config: support enum value and add ietf yang files

6 files changed, 1653 insertions, 15 deletions

diff --git a/config/bgp_configs.go b/config/bgp_configs.go
index e2ed169d..dee0b9a5 100644
--- a/config/bgp_configs.go
+++ b/config/bgp_configs.go
@@ -22,8 +22,7 @@ import "time"
 type PeerTypeDef int
 
 const (
-	_ = iota
-	PEER_TYPE_INTERNAL
+	PEER_TYPE_INTERNAL = iota
 	PEER_TYPE_EXTERNAL
 )
 
@@ -37,8 +36,7 @@ type Percentage uint8
 type RemovePrivateAsOption int
 
 const (
-	_ = iota
-	REMOVE_PRIVATE_AS_OPTION_ALL
+	REMOVE_PRIVATE_AS_OPTION_ALL = iota
 	REMOVE_PRIVATE_AS_OPTION_REPLACE
 )
 
@@ -55,8 +53,7 @@ type StdCommunityAttrType string
 type MatchSetOptionsType int
 
 const (
-	_ = iota
-	MATCH_SET_OPTIONS_TYPE_ANY
+	MATCH_SET_OPTIONS_TYPE_ANY = iota
 	MATCH_SET_OPTIONS_TYPE_ALL
 	MATCH_SET_OPTIONS_TYPE_INVERT
 )
@@ -65,8 +62,7 @@ const (
 type SetCommunityOptionType int
 
 const (
-	_ = iota
-	SET_COMMUNITY_OPTION_TYPE_ADD
+	SET_COMMUNITY_OPTION_TYPE_ADD = iota
 	SET_COMMUNITY_OPTION_TYPE_REMOVE
 	SET_COMMUNITY_OPTION_TYPE_REPLACE
 	SET_COMMUNITY_OPTION_TYPE_NULL
@@ -82,17 +78,16 @@ type ExtCommunityAttrType string
 type BgpOriginAttrType int
 
 const (
-	BGP_ORIGIN_ATTR_TYPE_IGP = iota
-	BGP_ORIGIN_ATTR_TYPE_EGP
-	BGP_ORIGIN_ATTR_TYPE_INCOMPLETE
+	BGP_ORIGIN_ATTR_TYPE_IGP        = 0
+	BGP_ORIGIN_ATTR_TYPE_EGP        = 1
+	BGP_ORIGIN_ATTR_TYPE_INCOMPLETE = 2
 )
 
 // typedef for typedef bgp-policy:well-known-community-attr
 type WellKnownCommunityAttr int
 
 const (
-	_ = iota
-	WELL_KNOWN_COMMUNITY_ATTR_INTERNET
+	WELL_KNOWN_COMMUNITY_ATTR_INTERNET = iota
 	WELL_KNOWN_COMMUNITY_ATTR_NO_EXPORT
 	WELL_KNOWN_COMMUNITY_ATTR_NO_ADVERTISE
 	WELL_KNOWN_COMMUNITY_ATTR_NO_EXPORT_SUBCONFED
diff --git a/tools/pyang_plugins/bgpyang2golang.py b/tools/pyang_plugins/bgpyang2golang.py
index bf648124..3c09a356 100644
--- a/tools/pyang_plugins/bgpyang2golang.py
+++ b/tools/pyang_plugins/bgpyang2golang.py
@@ -273,9 +273,19 @@ def emit_typedef(ctx, module):
 
             const_prefix = convert_const_prefix(type_name_org)
             print >> o, 'const ('
-            print >> o, ' _ = iota'
+
+            already_added_iota = False
             for sub in t.substmts:
-                print >> o, ' %s_%s' % (const_prefix, sub.arg)
+                if sub.search_one('value'):
+                    enum_value_part = " = "+sub.search_one('value').arg
+                else:
+                    if already_added_iota:
+                        enum_value_part = ""
+                    else:
+                        enum_value_part = " = iota"
+                        already_added_iota = True
+
+                print >> o, ' %s_%s%s' % (const_prefix, sub.arg, enum_value_part)
             print >> o, ')'
         elif t.arg == 'union':
             print >> o, '// typedef for typedef %s:%s'\
diff --git a/tools/yang/ietf-inet-types.yang b/tools/yang/ietf-inet-types.yang
new file mode 100644
index 00000000..5c6f139a
--- /dev/null
+++ b/tools/yang/ietf-inet-types.yang
@@ -0,0 +1,457 @@
+module ietf-inet-types {
+
+  namespace "urn:ietf:params:xml:ns:yang:ietf-inet-types";
+  prefix "inet";
+
+  organization
+   "IETF NETMOD (NETCONF Data Modeling Language) Working Group";
+
+  contact
+   "WG Web:   <http://tools.ietf.org/wg/netmod/>
