diff --git a/skeletons/constr_SEQUENCE.c b/skeletons/constr_SEQUENCE.c
index 5e1a053..0cfcdad 100644
--- a/skeletons/constr_SEQUENCE.c
+++ b/skeletons/constr_SEQUENCE.c
@@ -5,6 +5,7 @@
  */
 #include <asn_internal.h>
 #include <constr_SEQUENCE.h>
+#include <per_opentype.h>
 
 /*
  * Number of bytes left for this structure.
@@ -1026,235 +1027,6 @@
 	return 0;
 }
 
-/*
- * #10.1, #10.2
- */
-static int
-uper_put_open_type(asn_TYPE_descriptor_t *td, asn_per_constraints_t *constraints, void *sptr, asn_per_outp_t *po) {
-	void *buf;
-	ssize_t size;
-
-	ASN_DEBUG("Encoding as open type %s", td->name);
-	size = uper_encode_to_new_buffer(td, constraints, sptr, &buf);
-	if(size <= 0) return -1;
-
-	ASN_DEBUG("Putting %s of length %d", td->name, size);
-	while(size) {
-		ssize_t maySave = uper_put_length(po, size);
-		if(maySave < 0) break;
-		if(per_put_many_bits(po, buf, maySave * 8)) break;
-		buf = (char *)buf + maySave;
-		size -= maySave;
-	}
-
-	if(size) {
-		FREEMEM(buf);
-		return -1;
-	}
-
-	return 0;
-}
-
-typedef struct uper_ugot_key {
-	asn_per_data_t oldpd;	/* Old per data source */
-	size_t unclaimed;
-	size_t ot_moved;	/* Number of bits moved by OT processing */
-	int repeat;
-} uper_ugot_key;
-static int
-uper_ugot_refill(asn_per_data_t *pd) {
-	uper_ugot_key *arg = pd->refill_key;
-	ssize_t next_chunk_bytes, next_chunk_bits;
-	ssize_t avail;
-
-	asn_per_data_t *oldpd = &arg->oldpd;
-
-	ASN_DEBUG("REFILLING (%+db) [from %d (%d->%d)_%d] now [%d (%d->%d)_%d] uncl %d",
-		pd->buffer - oldpd->buffer,
-		oldpd->nbits - oldpd->nboff, oldpd->nboff, oldpd->nbits, oldpd->moved,
-		pd->nbits - pd->nboff, pd->nboff, pd->nbits, pd->moved, arg->unclaimed);
-
-	/* Advance our position to where pd is */
-	oldpd->buffer = pd->buffer;
-	oldpd->nboff  = pd->nboff;
-	oldpd->nbits -= pd->moved - arg->ot_moved;
-	oldpd->moved += pd->moved - arg->ot_moved;
-	arg->ot_moved = pd->moved;
-
-	if(arg->unclaimed) {
-		/* Refill the container */
-		if(per_get_few_bits(oldpd, 1))
-			return -1;
-		if(oldpd->nboff == 0) {
-			assert(0);
-			return -1;
-		}
-		pd->buffer = oldpd->buffer;
-		pd->nboff = oldpd->nboff - 1;
-		pd->nbits = oldpd->nbits;
-		ASN_DEBUG("Return from UNCLAIMED");
-		return 0;
-	}
-
-	if(!arg->repeat) {
-		ASN_DEBUG("Want more but refill doesn't have it");
-		return -1;
-	}
-
-	next_chunk_bytes = uper_get_length(oldpd, -1, &arg->repeat);
-	ASN_DEBUG("Open type LENGTH %d bytes at off %d, repeat %d",
-		next_chunk_bytes, oldpd->moved, arg->repeat);
-	if(next_chunk_bytes < 0) return -1;
-	if(next_chunk_bytes == 0) {
-		pd->refill = 0;	/* No more refills, naturally */
-		assert(!arg->repeat);	/* Implementation guarantee */
-	}
-	next_chunk_bits = next_chunk_bytes << 3;
-	avail = oldpd->nbits - oldpd->nboff;
-	if(avail >= next_chunk_bits) {
