-core/tcl/01-debug-procs.tcl	23 Jul 2019 16:51:49 -0000	1.93.2.4
@@ -464,7 +464,7 @@
   #proc ::xo::at_create {} {
   #  ns_log notice "--at_create *********"
   #  foreach i [::xo::InstanceManager array names blueprint] {
-  #    if {![::xotcl::Object isobject $i]} {
+  #    if {![nsf::is object $i]} {
   #      ::xo::InstanceManager unset blueprint($i)
   #      ns_log notice "--at_create no such object: $i"
   #    }
@@ -483,7 +483,7 @@
     set at_end ""
     foreach {name cmd} [array get ::xo::cleanup] {
       #::trace remove variable ::xotcl_cleanup($name) unset ::xo::cleanup
-      if {![::xotcl::Object isobject $name]} {
+      if {![nsf::is object $name]} {
         #ns_log notice "--D $name already destroyed, nothing to do"
         continue
       }
@@ -499,7 +499,7 @@
         ns_log error "Error during ::xo::cleanup: $errorMsg $::errorInfo"
         try {
           ns_log notice "... analyze: cmd = $cmd"
-          ns_log notice "... analyze: $obj is_object? [::xotcl::Object isobject $obj]"
+          ns_log notice "... analyze: $obj is_object? [nsf::is object $obj]"
           ns_log notice "... analyze: class [$obj info class]"
           ns_log notice "... analyze: precedence [$obj info precedence]"
           ns_log notice "... analyze: methods [lsort [$obj info methods]]"
@@ -565,12 +565,12 @@
       set objs [::xotcl::Object allinstances]
       ns_log notice "no finalize available, deleting [llength $objs] objects"
       foreach o $objs {
-        if {![::xotcl::Object isobject $o]} continue
+        if {![nsf::is object $o]} continue
         if {[$o istype ::xotcl::Class]} continue
         catch {$o destroy} errorMsg
       }
       foreach o [::xotcl::Class allinstances] {
-        if {![::xotcl::Object isobject $o]} continue
+        if {![nsf::is object $o]} continue
         if {$o eq "::xotcl::Object" || $o eq "::xotcl::Class"} continue
         catch {$o destroy} errorMsg
       }
@@ -1002,7 +1002,7 @@
 
   # search for slot
   foreach c [:info heritage] {
-    if {[info commands ${c}::slot::$name] ne ""} {
+    if {[nsf::is object ${c}::slot::$name]} {
       set slot ${c}::slot::$name
       break
     }
Index: openacs-4/packages/xotcl-core/tcl/05-db-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xotcl-core/tcl/05-db-procs.tcl,v
diff -u -r1.148.2.11 -r1.148.2.12
--- openacs-4/packages/xotcl-core/tcl/05-db-procs.tcl	4 Jul 2019 18:07:48 -0000	1.148.2.11
+++ openacs-4/packages/xotcl-core/tcl/05-db-procs.tcl	23 Jul 2019 16:51:49 -0000	1.148.2.12
@@ -1690,7 +1690,7 @@
       }
 
       set class_name ::xo::db::sql::[string tolower $package_name]
-      if {![:isobject $class_name]} {
+      if {![nsf::is object $class_name]} {
         ::xo::db::Class create $class_name
       } elseif {![$class_name istype ::xo::db::Class]} {
         #
@@ -1751,7 +1751,7 @@
 
   # Installations with acs-kernel prior to 5.8.1a6 (or later, before running upgrade script)
   # won't have these procs. We define them here if missing to avoid breaking running instances during transition.
-  if {![::xotcl::Class isobject "::xo::db::sql::util"]} {
+  if {![nsf::is object "::xo::db::sql::util"]} {
     ::xotcl::Class create ::xo::db::sql::util
     if {[::xo::db::sql::util info commands table_exists] eq ""} {
       ::xo::db::sql::util ad_proc table_exists {-name:required} {Transitional method} {
Index: openacs-4/packages/xotcl-core/tcl/06-package-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xotcl-core/tcl/06-package-procs.tcl,v
diff -u -r1.41.2.5 -r1.41.2.6
--- openacs-4/packages/xotcl-core/tcl/06-package-procs.tcl	4 Jul 2019 18:11:46 -0000	1.41.2.5
+++ openacs-4/packages/xotcl-core/tcl/06-package-procs.tcl	23 Jul 2019 16:51:49 -0000	1.41.2.6
@@ -173,9 +173,9 @@
       error "package_id must not be empty"
     }
 
