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diff --git a/asn/prt-ext.h b/asn/prt-ext.h
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+/*
+ * Copyright (c) 1995-1999, Index Data.
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and
+ * its documentation, in whole or in part, for any purpose, is hereby granted,
+ * provided that:
+ *
+ * 1. This copyright and permission notice appear in all copies of the
+ * software and its documentation. Notices of copyright or attribution
+ * which appear at the beginning of any file must remain unchanged.
+ *
+ * 2. The names of Index Data or the individual authors may not be used to
+ * endorse or promote products derived from this software without specific
+ * prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS, IMPLIED, OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
+ * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
+ * IN NO EVENT SHALL INDEX DATA BE LIABLE FOR ANY SPECIAL, INCIDENTAL,
+ * INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND, OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER OR
+ * NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
+ * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+ * OF THIS SOFTWARE.
+ *
+ */
+
+/*
+ * Biased-choice External for Z39.50.
+ */
+
+#ifndef PRT_EXT_H
+#define PRT_EXT_H
+
+#include <yaz/yconfig.h>
+#include <yaz/oid.h>
+
+
+YAZ_BEGIN_CDECL
+
+/*
+ * Used to keep track of known External definitions (a loose approach
+ * to DEFINED_BY).
+ */
+
+typedef struct Z_ext_typeent
+{
+    oid_value dref;    /* the direct-reference OID value. */
+    int what;          /* discriminator value for the external CHOICE */
+    Odr_fun fun;       /* decoder function */
+} Z_ext_typeent;
+
+struct Z_External
+{
+    Odr_oid *direct_reference;
+    int *indirect_reference;
+    char *descriptor;
+    int which;
+/* Generic types */
+#define Z_External_single 0
+#define Z_External_octet 1
+#define Z_External_arbitrary 2
+/* Specific types */
+#define Z_External_sutrs 3
+#define Z_External_explainRecord 4
+#define Z_External_resourceReport1 5
+#define Z_External_resourceReport2 6
+#define Z_External_promptObject1 7
+#define Z_External_grs1 8
+#define Z_External_extendedService 9
+#define Z_External_itemOrder 10
+#define Z_External_diag1 11
+#define Z_External_espec1 12
+#define Z_External_summary 13
+#define Z_External_OPAC 14
+#define Z_External_searchResult1 15
+#define Z_External_update 16
+#define Z_External_dateTime 17
+#define Z_External_universeReport 18
+#define Z_External_ESAdmin 19
+    union
+    {
+	/* Generic types */
+	Odr_any *single_ASN1_type;
+	Odr_oct *octet_aligned;
+	Odr_bitmask *arbitrary;
+
+	/* Specific types */
+	Z_SUTRS *sutrs;
+	Z_ExplainRecord *explainRecord;
+	Z_ResourceReport1 *resourceReport1;
+	Z_ResourceReport2 *resourceReport2;
+	Z_PromptObject1 *promptObject1;
+	Z_GenericRecord *grs1;
+	Z_TaskPackage *extendedService;
+	Z_ItemOrder *itemOrder;
+	Z_DiagnosticFormat *diag1;
+	Z_Espec1 *espec1;
+	Z_BriefBib *summary;
+	Z_SearchInfoReport *searchResult1;
+	Z_IUUpdate *update;
+	Z_DateTime *dateTime;
+        Z_UniverseReport *universeReport;
+#ifdef ASN_COMPILED
+        Z_Admin *adminService;
+#endif
+    } u;
+};
+
+
+YAZ_EXPORT int z_External(ODR o, Z_External **p, int opt, const char *name);
+YAZ_EXPORT Z_ext_typeent *z_ext_getentbyref(oid_value val);
+YAZ_EXPORT Z_External *z_ext_record(ODR o, int format, const char *buf,
+				    int len);
+
+YAZ_END_CDECL
+
+#endif