-		pd->nbits = oldpd->nboff + next_chunk_bits;
-		arg->unclaimed = 0;
-	} else {
-		pd->nbits = oldpd->nbits;
-		arg->unclaimed = next_chunk_bits - avail;
-		ASN_DEBUG("Parent has %d, require %d, will claim %d", avail, next_chunk_bits, arg->unclaimed);
-	}
-	pd->buffer = oldpd->buffer;
-	pd->nboff = oldpd->nboff;
-	return 0;
-}
-
-asn_dec_rval_t
-uper_get_open_type(asn_codec_ctx_t *opt_codec_ctx, asn_TYPE_descriptor_t *td,
-	asn_per_constraints_t *constraints, void **sptr, asn_per_data_t *pd) {
-	uper_ugot_key arg;
-	asn_dec_rval_t rv;
-	ssize_t padding;
-
-	_ASN_STACK_OVERFLOW_CHECK(opt_codec_ctx);
-
-	ASN_DEBUG("Getting open type off %d (%d+%d), %p", pd->moved, pd->nboff, pd->nbits, pd->buffer);
-	arg.oldpd = *pd;
-	arg.unclaimed = 0;
-	arg.ot_moved = 0;
-	arg.repeat = 1;
-	pd->refill = uper_ugot_refill;
-	pd->refill_key = &arg;
-	pd->nbits = pd->nboff;	/* 0 good bits at this point, will refill */
-	pd->moved = 0;	/* This now counts the open type size in bits */
-
-	rv = td->uper_decoder(opt_codec_ctx, td, constraints, sptr, pd);
-
-	ASN_DEBUG("Open type %s consumed %d off of %d unclaimed=%d, repeat=%d",
-		td->name, pd->moved, arg.oldpd.moved,
-		arg.unclaimed, arg.repeat);
-
-	ASN_DEBUG("OT1 moved %d, estimated %d uncl=%d",
-		arg.oldpd.moved,
-		arg.oldpd.nboff + ((((int)arg.oldpd.buffer) & 0x7) << 3),
-		arg.unclaimed
-	);
-
-	padding = pd->moved % 8;
-	if(padding) {
-		int32_t pvalue;
-		if(padding > 7) {
-			ASN_DEBUG("Too large padding %d in open type",
-				padding);
-			rv.code = RC_FAIL;
-			return rv;
-		}
-		padding = 8 - padding;
-		ASN_DEBUG("Getting padding of %d bits", padding);
-		pvalue = per_get_few_bits(pd, padding);
-		switch(pvalue) {
-		case -1:
-			ASN_DEBUG("Padding skip failed");
-			_ASN_DECODE_STARVED;
-		case 0: break;
-		default:
-			ASN_DEBUG("Non-blank padding (%d bits 0x%02x)",
-				padding, pvalue);
-			_ASN_DECODE_FAILED;
-		}
-	}
-	if(pd->nbits != pd->nboff) {
-		ASN_DEBUG("Open type container overhead of %d bits!", pd->nbits - pd->nboff);
-		if(1) _ASN_DECODE_FAILED;
-		arg.unclaimed += pd->nbits - pd->nboff;
-	}
-
-	/* Adjust pd back so it points to original data */
-	pd->nbits = arg.oldpd.nbits - (pd->moved - arg.ot_moved);
-	pd->moved = arg.oldpd.moved + (pd->moved - arg.ot_moved);
-	pd->refill = arg.oldpd.refill;
-	pd->refill_key = arg.oldpd.refill_key;
-
-	/* Skip data not consumed by the decoder */
-	if(arg.unclaimed) ASN_DEBUG("Getting unclaimed %d", arg.unclaimed);
-	while(arg.unclaimed) {
-		size_t toget = 24;
-		if(arg.unclaimed < toget)
-			toget = arg.unclaimed;
-		arg.unclaimed -= toget;
-		switch(per_get_few_bits(pd, toget)) {
-		case -1:
-			ASN_DEBUG("Claim of %d failed", toget);
-			_ASN_DECODE_STARVED;
-		case 0:
-			ASN_DEBUG("Got claim of %d", toget);