-    #:log "--R $package_id exists? [:isobject ::$package_id] url='$url'"
+    #:log "--R $package_id exists? [nsf::is object ::$package_id] url='$url'"
 
-    if {![:isobject ::$package_id]} {
+    if {![nsf::is object ::$package_id]} {
       #:log "--R we have to create ::$package_id //url='$url'"
       #
       # To make initialization code generic, we obtain from the
Index: openacs-4/packages/xotcl-core/tcl/20-Ordered-Composite-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xotcl-core/tcl/20-Ordered-Composite-procs.tcl,v
diff -u -r1.27.2.3 -r1.27.2.4
--- openacs-4/packages/xotcl-core/tcl/20-Ordered-Composite-procs.tcl	8 May 2019 14:30:45 -0000	1.27.2.3
+++ openacs-4/packages/xotcl-core/tcl/20-Ordered-Composite-procs.tcl	23 Jul 2019 16:54:51 -0000	1.27.2.4
@@ -80,7 +80,7 @@
     if {[info exists :__children]} {
       #:log "--W destroying children ${:__children}"
       foreach c ${:__children} { 
-        if {[:isobject $c]} {$c destroy}
+        if {[nsf::is object $c]} {$c destroy}
       }
     }
     #show_stack;:log "--W children murdered, now next, chlds=[:info children]"
Index: openacs-4/packages/xotcl-core/tcl/30-widget-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xotcl-core/tcl/30-widget-procs.tcl,v
diff -u -r1.70.2.4 -r1.70.2.5
--- openacs-4/packages/xotcl-core/tcl/30-widget-procs.tcl	4 Jul 2019 18:08:53 -0000	1.70.2.4
+++ openacs-4/packages/xotcl-core/tcl/30-widget-procs.tcl	23 Jul 2019 16:54:51 -0000	1.70.2.5
@@ -692,8 +692,8 @@
   }
 
   TABLE instproc render {} {
-    if {![:isobject [self]::__actions]} {:actions {}}
-    if {![:isobject [self]::__bulkactions]} {:bulkactions {}}
+    if {![nsf::is object [self]::__actions]} {:actions {}}
+    if {![nsf::is object [self]::__bulkactions]} {:bulkactions {}}
     set bulkactions [[self]::__bulkactions children]
     if {$bulkactions eq ""} {
       html::table -class ${:css.table-class} {
@@ -876,8 +876,8 @@
         }
       } \
       -instproc render {} {
-        if {![:isobject [self]::__actions]} {:actions {}}
-        if {![:isobject [self]::__bulkactions]} {:__bulkactions {}}
+        if {![nsf::is object [self]::__actions]} {:actions {}}
+        if {![nsf::is object [self]::__bulkactions]} {:__bulkactions {}}
         set bulkactions [[self]::__bulkactions children]
         html::div  {
           :render-actions
Index: openacs-4/packages/xotcl-core/tcl/bgdelivery-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xotcl-core/tcl/bgdelivery-procs.tcl,v
diff -u -r1.68.2.9 -r1.68.2.10
--- openacs-4/packages/xotcl-core/tcl/bgdelivery-procs.tcl	23 Jul 2019 12:35:29 -0000	1.68.2.9
+++ openacs-4/packages/xotcl-core/tcl/bgdelivery-procs.tcl	23 Jul 2019 16:56:01 -0000	1.68.2.10
@@ -537,7 +537,7 @@
     #ns_log notice "expires-set $filename"
     #ns_log notice "status_code = $status_code, filename=$filename"
 
-    if {![:isobject ::xo::cc]} {
+    if {![nsf::is object ::xo::cc]} {
       ::xo::ConnectionContext require
     }
     set query [::xo::cc actual_query]
@@ -750,7 +750,7 @@
 