+    WG List:  <mailto:netmod@ietf.org>
+
+    WG Chair: David Kessens
+              <mailto:david.kessens@nsn.com>
+
+    WG Chair: Juergen Schoenwaelder
+              <mailto:j.schoenwaelder@jacobs-university.de>
+
+    Editor:   Juergen Schoenwaelder
+              <mailto:j.schoenwaelder@jacobs-university.de>";
+
+  description
+   "This module contains a collection of generally useful derived
+    YANG data types for Internet addresses and related things.
+
+    Copyright (c) 2013 IETF Trust and the persons identified as
+    authors of the code.  All rights reserved.
+
+    Redistribution and use in source and binary forms, with or
+    without modification, is permitted pursuant to, and subject
+    to the license terms contained in, the Simplified BSD License
+    set forth in Section 4.c of the IETF Trust's Legal Provisions
+    Relating to IETF Documents
+    (http://trustee.ietf.org/license-info).
+
+    This version of this YANG module is part of RFC 6991; see
+    the RFC itself for full legal notices.";
+
+  revision 2013-07-15 {
+    description
+     "This revision adds the following new data types:
+      - ip-address-no-zone
+      - ipv4-address-no-zone
+      - ipv6-address-no-zone";
+    reference
+     "RFC 6991: Common YANG Data Types";
+  }
+
+  revision 2010-09-24 {
+    description
+     "Initial revision.";
+    reference
+     "RFC 6021: Common YANG Data Types";
+  }
+
+  /*** collection of types related to protocol fields ***/
+
+  typedef ip-version {
+    type enumeration {
+      enum unknown {
+        value "0";
+        description
+         "An unknown or unspecified version of the Internet
+          protocol.";
+      }
+      enum ipv4 {
+        value "1";
+        description
+         "The IPv4 protocol as defined in RFC 791.";
+      }
+      enum ipv6 {
+        value "2";
+        description
+         "The IPv6 protocol as defined in RFC 2460.";
+      }
+    }
+    description
+     "This value represents the version of the IP protocol.
+
+      In the value set and its semantics, this type is equivalent
+      to the InetVersion textual convention of the SMIv2.";
+    reference
+     "RFC  791: Internet Protocol
+      RFC 2460: Internet Protocol, Version 6 (IPv6) Specification
+      RFC 4001: Textual Conventions for Internet Network Addresses";
+  }
+
+  typedef dscp {
+    type uint8 {
+      range "0..63";
+    }
+    description
+     "The dscp type represents a Differentiated Services Code Point
+      that may be used for marking packets in a traffic stream.
+      In the value set and its semantics, this type is equivalent
+      to the Dscp textual convention of the SMIv2.";
+    reference
+     "RFC 3289: Management Information Base for the Differentiated
+                Services Architecture
+      RFC 2474: Definition of the Differentiated Services Field
+                (DS Field) in the IPv4 and IPv6 Headers
+      RFC 2780: IANA Allocation Guidelines For Values In
+                the Internet Protocol and Related Headers";
+  }
+
+  typedef ipv6-flow-label {
+    type uint32 {
+      range "0..1048575";
+    }
+    description
+     "The ipv6-flow-label type represents the flow identifier or Flow
+      Label in an IPv6 packet header that may be used to
+      discriminate traffic flows.