-			continue;
-		default:
-			/* Padding must be blank */
-			ASN_DEBUG("Non-blank unconsumed padding");
-			_ASN_DECODE_FAILED;
-		}
-	}
-
-	assert(pd->moved == pd->nboff + ((((int)pd->buffer) & 0x7) << 3));
-
-	if(arg.repeat) {
-		ASN_DEBUG("Not consumed the whole thing");
-		rv.code = RC_FAIL;
-		return rv;
-	}
-
-	return rv;
-}
-
-asn_dec_rval_t
-uper_sot_suck(asn_codec_ctx_t *opt_codec_ctx, asn_TYPE_descriptor_t *td,
-	asn_per_constraints_t *constraints, void **sptr, asn_per_data_t *pd) {
-	asn_dec_rval_t rv;
-
-	(void)opt_codec_ctx;
-	(void)td;
-	(void)constraints;
-	(void)sptr;
-
-	while(per_get_few_bits(pd, 24) >= 0);
-
-	rv.code = RC_OK;
-	rv.consumed = pd->moved;
-
-	return rv;
-}
-
-static int
-uper_skip_open_type(asn_codec_ctx_t *opt_codec_ctx, asn_per_data_t *pd) {
-	asn_TYPE_descriptor_t s_td;
-	asn_dec_rval_t rv;
-
-	s_td.name = "<unknown extension>";
-	s_td.uper_decoder = uper_sot_suck;
-
-	rv = uper_get_open_type(opt_codec_ctx, &s_td, 0, 0, pd);
-	if(rv.code != RC_OK)
-		return -1;
-	else
-		return 0;
-}
-
 asn_dec_rval_t
 SEQUENCE_decode_uper(asn_codec_ctx_t *opt_codec_ctx, asn_TYPE_descriptor_t *td,
 	asn_per_constraints_t *constraints, void **sptr, asn_per_data_t *pd) {
@@ -1413,7 +1185,7 @@
 		}
 
 		ASN_DEBUG("Decoding member %s in %s %p", elm->name, td->name, *memb_ptr2);
-		rv = uper_get_open_type(opt_codec_ctx, elm->type,
+		rv = uper_open_type_get(opt_codec_ctx, elm->type,
 			elm->per_constraints, memb_ptr2, pd);
 		if(rv.code != RC_OK) {
 			FREEMEM(epres);
@@ -1429,7 +1201,7 @@
 			case -1: break;
 			case 0: continue;
 			default:
-				if(uper_skip_open_type(opt_codec_ctx, pd)) {
+				if(uper_open_type_skip(opt_codec_ctx, pd)) {
 					FREEMEM(epres);
 					_ASN_DECODE_STARVED;
 				}
@@ -1511,7 +1283,7 @@
 		if(po1 && per_put_few_bits(po1, present, 1))
 			return -1;
 		/* Encode as open type field */
-		if(po2 && present && uper_put_open_type(elm->type,
+		if(po2 && present && uper_open_type_put(elm->type,
 				elm->per_constraints, *memb_ptr2, po2))
 			return -1;
 
diff --git a/skeletons/file-dependencies b/skeletons/file-dependencies
index 8fc6f03..c2a5dae 100644
--- a/skeletons/file-dependencies
+++ b/skeletons/file-dependencies
@@ -61,6 +61,7 @@
 per_support.h per_support.c	# PER parsing
 per_decoder.h per_decoder.c	# PER decoding support
 per_encoder.h per_encoder.c	# PER encoding support
+per_opentype.h per_opentype.c	# PER "open type" handling
 
 CONVERTER:			# THIS IS A SPECIAL SECTION
 converter-sample.c		# A default name for sample transcoder
diff --git a/skeletons/per_opentype.c b/skeletons/per_opentype.c
new file mode 100644
index 0000000..f2cac93
--- /dev/null
+++ b/skeletons/per_opentype.c
@@ -0,0 +1,245 @@
+/*
+ * Copyright (c) 2007 Lev Walkin <vlm@lionet.info>. All rights reserved.
