Index: library/nx/nx.tcl
===================================================================
diff -u -rcb51d32138200e01405bb373e5dbdd4e7c1a0c0c -r99993215e25c11fa8c1467f4ee5cfd1dc71c250e
--- library/nx/nx.tcl	(.../nx.tcl)	(revision cb51d32138200e01405bb373e5dbdd4e7c1a0c0c)
+++ library/nx/nx.tcl	(.../nx.tcl)	(revision 99993215e25c11fa8c1467f4ee5cfd1dc71c250e)
@@ -935,11 +935,11 @@
     #puts stderr "... objectparameter [::nsf::self]"
     set parameterdefinitions [::nsf::parametersfromslots [::nsf::self]]
     if {[::nsf::is class [::nsf::self]]} {
-      lappend parameterdefinitions -attributes:method,optional
+      lappend parameterdefinitions -attributes:method
     }
     lappend parameterdefinitions \
-        -noinit:method,optional,noarg \
-        -volatile:method,optional,noarg \
+        -noinit:method,noarg \
+        -volatile:method,noarg \
         {*}$lastparameter
     #puts stderr "*** parameter definition for [::nsf::self]: $parameterdefinitions"
     return $parameterdefinitions
Index: tests/parameters.test
===================================================================
diff -u -r934bc8782f74d5d8c8ee8edb41c0abf7e229158a -r99993215e25c11fa8c1467f4ee5cfd1dc71c250e
--- tests/parameters.test	(.../parameters.test)	(revision 934bc8782f74d5d8c8ee8edb41c0abf7e229158a)
+++ tests/parameters.test	(.../parameters.test)	(revision 99993215e25c11fa8c1467f4ee5cfd1dc71c250e)
@@ -249,13 +249,13 @@
   C create c1
  
   ? {C eval {:objectparameter}} \
-      "-object-mixin:relation,slot=::nx::Class::slot::object-mixin -mixin:relation,arg=class-mixin,slot=::nx::Class::slot::mixin -superclass:relation,slot=::nx::Class::slot::superclass -object-filter:relation,slot=::nx::Class::slot::object-filter -filter:relation,arg=class-filter,slot=::nx::Class::slot::filter -attributes:method,optional -noinit:method,optional,noarg -volatile:method,optional,noarg __initcmd:initcmd,optional"
+      "-object-mixin:relation,slot=::nx::Class::slot::object-mixin -mixin:relation,arg=class-mixin,slot=::nx::Class::slot::mixin -superclass:relation,slot=::nx::Class::slot::superclass -object-filter:relation,slot=::nx::Class::slot::object-filter -filter:relation,arg=class-filter,slot=::nx::Class::slot::filter -attributes:method -noinit:method,noarg -volatile:method,noarg __initcmd:initcmd,optional"
 
 
 
 
   ? {c1 eval {:objectparameter}} \
-      "-a:slot=::C::slot::a -b:boolean,slot=::C::slot::b {-c:slot=::C::slot::c 1} -mixin:relation,arg=object-mixin,slot=::nx::Object::slot::mixin -filter:relation,arg=object-filter,slot=::nx::Object::slot::filter -noinit:method,optional,noarg -volatile:method,optional,noarg __initcmd:initcmd,optional"
+      "-a:slot=::C::slot::a -b:boolean,slot=::C::slot::b {-c:slot=::C::slot::c 1} -mixin:relation,arg=object-mixin,slot=::nx::Object::slot::mixin -filter:relation,arg=object-filter,slot=::nx::Object::slot::filter -noinit:method,noarg -volatile:method,noarg __initcmd:initcmd,optional"
 }
 
 #######################################################
@@ -268,13 +268,13 @@
 
   c1 class Object
   ? {c1 eval :objectparameter} \
-      "-mixin:relation,arg=object-mixin,slot=::nx::Object::slot::mixin -filter:relation,arg=object-filter,slot=::nx::Object::slot::filter -noinit:method,optional,noarg -volatile:method,optional,noarg __initcmd:initcmd,optional"
+      "-mixin:relation,arg=object-mixin,slot=::nx::Object::slot::mixin -filter:relation,arg=object-filter,slot=::nx::Object::slot::filter -noinit:method,noarg -volatile:method,noarg __initcmd:initcmd,optional"
   
   Class create D -superclass C -attributes {d:required}
   D create d1 -d 100
   
   ? {d1 eval :objectparameter} \
-      "-d:required,slot=::D::slot::d -a:slot=::C::slot::a -b:boolean,slot=::C::slot::b {-c:slot=::C::slot::c 1} -mixin:relation,arg=object-mixin,slot=::nx::Object::slot::mixin -filter:relation,arg=object-filter,slot=::nx::Object::slot::filter -noinit:method,optional,noarg -volatile:method,optional,noarg __initcmd:initcmd,optional"
+      "-d:required,slot=::D::slot::d -a:slot=::C::slot::a -b:boolean,slot=::C::slot::b {-c:slot=::C::slot::c 1} -mixin:relation,arg=object-mixin,slot=::nx::Object::slot::mixin -filter:relation,arg=object-filter,slot=::nx::Object::slot::filter -noinit:method,noarg -volatile:method,noarg __initcmd:initcmd,optional"
 }
 