+
+      In the value set and its semantics, this type is equivalent
+      to the IPv6FlowLabel textual convention of the SMIv2.";
+    reference
+     "RFC 3595: Textual Conventions for IPv6 Flow Label
+      RFC 2460: Internet Protocol, Version 6 (IPv6) Specification";
+  }
+
+  typedef port-number {
+    type uint16 {
+      range "0..65535";
+    }
+    description
+     "The port-number type represents a 16-bit port number of an
+      Internet transport-layer protocol such as UDP, TCP, DCCP, or
+      SCTP.  Port numbers are assigned by IANA.  A current list of
+      all assignments is available from <http://www.iana.org/>.
+
+      Note that the port number value zero is reserved by IANA.  In
+      situations where the value zero does not make sense, it can
+      be excluded by subtyping the port-number type.
+      In the value set and its semantics, this type is equivalent
+      to the InetPortNumber textual convention of the SMIv2.";
+    reference
+     "RFC  768: User Datagram Protocol
+      RFC  793: Transmission Control Protocol
+      RFC 4960: Stream Control Transmission Protocol
+      RFC 4340: Datagram Congestion Control Protocol (DCCP)
+      RFC 4001: Textual Conventions for Internet Network Addresses";
+  }
+
+  /*** collection of types related to autonomous systems ***/
+
+  typedef as-number {
+    type uint32;
+    description
+     "The as-number type represents autonomous system numbers
+      which identify an Autonomous System (AS).  An AS is a set
+      of routers under a single technical administration, using
+      an interior gateway protocol and common metrics to route
+      packets within the AS, and using an exterior gateway
+      protocol to route packets to other ASes.  IANA maintains
+      the AS number space and has delegated large parts to the
+      regional registries.
+
+      Autonomous system numbers were originally limited to 16
+      bits.  BGP extensions have enlarged the autonomous system
+      number space to 32 bits.  This type therefore uses an uint32
+      base type without a range restriction in order to support
+      a larger autonomous system number space.
+
+      In the value set and its semantics, this type is equivalent
+      to the InetAutonomousSystemNumber textual convention of
+      the SMIv2.";
+    reference
+     "RFC 1930: Guidelines for creation, selection, and registration
+                of an Autonomous System (AS)
+      RFC 4271: A Border Gateway Protocol 4 (BGP-4)
+      RFC 4001: Textual Conventions for Internet Network Addresses
+      RFC 6793: BGP Support for Four-Octet Autonomous System (AS)
+                Number Space";
+  }
+
+  /*** collection of types related to IP addresses and hostnames ***/
+
+  typedef ip-address {
+    type union {
+      type inet:ipv4-address;
+      type inet:ipv6-address;
+    }
+    description
+     "The ip-address type represents an IP address and is IP
+      version neutral.  The format of the textual representation
+      implies the IP version.  This type supports scoped addresses
+      by allowing zone identifiers in the address format.";
+    reference
+     "RFC 4007: IPv6 Scoped Address Architecture";
+  }
+
+  typedef ipv4-address {
+    type string {
+      pattern
+        '(([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\.){3}'
+      +  '([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])'
+      + '(%[\p{N}\p{L}]+)?';
+    }
+    description
+      "The ipv4-address type represents an IPv4 address in
+       dotted-quad notation.  The IPv4 address may include a zone
+       index, separated by a % sign.
+
+       The zone index is used to disambiguate identical address
+       values.  For link-local addresses, the zone index will
+       typically be the interface index number or the name of an
+       interface.  If the zone index is not present, the default
+       zone of the device will be used.