+ * Redistribution and modifications are permitted subject to BSD license.
+ */
+#include <asn_internal.h>
+#include <per_support.h>
+#include <constr_TYPE.h>
+#include <per_opentype.h>
+
+typedef struct uper_ugot_key {
+	asn_per_data_t oldpd;	/* Old per data source */
+	size_t unclaimed;
+	size_t ot_moved;	/* Number of bits moved by OT processing */
+	int repeat;
+} uper_ugot_key;
+
+static int uper_ugot_refill(asn_per_data_t *pd);
+static asn_dec_rval_t uper_sot_suck(asn_codec_ctx_t *opt_codec_ctx, asn_TYPE_descriptor_t *td, asn_per_constraints_t *constraints, void **sptr, asn_per_data_t *pd);
+
+/*
+ * #10.1, #10.2
+ */
+int
+uper_open_type_put(asn_TYPE_descriptor_t *td, asn_per_constraints_t *constraints, void *sptr, asn_per_outp_t *po) {
+	void *buf;
+	ssize_t size;
+
+	ASN_DEBUG("Encoding as open type %s", td->name);
+	size = uper_encode_to_new_buffer(td, constraints, sptr, &buf);
+	if(size <= 0) return -1;
+
+	ASN_DEBUG("Putting %s of length %d", td->name, size);
+	while(size) {
+		ssize_t maySave = uper_put_length(po, size);
+		if(maySave < 0) break;
+		if(per_put_many_bits(po, buf, maySave * 8)) break;
+		buf = (char *)buf + maySave;
+		size -= maySave;
+	}
+
+	if(size) {
+		FREEMEM(buf);
+		return -1;
+	}
+
+	return 0;
+}
+
+asn_dec_rval_t
+uper_open_type_get(asn_codec_ctx_t *opt_codec_ctx, asn_TYPE_descriptor_t *td,
+	asn_per_constraints_t *constraints, void **sptr, asn_per_data_t *pd) {
+	uper_ugot_key arg;
+	asn_dec_rval_t rv;
+	ssize_t padding;
+
+	_ASN_STACK_OVERFLOW_CHECK(opt_codec_ctx);
+
+	ASN_DEBUG("Getting open type off %d (%d+%d), %p", pd->moved, pd->nboff, pd->nbits, pd->buffer);
+	arg.oldpd = *pd;
+	arg.unclaimed = 0;
+	arg.ot_moved = 0;
+	arg.repeat = 1;
+	pd->refill = uper_ugot_refill;
+	pd->refill_key = &arg;
+	pd->nbits = pd->nboff;	/* 0 good bits at this point, will refill */
+	pd->moved = 0;	/* This now counts the open type size in bits */
+
+	rv = td->uper_decoder(opt_codec_ctx, td, constraints, sptr, pd);
+
+	ASN_DEBUG("Open type %s consumed %d off of %d unclaimed=%d, repeat=%d",
+		td->name, pd->moved, arg.oldpd.moved,
+		arg.unclaimed, arg.repeat);
+
+	ASN_DEBUG("OT1 moved %d, estimated %d uncl=%d",
+		arg.oldpd.moved,
+		arg.oldpd.nboff + ((((int)arg.oldpd.buffer) & 0x7) << 3),
+		arg.unclaimed
+	);
+
+	padding = pd->moved % 8;
+	if(padding) {
+		int32_t pvalue;
+		if(padding > 7) {
+			ASN_DEBUG("Too large padding %d in open type",
+				padding);
+			rv.code = RC_FAIL;
+			return rv;
+		}
+		padding = 8 - padding;
+		ASN_DEBUG("Getting padding of %d bits", padding);
+		pvalue = per_get_few_bits(pd, padding);
+		switch(pvalue) {
+		case -1:
+			ASN_DEBUG("Padding skip failed");
+			_ASN_DECODE_STARVED;
+		case 0: break;
+		default:
+			ASN_DEBUG("Non-blank padding (%d bits 0x%02x)",
+				padding, pvalue);
+			_ASN_DECODE_FAILED;
