Index: trunk/src/libcschem/cnc_grp.c
===================================================================
--- trunk/src/libcschem/cnc_grp.c	(revision 10859)
+++ trunk/src/libcschem/cnc_grp.c	(revision 10860)
@@ -2,7 +2,7 @@
  *                            COPYRIGHT
  *
  *  cschem - modular/flexible schematics editor - libcschem (core library)
- *  Copyright (C) 2018..2020,2022,2023 Tibor 'Igor2' Palinkas
+ *  Copyright (C) 2018..2020,2022..2024 Tibor 'Igor2' Palinkas
  *
  *  (Supported by NLnet NGI0 PET Fund in 2022, Entrust in 2023)
  *
@@ -57,6 +57,7 @@
 #include "project.h"
 #include "abstract.h"
 #include "libcschem.h"
+#include "extobj.h"
 
 RND_INLINE csch_role_t csch_role_str2role(const char *str)
 {
@@ -327,6 +328,8 @@
 		csch_role_set(grp, val);
 		csch_cgrp_update_dsply_recurse(sheet, grp); /* need to move all opjects to the wire layer */
 	}
+	if (strcmp(key, "extobj") == 0)
+		grp->extobj = csch_extobj_lookup(val);
 }
 
 csch_ahdr_t *csch_cgrp_get_abstract(csch_sheet_t *sheet, const csch_cgrp_t *grp, long idx)
Index: trunk/src/libcschem/concrete.h
===================================================================
--- trunk/src/libcschem/concrete.h	(revision 10859)
+++ trunk/src/libcschem/concrete.h	(revision 10860)
@@ -152,6 +152,8 @@
 	void *mark_ptr;
 };
 
+typedef struct csch_extobj_impl_s csch_extobj_impl_t;
+
 struct csch_cgrp_s { /* type=CSCH_CTYPE_GRP || CSCH_CTYPE_GRP_REF */
 	csch_chdr_t hdr;
 	minuid_bin_t uuid;      /* instance (changes on dup/copy) */
@@ -191,6 +193,7 @@
 	vtl0_t aid;        /* link to the abstract objects compiled from this group; zero or one in flat design but can be more in hierarchic */
 	char *file_name;   /* hint: trace file name from which the group was loaded, if available */
 	csch_rtree_box_t bbox_flt; /* bounding box with floaters included (e.g. for sheet size) */
+	const csch_extobj_impl_t *extobj; /* handler; not NULL if extobj attrib is set, but if implementation no found, all fields are NULL */
 };
 
 typedef enum csch_sheet_type_e {
Index: trunk/src/libcschem/extobj.h
===================================================================
--- trunk/src/libcschem/extobj.h	(revision 10859)
+++ trunk/src/libcschem/extobj.h	(revision 10860)
@@ -26,7 +26,7 @@
 
 #include <libcschem/concrete.h>
 
-typedef struct csch_extobj_impl_s {
+struct csch_extobj_impl_s {
 	const char *name;   /* also the hash key */
 
 	void (*attr_edit_pre)(csch_cgrp_t *grp, const char *key);
@@ -33,7 +33,7 @@
 	void (*attr_edit_post)(csch_cgrp_t *grp, const char *key);
 	void (*update)(csch_cgrp_t *grp);
 	void (*gui_edit)(csch_cgrp_t *grp);
-} csch_extobj_impl_t;
+};
 
 void csch_extobj_impl_reg(const csch_extobj_impl_t *impl);
 void csch_extobj_impl_unreg(const csch_extobj_impl_t *impl);
@@ -43,3 +43,5 @@
 /* internal, do not call */
 void csch_extobj_init(void);
 void csch_extobj_uninit(void);
+const csch_extobj_impl_t *csch_extobj_lookup(const char *name);
+