+
+       The canonical format for the zone index is the numerical
+       format";
+  }
+
+  typedef ipv6-address {
+    type string {
+      pattern '((:|[0-9a-fA-F]{0,4}):)([0-9a-fA-F]{0,4}:){0,5}'
+            + '((([0-9a-fA-F]{0,4}:)?(:|[0-9a-fA-F]{0,4}))|'
+            + '(((25[0-5]|2[0-4][0-9]|[01]?[0-9]?[0-9])\.){3}'
+            + '(25[0-5]|2[0-4][0-9]|[01]?[0-9]?[0-9])))'
+            + '(%[\p{N}\p{L}]+)?';
+      pattern '(([^:]+:){6}(([^:]+:[^:]+)|(.*\..*)))|'
+            + '((([^:]+:)*[^:]+)?::(([^:]+:)*[^:]+)?)'
+            + '(%.+)?';
+    }
+    description
+     "The ipv6-address type represents an IPv6 address in full,
+      mixed, shortened, and shortened-mixed notation.  The IPv6
+      address may include a zone index, separated by a % sign.
+
+      The zone index is used to disambiguate identical address
+      values.  For link-local addresses, the zone index will
+      typically be the interface index number or the name of an
+      interface.  If the zone index is not present, the default
+      zone of the device will be used.
+
+      The canonical format of IPv6 addresses uses the textual
+      representation defined in Section 4 of RFC 5952.  The
+      canonical format for the zone index is the numerical
+      format as described in Section 11.2 of RFC 4007.";
+    reference
+     "RFC 4291: IP Version 6 Addressing Architecture
+      RFC 4007: IPv6 Scoped Address Architecture
+      RFC 5952: A Recommendation for IPv6 Address Text
+                Representation";
+  }
+
+  typedef ip-address-no-zone {
+    type union {
+      type inet:ipv4-address-no-zone;
+      type inet:ipv6-address-no-zone;
+    }
+    description
+     "The ip-address-no-zone type represents an IP address and is
+      IP version neutral.  The format of the textual representation
+      implies the IP version.  This type does not support scoped
+      addresses since it does not allow zone identifiers in the
+      address format.";
+    reference
+     "RFC 4007: IPv6 Scoped Address Architecture";
+  }
+
+  typedef ipv4-address-no-zone {
+    type inet:ipv4-address {
+      pattern '[0-9\.]*';
+    }
+    description
+      "An IPv4 address without a zone index.  This type, derived from
+       ipv4-address, may be used in situations where the zone is
+       known from the context and hence no zone index is needed.";
+  }
+
+  typedef ipv6-address-no-zone {
+    type inet:ipv6-address {
+      pattern '[0-9a-fA-F:\.]*';
+    }
+    description
+      "An IPv6 address without a zone index.  This type, derived from
+       ipv6-address, may be used in situations where the zone is
+       known from the context and hence no zone index is needed.";
+    reference
+     "RFC 4291: IP Version 6 Addressing Architecture
+      RFC 4007: IPv6 Scoped Address Architecture
+      RFC 5952: A Recommendation for IPv6 Address Text
+                Representation";
+  }
+
+  typedef ip-prefix {
+    type union {
+      type inet:ipv4-prefix;
+      type inet:ipv6-prefix;
+    }
+    description
+     "The ip-prefix type represents an IP prefix and is IP
+      version neutral.  The format of the textual representations
+      implies the IP version.";
+  }
+
+  typedef ipv4-prefix {
+    type string {
+      pattern
+         '(([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\.){3}'
+       +  '([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])'
+       + '/(([0-9])|([1-2][0-9])|(3[0-2]))';
+    }
+    description
+     "The ipv4-prefix type represents an IPv4 address prefix.
+      The prefix length is given by the number following the
+      slash character and must be less than or equal to 32.
+
+      A prefix length value of n corresponds to an IP address
+      mask that has n contiguous 1-bits from the most
+      significant bit (MSB) and all other bits set to 0.