   } {
     if {$query eq ""} {
-      if {![::xotcl::Object isobject ::xo::cc]} {
+      if {![nsf::is object ::xo::cc]} {
         ::xo::ConnectionContext require
       }
       set query [::xo::cc actual_query]
Index: openacs-4/packages/xotcl-core/tcl/context-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xotcl-core/tcl/context-procs.tcl,v
diff -u -r1.75.2.4 -r1.75.2.5
--- openacs-4/packages/xotcl-core/tcl/context-procs.tcl	4 Jul 2019 18:09:42 -0000	1.75.2.4
+++ openacs-4/packages/xotcl-core/tcl/context-procs.tcl	23 Jul 2019 16:56:01 -0000	1.75.2.5
@@ -227,7 +227,7 @@
                                   {-actual_query " "}
                                   {-keep_cc false}
                                 } {
-    set exists_cc [:isobject ::xo::cc]
+    set exists_cc [nsf::is object ::xo::cc]
 
     # if we have a connection context and we want to keep it, do
     # nothing and return.
Index: openacs-4/packages/xotcl-core/tcl/cr-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xotcl-core/tcl/cr-procs.tcl,v
diff -u -r1.76.2.20 -r1.76.2.21
--- openacs-4/packages/xotcl-core/tcl/cr-procs.tcl	17 Jul 2019 11:46:23 -0000	1.76.2.20
+++ openacs-4/packages/xotcl-core/tcl/cr-procs.tcl	23 Jul 2019 16:56:01 -0000	1.76.2.21
@@ -103,7 +103,7 @@
     @return parent_id
   } {
     # TODO: the following line is deactivated, until we get rid of the "folder object" in xowiki
-    #if {[:isobject ::$item_id]} {return [::$item_id parent_id]}
+    #if {[nsf::is object ::$item_id]} {return [::$item_id parent_id]}
     ::xo::dc 1row -prepare integer get_parent "select parent_id from cr_items where item_id = :item_id"
     return $parent_id
   }
@@ -118,7 +118,7 @@
     @return parent_id
   } {
     # TODO: the following line is deactivated, until we get rid of the "folder object" in xowiki
-    #if {[:isobject ::$item_id]} {return [::$item_id parent_id]}
+    #if {[nsf::is object ::$item_id]} {return [::$item_id parent_id]}
     ::xo::dc 1row -prepare integer get_name "select name from cr_items where item_id = :item_id"
     return $name
   }
@@ -435,7 +435,7 @@
     @return cr item object
   } {
     # :log "-- generic fetch_object [self args]"
-    if {![::xotcl::Object isobject $object]} {
+    if {![nsf::is object $object]} {
       # if the object does not yet exist, we have to create it
       :create $object
     }
@@ -549,7 +549,7 @@
     @return fully qualified object
   } {
     set object ::[expr {$revision_id ? $revision_id : $item_id}]
-    if {![:isobject $object]} {
+    if {![nsf::is object $object]} {
       :fetch_object -object $object \
           -item_id $item_id -revision_id $revision_id \
           -initialize $initialize
@@ -916,7 +916,7 @@
   }
 
   CrItem instproc current_user_id {} {
-    if {[:isobject ::xo::cc]} {return [::xo::cc user_id]}
+    if {[nsf::is object ::xo::cc]} {return [::xo::cc user_id]}
     if {[ad_conn isconnected]}  {return [ad_conn user_id]}
     return ""
   }
@@ -1517,7 +1517,7 @@
     "standard naming convention". Instead we create them as ::cr_folder<acs_object_id>
   } {
     set object ::$item_id
-    if {![:isobject $object]} {
+    if {![nsf::is object $object]} {
       :fetch_object -object $object -item_id $item_id -initialize $initialize
       $object destroy_on_cleanup
     }
@@ -1551,7 +1551,7 @@
     all attributes. The revision_id is completely ignored.
     @see CrClass fetch_object
   } {
-    if {![::xotcl::Object isobject $object]} {
+    if {![nsf::is object $object]} {
       :create $object
     }
 
