Index: trunk/src/libcschem/Makefile.in
===================================================================
--- trunk/src/libcschem/Makefile.in	(revision 669)
+++ trunk/src/libcschem/Makefile.in	(revision 670)
@@ -27,6 +27,7 @@
  rtree.o
  vtcoutline.o
  vtoid.o
+ vtoidpath.o
 @]
 #temporary hack until pup is set up
 append /local/csch/OBJS [@
Index: trunk/src/libcschem/cnc_conn.h
===================================================================
--- trunk/src/libcschem/cnc_conn.h	(revision 669)
+++ trunk/src/libcschem/cnc_conn.h	(revision 670)
@@ -28,14 +28,17 @@
 #ifndef CSCH_CONCRETE_CONN_H
 #define CSCH_CONCRETE_CONN_H
 #include "libcschem/concrete.h"
-#include "libcschem/vtoid.h"
+#include "libcschem/vtoidpath.h"
 
 /* type=CSCH_CTYPE_CONN */
 
 typedef struct csch_conn_s {
 	csch_chdr_t hdr;
-	csch_vtoid_t conn;
+	vtp0_t conn;                /* if not empty, ->conn_path is empty */
 	csch_oid_t gfx;
+
+	/* cache: file I/O version */
+	csch_vtoidpath_t conn_path; /* if not empty, ->conn is empty */
 } csch_conn_t;
 
 csch_conn_t *csch_conn_alloc(csch_sheet_t *sheet, csch_cgrp_t *parent, csch_oid_t oid);
Index: trunk/src/libcschem/vtoid.h
===================================================================
--- trunk/src/libcschem/vtoid.h	(revision 669)
+++ trunk/src/libcschem/vtoid.h	(revision 670)
@@ -1,5 +1,5 @@
-#ifndef VTCSCH_OID_H
-#define VTCSCH_OID_H
+#ifndef CSCH_VTOID_H
+#define CSCH_VTOID_H
 
 #include <stdlib.h>
 #include <string.h>
Index: trunk/src/libcschem/vtoidpath.c
===================================================================
--- trunk/src/libcschem/vtoidpath.c	(nonexistent)
+++ trunk/src/libcschem/vtoidpath.c	(revision 670)
@@ -0,0 +1,5 @@
+#include <genvector/gds_char.h>
+#include "vtoid.h"
+#define GVT_DONT_UNDEF
+#include "vtoidpath.h"
+#include <genvector/genvector_impl.c>
Index: trunk/src/libcschem/vtoidpath.h
===================================================================
--- trunk/src/libcschem/vtoidpath.h	(nonexistent)
+++ trunk/src/libcschem/vtoidpath.h	(revision 670)
@@ -0,0 +1,21 @@
+#ifndef CSCH_VTOIDPATH_H
+#define CSCH_VTOIDPATH_H
+
+#include <stdlib.h>
+#include <string.h>
+#include "libcschem/common_types.h"
+#include "libcschem/oidpath.h"
+
+#define GVT(x) csch_vtoidpath_ ## x
+
+#define GVT_ELEM_TYPE csch_oidpath_t
+#define GVT_SIZE_TYPE long
+#define GVT_DOUBLING_THRS 1024
+#define GVT_START_SIZE 4
+#define GVT_FUNC
+#define GVT_SET_NEW_BYTES_TO 0
+#include <genvector/genvector_impl.h>
+#define GVT_REALLOC(vect, ptr, size)  realloc(ptr, size)
+#define GVT_FREE(vect, ptr)           free(ptr)
+#include <genvector/genvector_undef.h>
+#endif