+
+      The canonical format of an IPv4 prefix has all bits of
+      the IPv4 address set to zero that are not part of the
+      IPv4 prefix.";
+  }
+
+  typedef ipv6-prefix {
+    type string {
+      pattern '((:|[0-9a-fA-F]{0,4}):)([0-9a-fA-F]{0,4}:){0,5}'
+            + '((([0-9a-fA-F]{0,4}:)?(:|[0-9a-fA-F]{0,4}))|'
+            + '(((25[0-5]|2[0-4][0-9]|[01]?[0-9]?[0-9])\.){3}'
+            + '(25[0-5]|2[0-4][0-9]|[01]?[0-9]?[0-9])))'
+            + '(/(([0-9])|([0-9]{2})|(1[0-1][0-9])|(12[0-8])))';
+      pattern '(([^:]+:){6}(([^:]+:[^:]+)|(.*\..*)))|'
+            + '((([^:]+:)*[^:]+)?::(([^:]+:)*[^:]+)?)'
+            + '(/.+)';
+    }
+    description
+     "The ipv6-prefix type represents an IPv6 address prefix.
+      The prefix length is given by the number following the
+      slash character and must be less than or equal to 128.
+
+      A prefix length value of n corresponds to an IP address
+      mask that has n contiguous 1-bits from the most
+      significant bit (MSB) and all other bits set to 0.
+
+      The IPv6 address should have all bits that do not belong
+      to the prefix set to zero.
+
+      The canonical format of an IPv6 prefix has all bits of
+      the IPv6 address set to zero that are not part of the
+      IPv6 prefix.  Furthermore, the IPv6 address is represented
+      as defined in Section 4 of RFC 5952.";
+    reference
+     "RFC 5952: A Recommendation for IPv6 Address Text
+                Representation";
+  }
+
+  /*** collection of domain name and URI types ***/
+
+  typedef domain-name {
+    type string {
+      pattern
+        '((([a-zA-Z0-9_]([a-zA-Z0-9\-_]){0,61})?[a-zA-Z0-9]\.)*'
+      + '([a-zA-Z0-9_]([a-zA-Z0-9\-_]){0,61})?[a-zA-Z0-9]\.?)'
+      + '|\.';
+      length "1..253";
+    }
+    description
+     "The domain-name type represents a DNS domain name.  The
+      name SHOULD be fully qualified whenever possible.
+
+      Internet domain names are only loosely specified.  Section
+      3.5 of RFC 1034 recommends a syntax (modified in Section
+      2.1 of RFC 1123).  The pattern above is intended to allow
+      for current practice in domain name use, and some possible
+      future expansion.  It is designed to hold various types of
+      domain names, including names used for A or AAAA records
+      (host names) and other records, such as SRV records.  Note
+      that Internet host names have a stricter syntax (described
+      in RFC 952) than the DNS recommendations in RFCs 1034 and
+      1123, and that systems that want to store host names in
+      schema nodes using the domain-name type are recommended to
+      adhere to this stricter standard to ensure interoperability.
+
+      The encoding of DNS names in the DNS protocol is limited
+      to 255 characters.  Since the encoding consists of labels
+      prefixed by a length bytes and there is a trailing NULL
+      byte, only 253 characters can appear in the textual dotted
+      notation.
+
+      The description clause of schema nodes using the domain-name
+      type MUST describe when and how these names are resolved to
+      IP addresses.  Note that the resolution of a domain-name value
+      may require to query multiple DNS records (e.g., A for IPv4
+      and AAAA for IPv6).  The order of the resolution process and
+      which DNS record takes precedence can either be defined
+      explicitly or may depend on the configuration of the
+      resolver.
+
+      Domain-name values use the US-ASCII encoding.  Their canonical
+      format uses lowercase US-ASCII characters.  Internationalized
+      domain names MUST be A-labels as per RFC 5890.";
+    reference
+     "RFC  952: DoD Internet Host Table Specification
+      RFC 1034: Domain Names - Concepts and Facilities
+      RFC 1123: Requirements for Internet Hosts -- Application
+                and Support
+      RFC 2782: A DNS RR for specifying the location of services
+                (DNS SRV)
+      RFC 5890: Internationalized Domain Names in Applications
+                (IDNA): Definitions and Document Framework";
+  }
+
+  typedef host {
+    type union {
+      type inet:ip-address;
+      type inet:domain-name;
+    }
+    description
+     "The host type represents either an IP address or a DNS
+      domain name.";
+  }
+
+  typedef uri {
+    type string;
+    description
+     "The uri type represents a Uniform Resource Identifier
+      (URI) as defined by STD 66.