@@ -1577,7 +1577,7 @@
                         -creation_user $creation_user \
                         -creation_ip $creation_ip]
     #parent_s has_child_folders attribute could have become outdated
-    if { [:isobject ::${:parent_id}] } {
+    if { [nsf::is object ::${:parent_id}] } {
       ::${:parent_id} set has_child_folders t
     }
     # well, obtaining the allowed content_types this way is not very
@@ -1654,7 +1654,7 @@
       # The variable serialized_object contains the serialization of
       # the object from the cache; check if the object exists already
       # or create it.
-      if {[:isobject $object]} {
+      if {[nsf::is object $object]} {
         # There would have been no need to call this method. We could
         # raise an error here.
         # :log "--!! $object exists already"
Index: openacs-4/packages/xotcl-core/tcl/generic-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xotcl-core/tcl/generic-procs.tcl,v
diff -u -r1.112.2.2 -r1.112.2.3
--- openacs-4/packages/xotcl-core/tcl/generic-procs.tcl	4 Jul 2019 18:10:50 -0000	1.112.2.2
+++ openacs-4/packages/xotcl-core/tcl/generic-procs.tcl	23 Jul 2019 16:56:01 -0000	1.112.2.3
@@ -120,7 +120,7 @@
   }
 
   Form instproc request {privilege} {
-    if {[:isobject ::${:package_id}] && ![::${:package_id} exists policy]} {
+    if {[nsf::is object ::${:package_id}] && ![::${:package_id} exists policy]} {
       # not needed, if governed by a policy
       auth::require_login
       permission::require_permission \
Index: openacs-4/packages/xotcl-core/tcl/policy-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xotcl-core/tcl/policy-procs.tcl,v
diff -u -r1.29.2.2 -r1.29.2.3
--- openacs-4/packages/xotcl-core/tcl/policy-procs.tcl	4 Jul 2019 18:11:46 -0000	1.29.2.2
+++ openacs-4/packages/xotcl-core/tcl/policy-procs.tcl	23 Jul 2019 16:56:53 -0000	1.29.2.3
@@ -100,9 +100,9 @@
     set permission ""
     set o [self]::[namespace tail $object]
     set key require_permission($method)
-    if {[:isobject $o] && [$o exists $key]} {
+    if {[nsf::is object $o] && [$o exists $key]} {
       set permission [$o set $key]
-    } elseif {[:isobject $o] && [$o exists default_permission]} {
+    } elseif {[nsf::is object $o] && [$o exists default_permission]} {
       set permission [$o set default_permission]
     } elseif {$check_classes} {
       # we have no object specific policy information, check the classes
Index: openacs-4/packages/xotcl-core/tcl/test/xotcl-core-db-tutorial-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xotcl-core/tcl/test/xotcl-core-db-tutorial-procs.tcl,v
diff -u -r1.1.2.1 -r1.1.2.2
--- openacs-4/packages/xotcl-core/tcl/test/xotcl-core-db-tutorial-procs.tcl	20 Mar 2019 20:48:48 -0000	1.1.2.1
+++ openacs-4/packages/xotcl-core/tcl/test/xotcl-core-db-tutorial-procs.tcl	23 Jul 2019 16:56:53 -0000	1.1.2.2
@@ -19,14 +19,14 @@
 
     set id [$o object_id]
     aa_true "'$o' has a matching object_id" [regexp "^::$id\$" $o]
-    aa_true "$o is an abject" [::xotcl::Object isobject $o]
+    aa_true "$o is an abject" [nsf::is object $o]
 
     $o destroy
-    aa_false "$o is not an abject anymore" [::xotcl::Object isobject $o]
+    aa_false "$o is not an abject anymore" [nsf::is object $o]
 
     # Load the persisted object from the DB
     set o [::xo::db::Class get_instance_from_db -id $id]
-    aa_true "$o is again an abject" [::xotcl::Object isobject $o]
+    aa_true "$o is again an abject" [nsf::is object $o]
 
     # Check, of object exists in the DB
     aa_true "$o exists in the DB" [::xo::db::Class exists_in_db -id $id]
@@ -86,7 +86,7 @@
 
     aa_true "'$p' looks like a valid object name" [regexp {^::\d+$} $p]
 
-    aa_true "object $p exists in memory" [::xotcl::Object isobject $p]
+    aa_true "object $p exists in memory" [nsf::is object $p]
     set id [$p object_id]
     aa_true "bject $p exists in the db"  [::xo::db::Class exists_in_db -id $id]