diff --git a/skeletons/BOOLEAN.c b/skeletons/BOOLEAN.c
index d0907fb..1b74ea1 100644
--- a/skeletons/BOOLEAN.c
+++ b/skeletons/BOOLEAN.c
@@ -161,10 +161,7 @@
 		}
 		return XPBD_BODY_CONSUMED;
 	} else {
-		if(xer_is_whitespace(chunk_buf, chunk_size))
-			return XPBD_NOT_BODY_IGNORE;
-		else
-			return XPBD_BROKEN_ENCODING;
+		return XPBD_BROKEN_ENCODING;
 	}
 }
 
diff --git a/skeletons/NULL.c b/skeletons/NULL.c
index 6d3316f..b5c4b7e 100644
--- a/skeletons/NULL.c
+++ b/skeletons/NULL.c
@@ -74,10 +74,13 @@
 	(void)td;
 	(void)sptr;
 
-	if(xer_is_whitespace(chunk_buf, chunk_size))
-		return XPBD_BODY_CONSUMED;
-	else
+	/*
+	 * There must be no content in self-terminating <NULL/> tag.
+	 */
+	if(chunk_size)
 		return XPBD_BROKEN_ENCODING;
+	else
+		return XPBD_BODY_CONSUMED;
 }
 
 asn_dec_rval_t
diff --git a/skeletons/asn_codecs_prim.c b/skeletons/asn_codecs_prim.c
index a609f81..8c7a4e0 100644
--- a/skeletons/asn_codecs_prim.c
+++ b/skeletons/asn_codecs_prim.c
@@ -186,9 +186,10 @@
 xer_decode__primitive_body(void *key, const void *chunk_buf, size_t chunk_size, int have_more) {
 	struct xdp_arg_s *arg = (struct xdp_arg_s *)key;
 	enum xer_pbd_rval bret;
+	size_t lead_wsp_size;
 
 	if(arg->decoded_something) {
-		if(xer_is_whitespace(chunk_buf, chunk_size)) {
+		if(xer_whitespace_span(chunk_buf, chunk_size) == chunk_size) {
 			/*
 			 * Example:
 			 * "<INTEGER>123<!--/--> </INTEGER>"
@@ -215,6 +216,10 @@
 		return -1;
 	}
 
+	lead_wsp_size = xer_whitespace_span(chunk_buf, chunk_size);
+	chunk_buf += lead_wsp_size;
+	chunk_size -= lead_wsp_size;
+
 	bret = arg->prim_body_decoder(arg->type_descriptor,
 		arg->struct_key, chunk_buf, chunk_size);
 	switch(bret) {
@@ -227,7 +232,7 @@
 		arg->decoded_something = 1;
 		/* Fall through */
 	case XPBD_NOT_BODY_IGNORE:	/* Safe to proceed further */
-		return chunk_size;
+		return lead_wsp_size + chunk_size;
 	}
 
 	return -1;
diff --git a/skeletons/xer_decoder.c b/skeletons/xer_decoder.c
index 03cb397..cb4b5f8 100644
--- a/skeletons/xer_decoder.c
+++ b/skeletons/xer_decoder.c
@@ -316,8 +316,8 @@
 }
 
 
-int
-xer_is_whitespace(const void *chunk_buf, size_t chunk_size) {
+size_t
+xer_whitespace_span(const void *chunk_buf, size_t chunk_size) {
 	const char *p = (const char *)chunk_buf;
 	const char *pend = p + chunk_size;
 
@@ -330,12 +330,13 @@
 		 * SPACE (32)
 		 */
 		case 0x09: case 0x0a: case 0x0d: case 0x20:
-			break;
+			continue;
 		default:
-			return 0;
+			break;
 		}
+		break;
 	}
-	return 1;       /* All whitespace */
+	return (p - (const char *)chunk_buf);
 }
 
 /*
diff --git a/skeletons/xer_decoder.h b/skeletons/xer_decoder.h
index cf0d846..6988648 100644
--- a/skeletons/xer_decoder.h
+++ b/skeletons/xer_decoder.h
@@ -87,12 +87,11 @@
 		const char *need_tag);
 
 /*
- * Check whether this buffer consists of entirely XER whitespace characters.
+ * Get the number of bytes consisting entirely of XER whitespace characters.
  * RETURN VALUES:
- * 1:	Whitespace or empty string
- * 0:	Non-whitespace
+ * >=0:	Number of whitespace characters in the string.
  */
-int xer_is_whitespace(const void *chunk_buf, size_t chunk_size);
+size_t xer_whitespace_span(const void *chunk_buf, size_t chunk_size);
 
 /*
  * Skip the series of anticipated extensions.