+
+      Objects using the uri type MUST be in US-ASCII encoding,
+      and MUST be normalized as described by RFC 3986 Sections
+      6.2.1, 6.2.2.1, and 6.2.2.2.  All unnecessary
+      percent-encoding is removed, and all case-insensitive
+      characters are set to lowercase except for hexadecimal
+      digits, which are normalized to uppercase as described in
+      Section 6.2.2.1.
+
+      The purpose of this normalization is to help provide
+      unique URIs.  Note that this normalization is not
+      sufficient to provide uniqueness.  Two URIs that are
+      textually distinct after this normalization may still be
+      equivalent.
+
+      Objects using the uri type may restrict the schemes that
+      they permit.  For example, 'data:' and 'urn:' schemes
+      might not be appropriate.
+
+      A zero-length URI is not a valid URI.  This can be used to
+      express 'URI absent' where required.
+
+      In the value set and its semantics, this type is equivalent
+      to the Uri SMIv2 textual convention defined in RFC 5017.";
+    reference
+     "RFC 3986: Uniform Resource Identifier (URI): Generic Syntax
+      RFC 3305: Report from the Joint W3C/IETF URI Planning Interest
+                Group: Uniform Resource Identifiers (URIs), URLs,
+                and Uniform Resource Names (URNs): Clarifications
+                and Recommendations
+      RFC 5017: MIB Textual Conventions for Uniform Resource
+                Identifiers (URIs)";
+  }
+
+}
diff --git a/tools/yang/ietf-netconf-monitoring.yang b/tools/yang/ietf-netconf-monitoring.yang
new file mode 100644
index 00000000..8d2380e7
--- /dev/null
+++ b/tools/yang/ietf-netconf-monitoring.yang
@@ -0,0 +1,558 @@
+module ietf-netconf-monitoring {
+
+  namespace "urn:ietf:params:xml:ns:yang:ietf-netconf-monitoring";
+  prefix "ncm";
+
+  import ietf-yang-types { prefix yang; }
+  import ietf-inet-types { prefix inet; }
+
+  organization
+    "IETF NETCONF (Network Configuration) Working Group";
+
+  contact
+    "WG Web:   <http://tools.ietf.org/wg/netconf/>
+     WG List:  <mailto:netconf@ietf.org>
+
+     WG Chair: Mehmet Ersue
+               <mailto:mehmet.ersue@nsn.com>
+
+     WG Chair: Bert Wijnen
+               <mailto:bertietf@bwijnen.net>
+
+     Editor:   Mark Scott
+               <mailto:mark.scott@ericsson.com>
+
+     Editor:   Martin Bjorklund
+               <mailto:mbj@tail-f.com>";
+
+  description
+    "NETCONF Monitoring Module.
+     All elements in this module are read-only.
+
+     Copyright (c) 2010 IETF Trust and the persons identified as
+     authors of the code. All rights reserved.
+
+     Redistribution and use in source and binary forms, with or
+     without modification, is permitted pursuant to, and subject
+     to the license terms contained in, the Simplified BSD
+     License set forth in Section 4.c of the IETF Trust's
+     Legal Provisions Relating to IETF Documents
+     (http://trustee.ietf.org/license-info).