+		}
+	}
+	if(pd->nbits != pd->nboff) {
+		ASN_DEBUG("Open type container overhead of %d bits!", pd->nbits - pd->nboff);
+		if(1) _ASN_DECODE_FAILED;
+		arg.unclaimed += pd->nbits - pd->nboff;
+	}
+
+	/* Adjust pd back so it points to original data */
+	pd->nbits = arg.oldpd.nbits - (pd->moved - arg.ot_moved);
+	pd->moved = arg.oldpd.moved + (pd->moved - arg.ot_moved);
+	pd->refill = arg.oldpd.refill;
+	pd->refill_key = arg.oldpd.refill_key;
+
+	/* Skip data not consumed by the decoder */
+	if(arg.unclaimed) ASN_DEBUG("Getting unclaimed %d", arg.unclaimed);
+	while(arg.unclaimed) {
+		size_t toget = 24;
+		if(arg.unclaimed < toget)
+			toget = arg.unclaimed;
+		arg.unclaimed -= toget;
+		switch(per_get_few_bits(pd, toget)) {
+		case -1:
+			ASN_DEBUG("Claim of %d failed", toget);
+			_ASN_DECODE_STARVED;
+		case 0:
+			ASN_DEBUG("Got claim of %d", toget);
+			continue;
+		default:
+			/* Padding must be blank */
+			ASN_DEBUG("Non-blank unconsumed padding");
+			_ASN_DECODE_FAILED;
+		}
+	}
+
+	assert(pd->moved == pd->nboff + ((((int)pd->buffer) & 0x7) << 3));
+
+	if(arg.repeat) {
+		ASN_DEBUG("Not consumed the whole thing");
+		rv.code = RC_FAIL;
+		return rv;
+	}
+
+	return rv;
+}
+
+int
+uper_open_type_skip(asn_codec_ctx_t *opt_codec_ctx, asn_per_data_t *pd) {
+	asn_TYPE_descriptor_t s_td;
+	asn_dec_rval_t rv;
+
+	s_td.name = "<unknown extension>";
+	s_td.uper_decoder = uper_sot_suck;
+
+	rv = uper_open_type_get(opt_codec_ctx, &s_td, 0, 0, pd);
+	if(rv.code != RC_OK)
+		return -1;
+	else
+		return 0;
+}
+
+/*
+ * Internal functions.
+ */
+
+static asn_dec_rval_t
+uper_sot_suck(asn_codec_ctx_t *opt_codec_ctx, asn_TYPE_descriptor_t *td,
+	asn_per_constraints_t *constraints, void **sptr, asn_per_data_t *pd) {
+	asn_dec_rval_t rv;
+
+	(void)opt_codec_ctx;
+	(void)td;
+	(void)constraints;
+	(void)sptr;
+
+	while(per_get_few_bits(pd, 24) >= 0);
+
+	rv.code = RC_OK;
+	rv.consumed = pd->moved;
+
+	return rv;
+}
+
+static int
+uper_ugot_refill(asn_per_data_t *pd) {
+	uper_ugot_key *arg = pd->refill_key;
+	ssize_t next_chunk_bytes, next_chunk_bits;
+	ssize_t avail;
+
+	asn_per_data_t *oldpd = &arg->oldpd;
+
+	ASN_DEBUG("REFILLING (%+db) [from %d (%d->%d)_%d] now [%d (%d->%d)_%d] uncl %d",
+		pd->buffer - oldpd->buffer,
+		oldpd->nbits - oldpd->nboff, oldpd->nboff, oldpd->nbits, oldpd->moved,
+		pd->nbits - pd->nboff, pd->nboff, pd->nbits, pd->moved, arg->unclaimed);
+
+	/* Advance our position to where pd is */
+	oldpd->buffer = pd->buffer;
+	oldpd->nboff  = pd->nboff;
+	oldpd->nbits -= pd->moved - arg->ot_moved;
+	oldpd->moved += pd->moved - arg->ot_moved;
+	arg->ot_moved = pd->moved;
+
+	if(arg->unclaimed) {
+		/* Refill the container */
+		if(per_get_few_bits(oldpd, 1))
+			return -1;
+		if(oldpd->nboff == 0) {
+			assert(0);
+			return -1;
+		}
+		pd->buffer = oldpd->buffer;
