--- tclpkg/gv/gv.i
+++ tclpkg/gv/gv.i
@@ -24,6 +24,134 @@
 #undef PACKAGE_NAME
 
 #include "gvc.h"
+
+/* new graph objects */
+extern Agraph_t *graph(char *name);		/* new empty graph */
+extern Agraph_t *digraph(char *name);		/* new empty digraph */
+extern Agraph_t *strictgraph(char *name);	/* new empty strict graph */
+extern Agraph_t *strictdigraph(char *name);	/* new empty strict digraph */
+
+extern Agraph_t *readstring(char *string);	/* from dot-formatted string */
+extern Agraph_t *read(char *filename);		/* from dot-formatted file */
+extern Agraph_t *read(FILE *f);			/* from dot-formatted file */
+
+extern Agraph_t *graph(Agraph_t *g, char *name);/* add subgraph to graph */
+extern Agnode_t *node(Agraph_t *g, char *name);	/* add node to graph */
+extern Agedge_t *edge(Agnode_t *t, Agnode_t *h);/* add edge between existing nodes */
+				
+extern Agedge_t *edge(Agnode_t *t, char *hname);/* add edge, existing tail, named head which will be induced if necessary */
+extern Agedge_t *edge(char *tname, Agnode_t *h);/* add edge, named tail which will be induced if necessary, existing head */
+
+extern Agedge_t *edge(Agraph_t *g, char *tname, char *hname);/* add edge between named nodes, induced as necessary */
+
+/* set/get attribute of graph/node/edge */
+extern char *setv(Agraph_t *g, char *attr, char *val);
+extern char *setv(Agraph_t *g, char *gne, char *att, char *val);
+extern char *setv(Agnode_t *n, char *attr, char *val);
+extern char *setv(Agedge_t *e, char *attr, char *val);
+
+extern char *setv(Agraph_t *g, Agsym_t *a, char *val);
+extern char *setv(Agraph_t *g, char *gne, Agsym_t *a, char *val);
+extern char *setv(Agnode_t *n, Agsym_t *a, char *val);
+extern char *setv(Agedge_t *e, Agsym_t *a, char *val);
+
+extern char *getv(Agraph_t *g, char *attr);
+extern char *getv(Agraph_t *g, char *gne, char *attr);
+extern char *getv(Agnode_t *n, char *attr);
+extern char *getv(Agedge_t *e, char *attr);
+
+extern char *getv(Agraph_t *g, Agsym_t *a);
+extern char *getv(Agraph_t *g, char *gne, Agsym_t *a);
+extern char *getv(Agnode_t *n, Agsym_t *a);
+extern char *getv(Agedge_t *e, Agsym_t *a);
+
+/* names */
+extern char *nameof(Agraph_t *g);
+extern char *nameof(Agnode_t *n);
+//extern char *nameof(Agedge_t *e);
+extern char *nameof(Agsym_t *a);
+
+extern Agraph_t *findsubg(Agraph_t *g, char *name);
+extern Agnode_t *findnode(Agraph_t *g, char *name);
+extern Agedge_t *findedge(Agnode_t *t, Agnode_t *h);
+
+extern Agsym_t *findattr(Agraph_t *g, char *name);
+extern Agsym_t *findattr(Agnode_t *n, char *name);
+extern Agsym_t *findattr(Agedge_t *e, char *name);
+
+/* misc navigators */
+extern Agnode_t *headof(Agedge_t *e);
+extern Agnode_t *tailof(Agedge_t *e);
+extern Agraph_t *graphof(Agraph_t *g);
+extern Agraph_t *graphof(Agedge_t *e);
+extern Agraph_t *graphof(Agnode_t *n);
+extern Agraph_t *rootof(Agraph_t *g);
+
+/* iterators */
+extern bool ok(Agraph_t *g);
+extern bool ok(Agnode_t *n);
+extern bool ok(Agedge_t *e);
+extern bool ok(Agsym_t *a);
+
+extern Agraph_t *firstsubg(Agraph_t *g);
+extern Agraph_t *nextsubg(Agraph_t *g, Agraph_t *sg);
+
+extern Agraph_t *firstsupg(Agraph_t *g);
+extern Agraph_t *nextsupg(Agraph_t *g, Agraph_t *sg);
+
+extern Agedge_t *firstedge(Agraph_t *g);
+extern Agedge_t *nextedge(Agraph_t *g, Agedge_t *e);
+
+extern Agedge_t *firstout(Agraph_t *g);
+extern Agedge_t *nextout(Agraph_t *g, Agedge_t *e);
+
+extern Agedge_t *firstedge(Agnode_t *n);
+extern Agedge_t *nextedge(Agnode_t *n, Agedge_t *e);
+
+extern Agedge_t *firstout(Agnode_t *n);
+extern Agedge_t *nextout(Agnode_t *n, Agedge_t *e);
+
+extern Agnode_t *firsthead(Agnode_t *n);
+extern Agnode_t *nexthead(Agnode_t *n, Agnode_t *h);
+
+extern Agedge_t *firstin(Agraph_t *g);
+extern Agedge_t *nextin(Agnode_t *n, Agedge_t *e);
+
+extern Agedge_t *firstin(Agnode_t *n);
+extern Agedge_t *nextin(Agraph_t *g, Agedge_t *e);
+
+extern Agnode_t *firsttail(Agnode_t *n);
+extern Agnode_t *nexttail(Agnode_t *n, Agnode_t *t);
+
+extern Agnode_t *firstnode(Agraph_t *g);
+extern Agnode_t *nextnode(Agraph_t *g, Agnode_t *n);
+
+extern Agnode_t *firstnode(Agedge_t *e);
+extern Agnode_t *nextnode(Agedge_t *e, Agnode_t *n);
+
+extern Agsym_t *firstattr(Agraph_t *g);
+extern Agsym_t *firstattr(Agraph_t *g, char *gne);
+extern Agsym_t *nextattr(Agraph_t *g, Agsym_t *a);
+extern Agsym_t *nextattr(Agraph_t *g, char *gne, Agsym_t *a);
+
+extern Agsym_t *firstattr(Agnode_t *n);
+extern Agsym_t *nextattr(Agnode_t *n, Agsym_t *a);
+
+extern Agsym_t *firstattr(Agedge_t *e);
+extern Agsym_t *nextattr(Agedge_t *e, Agsym_t *a);
+
+/* remove graph objects */
+extern void rm(Agraph_t *g);
+extern void rm(Agnode_t *n);
+extern void rm(Agedge_t *e);
+
+extern void layout(Agraph_t *g, char *engine);
+
+extern void render(Agraph_t *g, char *format);
+extern void render(Agraph_t *g, char *format, char *filename);
+extern void render(Agraph_t *g, char *format, FILE *f);
+extern void render(Agraph_t *g, char *format, void **data);
+
 %}
 
 %inline %{