+
+     This version of this YANG module is part of RFC 6022; see
+     the RFC itself for full legal notices.";
+
+  revision 2010-10-04 {
+    description
+      "Initial revision.";
+    reference
+      "RFC 6022: YANG Module for NETCONF Monitoring";
+  }
+
+  typedef netconf-datastore-type {
+    type enumeration {
+      enum running;
+      enum candidate;
+      enum startup;
+    }
+    description
+      "Enumeration of possible NETCONF datastore types.";
+    reference
+      "RFC 4741: NETCONF Configuration Protocol";
+  }
+
+  identity transport {
+    description
+      "Base identity for NETCONF transport types.";
+  }
+
+  identity netconf-ssh {
+    base transport;
+    description
+      "NETCONF over Secure Shell (SSH).";
+    reference
+      "RFC 4742: Using the NETCONF Configuration Protocol
+                 over Secure SHell (SSH)";
+  }
+
+  identity netconf-soap-over-beep {
+    base transport;
+    description
+      "NETCONF over Simple Object Access Protocol (SOAP) over
+       Blocks Extensible Exchange Protocol (BEEP).";
+    reference
+      "RFC 4743: Using NETCONF over the Simple Object
+                 Access Protocol (SOAP)";
+  }
+
+  identity netconf-soap-over-https {
+    base transport;
+    description
+      "NETCONF over Simple Object Access Protocol (SOAP)
+      over Hypertext Transfer Protocol Secure (HTTPS).";
+    reference
+      "RFC 4743: Using NETCONF over the Simple Object
+                 Access Protocol (SOAP)";
+  }
+
+  identity netconf-beep {
+    base transport;
+    description
+      "NETCONF over Blocks Extensible Exchange Protocol (BEEP).";
+    reference
+      "RFC 4744: Using the NETCONF Protocol over the
+                 Blocks Extensible Exchange Protocol (BEEP)";
+  }
+
+  identity netconf-tls {
+    base transport;
+    description
+      "NETCONF over Transport Layer Security (TLS).";
+    reference
+      "RFC 5539: NETCONF over Transport Layer Security (TLS)";
+  }
+
+  identity schema-format {
+    description
+      "Base identity for data model schema languages.";
+  }
+
+  identity xsd {
+    base schema-format;
+    description
+      "W3C XML Schema Definition.";
+    reference
+      "W3C REC REC-xmlschema-1-20041028:
+         XML Schema Part 1: Structures";
+  }
+
+  identity yang {
+    base schema-format;
+    description
+      "The YANG data modeling language for NETCONF.";
+    reference
+      "RFC 6020:  YANG - A Data Modeling Language for the
+                  Network Configuration Protocol (NETCONF)";
+  }
+
+  identity yin {
+    base schema-format;
+    description
+      "The YIN syntax for YANG.";
+    reference
+      "RFC 6020:  YANG - A Data Modeling Language for the
+                  Network Configuration Protocol (NETCONF)";
+  }
+
+  identity rng {
+    base schema-format;
+    description
+      "Regular Language for XML Next Generation (RELAX NG).";
+    reference
+      "ISO/IEC 19757-2:2008: RELAX NG";
+  }
+
+  identity rnc {
+    base schema-format;
+    description
+      "Relax NG Compact Syntax";
+    reference
+      "ISO/IEC 19757-2:2008: RELAX NG";
+  }
+
+  grouping common-counters {
+    description
+      "Counters that exist both per session, and also globally,
+       accumulated from all sessions.";
+
+    leaf in-rpcs {
+      type yang:zero-based-counter32;
+      description
+        "Number of correct <rpc> messages received.";
+    }
+    leaf in-bad-rpcs {
+      type yang:zero-based-counter32;
+      description
+        "Number of messages received when an <rpc> message was expected,
+         that were not correct <rpc> messages.  This includes XML parse
+         errors and errors on the rpc layer.";
+    }
+    leaf out-rpc-errors {
+      type yang:zero-based-counter32;
+      description
+        "Number of <rpc-reply> messages sent that contained an
+         <rpc-error> element.";
+    }
+    leaf out-notifications {
+      type yang:zero-based-counter32;
+      description
+        "Number of <notification> messages sent.";
+    }
+  }
+
+  container netconf-state {
+    config false;
+    description
+      "The netconf-state container is the root of the monitoring
+       data model.";
+
+    container capabilities {
+      description
+        "Contains the list of NETCONF capabilities supported by the
+         server.";
+
+      leaf-list capability {
+        type inet:uri;
+        description
+          "List of NETCONF capabilities supported by the server.";
+      }
+    }
+
+    container datastores {
+      description
+        "Contains the list of NETCONF configuration datastores.";
+
+      list datastore {
+        key name;
+        description
+          "List of NETCONF configuration datastores supported by
+           the NETCONF server and related information.";
+
+        leaf name {
+          type netconf-datastore-type;
+          description
+            "Name of the datastore associated with this list entry.";
+        }
+        container locks {
+          presence
+            "This container is present only if the datastore
+             is locked.";
+          description
+            "The NETCONF <lock> and <partial-lock> operations allow
+             a client to lock specific resources in a datastore.  The
+             NETCONF server will prevent changes to the locked
+             resources by all sessions except the one that acquired
+             the lock(s).
