RFC 7895:

* Changed Netconf hello to single capabilty urn:ietf:params:netconf:capability:yang-library:1.0 according to YANG 1.1 RFC7950 Sec 5.6.4.
  * Set by option: CLICON_MODULE_LIBRARY_RFC7895 - enabled by default
  * Option CLICON_MODULE_SET_ID is set and changed when modules change.

lib/clixon/clixon.h.in

@@ -75,6 +75,7 @@
 #include <clixon/clixon_file.h>
 #include <clixon/clixon_xml.h>
 #include <clixon/clixon_xml_sort.h>
+#include <clixon/clixon_yang_module.h>
 #include <clixon/clixon_stream.h>
 #include <clixon/clixon_proto.h>
 #include <clixon/clixon_proto_client.h>

lib/clixon/clixon_yang_module.h

@@ -0,0 +1,57 @@
+/*
+ *
+  ***** BEGIN LICENSE BLOCK *****
+ 
+  Copyright (C) 2009-2018 Olof Hagsand and Benny Holmgren
+
+  This file is part of CLIXON.
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+
+  Alternatively, the contents of this file may be used under the terms of
+  the GNU General Public License Version 3 or later (the "GPL"),
+  in which case the provisions of the GPL are applicable instead
+  of those above. If you wish to allow use of your version of this file only
+  under the terms of the GPL, and not to allow others to
+  use your version of this file under the terms of Apache License version 2, 
+  indicate your decision by deleting the provisions above and replace them with
+  the  notice and other provisions required by the GPL. If you do not delete
+  the provisions above, a recipient may use your version of this file under
+  the terms of any one of the Apache License version 2 or the GPL.
+
+  ***** END LICENSE BLOCK *****
+
+ * Yang module and feature handling
+ * @see https://tools.ietf.org/html/rfc7895
+ */
+
+#ifndef _CLIXON_YANG_MODULE_H_
+#define _CLIXON_YANG_MODULE_H_
+
+/*
+ * Constants
+ */
+
+/*
+ * Types
+ */
+
+
+/*
+ * Prototypes
+ */
+int yang_modules_init(clicon_handle h);
+char *yang_modules_revision(clicon_handle h);
+int yang_modules_state_get(clicon_handle h, yang_spec *yspec, cxobj **xret);
+
+#endif  /* _CLIXON_YANG_MODULE_H_ */