diff --git a/C/c_interface.c b/C/c_interface.c
index 69dc79708..351267e19 100755
--- a/C/c_interface.c
+++ b/C/c_interface.c
@@ -477,6 +477,8 @@ X_API Term    STD_PROTO(YAP_GetFromSlot,(Int));
 X_API Term   *STD_PROTO(YAP_AddressFromSlot,(Int));
 X_API void    STD_PROTO(YAP_PutInSlot,(Int, Term));
 X_API int     STD_PROTO(YAP_RecoverSlots,(int));
+X_API Int     STD_PROTO(YAP_ArgsToSlots,(int));
+X_API void    STD_PROTO(YAP_SlotsToArgs,(int, Int));
 X_API void    STD_PROTO(YAP_Throw,(Term));
 X_API void    STD_PROTO(YAP_Halt,(int));
 X_API Term   *STD_PROTO(YAP_TopOfLocalStack,(void));
@@ -3077,4 +3079,25 @@ YAP_Erase(void *handle)
   return 1;
 }
 
+X_API Int
+YAP_ArgsToSlots(int n)
+{
+  Int slot = Yap_NewSlots(n);
+  CELL *ptr0 = LCL0+slot, *ptr1=&ARG1;
+  while (n--) {
+    *ptr0++ = *ptr1++;
+  }
+  return slot;
+}
+
+X_API void
+YAP_SlotsToArgs(int n, Int slot)
+{
+  CELL *ptr0 = LCL0+slot, *ptr1=&ARG1;
+  while (n--) {
+    *ptr1++ = *ptr0++;
+  }
+}
+
+
 
diff --git a/docs/yap.tex b/docs/yap.tex
index e60fa3747..d40481b68 100644
--- a/docs/yap.tex
+++ b/docs/yap.tex
@@ -15674,12 +15674,12 @@ YAP that the slot @var{sl} is not needed and can be given back to the
 system. The slot functions are as follows:
 
 @table @code
-@item long int YAP_NewSlots(int @var{NumberOfSlots})
+@item YAP_Int YAP_NewSlots(int @var{NumberOfSlots})
 @findex YAP_NewSlots (C-Interface function)
 Allocate @var{NumberOfSlots} from the stack and return an handle to the
 last one. The other handle can be obtained by decrementing the handle.
 
-@item long int YAP_CurrentSlot(void)
+@item YAP_Int YAP_CurrentSlot(void)
 @findex YAP_CurrentSlot (C-Interface function)
 Return a handle to the system's default slot.
 
@@ -15688,11 +15688,11 @@ Return a handle to the system's default slot.
 Create a new slot, initialise it with @var{t}, and return a handle to
 this slot, that also becomes the current slot.
 
-@item YAP_Term *YAP_AddressFromSlot(long int @var{slot})
+@item YAP_Term *YAP_AddressFromSlot(YAP_Int @var{slot})
 @findex YAP_AddressFromSlot (C-Interface function)
 Return the address of slot @var{slot}: please use with care.
 
-@item void YAP_PutInSlot(long int @var{slot}, YAP_Term @var{t})
+@item void YAP_PutInSlot(YAP_Int @var{slot}, YAP_Term @var{t})
 @findex YAP_PutInSlot (C-Interface function)
 Set the contents of slot @var{slot} to @var{t}.
 
@@ -15700,6 +15700,15 @@ Set the contents of slot @var{slot} to @var{t}.
 @findex YAP_RecoverSlots (C-Interface function)
 Recover the space for @var{HowMany} slots: these will include the
 current default slot. Fails if no such slots exist.
+
+@item YAP_Int YAP_ArgsToSlots(int @var{HowMany})
+@findex YAP_ArgsToSlots (C-Interface function)
+Store the current first  @var{HowMany} arguments in new slots.
+
+@item void YAP_SlotsToArgs(int @var{HowMany}, YAP_Int @var{slot})
+@findex YAP_SlotsToArgs (C-Interface function)
+Set the first @var{HowMany} arguments to the @var{HowMany} slots
+starting at @var{slot}.
 @end table
 
 The following functions complement @var{YAP_RunGoal}:
diff --git a/include/YapInterface.h b/include/YapInterface.h
index 02df70f08..163b179c6 100755
--- a/include/YapInterface.h
+++ b/include/YapInterface.h
@@ -426,6 +426,12 @@ extern X_API void PROTO(YAP_PutInSlot,(YAP_Int, YAP_Term));
 /*  void  YAP_RecoverSlots()  */
 extern X_API int PROTO(YAP_RecoverSlots,(int));
 
+/*  void  YAP_RecoverSlots()  */
+extern X_API YAP_Int PROTO(YAP_ArgsToSlots,(int));
+
+/*  void  YAP_RecoverSlots()  */
+extern X_API void PROTO(YAP_SlotsToArgs,(int, YAP_Int));
+
 /*  void  YAP_Throw()  */
 extern X_API void PROTO(YAP_Throw,(YAP_Term));
 
diff --git a/packages/RDF/test_write.pl b/packages/RDF/test_write.pl
index ec9e3fd81..8be94c5e5 100644
--- a/packages/RDF/test_write.pl
+++ b/packages/RDF/test_write.pl
@@ -35,14 +35,6 @@
             run_tests/1
 	  ]).
 
-:- asserta(user:file_search_path(foreign, '../sgml')).
-:- asserta(user:file_search_path(foreign, '../semweb')).
-:- asserta(user:file_search_path(foreign, '../clib')).
-:- asserta(user:file_search_path(library, '..')).
-:- asserta(user:file_search_path(library, '../sgml')).
-:- asserta(user:file_search_path(library, '.')).
-:- asserta(user:file_search_path(library, '../plunit')).
-:- asserta(user:file_search_path(library, '../clib')).
 
 :- use_module(library(plunit)).
 :- use_module(library(rdf_write)).
@@ -50,7 +42,7 @@
 :- use_module(library(lists)).
 :- use_module(library(debug)).
 :- use_module(library(semweb/rdf_db)).
-:- use_module(rdf).
+:- use_module(library(rdf)).
 
 :- expects_dialect(swi).
 :- assert(system:swi_io).
diff --git a/packages/RDF/w3c_test.pl b/packages/RDF/w3c_test.pl
index 3133ce675..9a1c3a40a 100644
--- a/packages/RDF/w3c_test.pl
+++ b/packages/RDF/w3c_test.pl
@@ -22,8 +22,8 @@
 					% get libraries locally
 :- asserta(user:file_search_path(library, '.')).
 
-:- use_module(rdf).			% our RDF parser
-:- use_module(rdf_ntriples).			% read .nt files
+:- use_module(library(rdf)).			% our RDF parser
+:- use_module(library(rdf_ntriples)).			% read .nt files
 :- load_files([ library(pce),
 		library(toolbar),
 		library(pce_report),