 #######################################################
@@ -290,27 +290,27 @@
   Class create M2 -attributes {b2}
   D mixin M
   ? {d1 eval :objectparameter} \
-      "-b:slot=::M::slot::b -m1:slot=::M::slot::m1 -m2:slot=::M::slot::m2 -d:required,slot=::D::slot::d -a:slot=::C::slot::a {-c:slot=::C::slot::c 1} -mixin:relation,arg=object-mixin,slot=::nx::Object::slot::mixin -filter:relation,arg=object-filter,slot=::nx::Object::slot::filter -noinit:method,optional,noarg -volatile:method,optional,noarg __initcmd:initcmd,optional" \
+      "-b:slot=::M::slot::b -m1:slot=::M::slot::m1 -m2:slot=::M::slot::m2 -d:required,slot=::D::slot::d -a:slot=::C::slot::a {-c:slot=::C::slot::c 1} -mixin:relation,arg=object-mixin,slot=::nx::Object::slot::mixin -filter:relation,arg=object-filter,slot=::nx::Object::slot::filter -noinit:method,noarg -volatile:method,noarg __initcmd:initcmd,optional" \
     "mixin added"
   M mixin M2
   ? {d1 eval :objectparameter} \
-      "-b2:slot=::M2::slot::b2 -b:slot=::M::slot::b -m1:slot=::M::slot::m1 -m2:slot=::M::slot::m2 -d:required,slot=::D::slot::d -a:slot=::C::slot::a {-c:slot=::C::slot::c 1} -mixin:relation,arg=object-mixin,slot=::nx::Object::slot::mixin -filter:relation,arg=object-filter,slot=::nx::Object::slot::filter -noinit:method,optional,noarg -volatile:method,optional,noarg __initcmd:initcmd,optional" \
+      "-b2:slot=::M2::slot::b2 -b:slot=::M::slot::b -m1:slot=::M::slot::m1 -m2:slot=::M::slot::m2 -d:required,slot=::D::slot::d -a:slot=::C::slot::a {-c:slot=::C::slot::c 1} -mixin:relation,arg=object-mixin,slot=::nx::Object::slot::mixin -filter:relation,arg=object-filter,slot=::nx::Object::slot::filter -noinit:method,noarg -volatile:method,noarg __initcmd:initcmd,optional" \
     "transitive mixin added"
   D mixin ""
   #we should have again the old interface
 
   ? {d1 eval :objectparameter} \
-      "-d:required,slot=::D::slot::d -a:slot=::C::slot::a -b:boolean,slot=::C::slot::b {-c:slot=::C::slot::c 1} -mixin:relation,arg=object-mixin,slot=::nx::Object::slot::mixin -filter:relation,arg=object-filter,slot=::nx::Object::slot::filter -noinit:method,optional,noarg -volatile:method,optional,noarg __initcmd:initcmd,optional"
+      "-d:required,slot=::D::slot::d -a:slot=::C::slot::a -b:boolean,slot=::C::slot::b {-c:slot=::C::slot::c 1} -mixin:relation,arg=object-mixin,slot=::nx::Object::slot::mixin -filter:relation,arg=object-filter,slot=::nx::Object::slot::filter -noinit:method,noarg -volatile:method,noarg __initcmd:initcmd,optional"
 
   C mixin M
   ? {d1 eval :objectparameter} \
-      "-b2:slot=::M2::slot::b2 -b:slot=::M::slot::b -m1:slot=::M::slot::m1 -m2:slot=::M::slot::m2 -d:required,slot=::D::slot::d -a:slot=::C::slot::a {-c:slot=::C::slot::c 1} -mixin:relation,arg=object-mixin,slot=::nx::Object::slot::mixin -filter:relation,arg=object-filter,slot=::nx::Object::slot::filter -noinit:method,optional,noarg -volatile:method,optional,noarg __initcmd:initcmd,optional" \
+      "-b2:slot=::M2::slot::b2 -b:slot=::M::slot::b -m1:slot=::M::slot::m1 -m2:slot=::M::slot::m2 -d:required,slot=::D::slot::d -a:slot=::C::slot::a {-c:slot=::C::slot::c 1} -mixin:relation,arg=object-mixin,slot=::nx::Object::slot::mixin -filter:relation,arg=object-filter,slot=::nx::Object::slot::filter -noinit:method,noarg -volatile:method,noarg __initcmd:initcmd,optional" \
     "mixin added"
   C mixin ""
   #we should have again the old interface
   
   ? {d1 eval :objectparameter} \
-      "-d:required,slot=::D::slot::d -a:slot=::C::slot::a -b:boolean,slot=::C::slot::b {-c:slot=::C::slot::c 1} -mixin:relation,arg=object-mixin,slot=::nx::Object::slot::mixin -filter:relation,arg=object-filter,slot=::nx::Object::slot::filter -noinit:method,optional,noarg -volatile:method,optional,noarg __initcmd:initcmd,optional" 
+      "-d:required,slot=::D::slot::d -a:slot=::C::slot::a -b:boolean,slot=::C::slot::b {-c:slot=::C::slot::c 1} -mixin:relation,arg=object-mixin,slot=::nx::Object::slot::mixin -filter:relation,arg=object-filter,slot=::nx::Object::slot::filter -noinit:method,noarg -volatile:method,noarg __initcmd:initcmd,optional" 
 }
 
 #######################################################