+		pd->nboff = oldpd->nboff - 1;
+		pd->nbits = oldpd->nbits;
+		ASN_DEBUG("Return from UNCLAIMED");
+		return 0;
+	}
+
+	if(!arg->repeat) {
+		ASN_DEBUG("Want more but refill doesn't have it");
+		return -1;
+	}
+
+	next_chunk_bytes = uper_get_length(oldpd, -1, &arg->repeat);
+	ASN_DEBUG("Open type LENGTH %d bytes at off %d, repeat %d",
+		next_chunk_bytes, oldpd->moved, arg->repeat);
+	if(next_chunk_bytes < 0) return -1;
+	if(next_chunk_bytes == 0) {
+		pd->refill = 0;	/* No more refills, naturally */
+		assert(!arg->repeat);	/* Implementation guarantee */
+	}
+	next_chunk_bits = next_chunk_bytes << 3;
+	avail = oldpd->nbits - oldpd->nboff;
+	if(avail >= next_chunk_bits) {
+		pd->nbits = oldpd->nboff + next_chunk_bits;
+		arg->unclaimed = 0;
+	} else {
+		pd->nbits = oldpd->nbits;
+		arg->unclaimed = next_chunk_bits - avail;
+		ASN_DEBUG("Parent has %d, require %d, will claim %d", avail, next_chunk_bits, arg->unclaimed);
+	}
+	pd->buffer = oldpd->buffer;
+	pd->nboff = oldpd->nboff;
+	return 0;
+}
diff --git a/skeletons/per_opentype.h b/skeletons/per_opentype.h
new file mode 100644
index 0000000..facfaa6
--- /dev/null
+++ b/skeletons/per_opentype.h
@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 2007 Lev Walkin <vlm@lionet.info>. All rights reserved.
+ * Redistribution and modifications are permitted subject to BSD license.
+ */
+#ifndef	_PER_OPENTYPE_H_
+#define	_PER_OPENTYPE_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+asn_dec_rval_t uper_open_type_get(asn_codec_ctx_t *opt_codec_ctx, asn_TYPE_descriptor_t *td, asn_per_constraints_t *constraints, void **sptr, asn_per_data_t *pd);
+
+int uper_open_type_skip(asn_codec_ctx_t *opt_codec_ctx, asn_per_data_t *pd);
+
+int uper_open_type_put(asn_TYPE_descriptor_t *td, asn_per_constraints_t *constraints, void *sptr, asn_per_outp_t *po);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif	/* _PER_OPENTYPE_H_ */
diff --git a/skeletons/per_support.c b/skeletons/per_support.c
index bfd733a..9406d96 100644
--- a/skeletons/per_support.c
+++ b/skeletons/per_support.c
@@ -1,5 +1,6 @@
 /*
- * Copyright (c) 2005, 2006 Lev Walkin <vlm@lionet.info>. All rights reserved.
+ * Copyright (c) 2005, 2006, 2007 Lev Walkin <vlm@lionet.info>.
+ * All rights reserved.
  * Redistribution and modifications are permitted subject to BSD license.
  */
 #include <asn_system.h>
diff --git a/skeletons/per_support.h b/skeletons/per_support.h
index bf06f05..653c351 100644
--- a/skeletons/per_support.h
+++ b/skeletons/per_support.h
@@ -1,5 +1,6 @@
 /*
- * Copyright (c) 2005, 2006 Lev Walkin <vlm@lionet.info>. All rights reserved.
+ * Copyright (c) 2005, 2006, 2007 Lev Walkin <vlm@lionet.info>.
+ * All rights reserved.
  * Redistribution and modifications are permitted subject to BSD license.
  */
 #ifndef	_PER_SUPPORT_H_