+
+             Monitoring information is provided for each datastore
+             entry including details such as the session that acquired
+             the lock, the type of lock (global or partial) and the
+             list of locked resources.  Multiple locks per datastore
+             are supported.";
+
+          grouping lock-info {
+            description
+              "Lock related parameters, common to both global and
+               partial locks.";
+
+            leaf locked-by-session {
+              type uint32;
+              mandatory true;
+              description
+                "The session ID of the session that has locked
+                 this resource.  Both a global lock and a partial
+                 lock MUST contain the NETCONF session-id.
+
+                 If the lock is held by a session that is not managed
+                 by the NETCONF server (e.g., a CLI session), a session
+                 id of 0 (zero) is reported.";
+              reference
+                "RFC 4741: NETCONF Configuration Protocol";
+            }
+            leaf locked-time {
+              type yang:date-and-time;
+              mandatory true;
+              description
+                "The date and time of when the resource was
+                 locked.";
+            }
+          }
+
+          choice lock-type {
+            description
+              "Indicates if a global lock or a set of partial locks
+               are set.";
+
+            container global-lock {
+              description
+                "Present if the global lock is set.";
+              uses lock-info;
+            }
+
+            list partial-lock {
+              key lock-id;
+              description
+                "List of partial locks.";
+              reference
+                "RFC 5717: Partial Lock Remote Procedure Call (RPC) for
+                           NETCONF";
+
+              leaf lock-id {
+                type uint32;
+                description
+                  "This is the lock id returned in the <partial-lock>
+                   response.";
+              }
+              uses lock-info;
+              leaf-list select {
+                type yang:xpath1.0;
+                min-elements 1;
+                description
+                  "The xpath expression that was used to request
+                   the lock.  The select expression indicates the
+                   original intended scope of the lock.";
+              }
+              leaf-list locked-node {
+                type instance-identifier;
+                description
+                  "The list of instance-identifiers (i.e., the
+                   locked nodes).
+
+                   The scope of the partial lock is defined by the list
+                   of locked nodes.";
+              }
+            }
+          }
+        }
+      }
+    }
+
+    container schemas {
+      description
+        "Contains the list of data model schemas supported by the
+         server.";
+
+      list schema {
+        key "identifier version format";
+
+        description
+          "List of data model schemas supported by the server.";
+
+        leaf identifier {
+          type string;
+          description
+            "Identifier to uniquely reference the schema.  The
+             identifier is used in the <get-schema> operation and may
+             be used for other purposes such as file retrieval.
+
+             For modeling languages that support or require a data
+             model name (e.g., YANG module name) the identifier MUST
+             match that name.  For YANG data models, the identifier is
+             the name of the module or submodule.  In other cases, an
+             identifier such as a filename MAY be used instead.";
+        }
+        leaf version {
+          type string;
+          description
+            "Version of the schema supported.  Multiple versions MAY be
+             supported simultaneously by a NETCONF server.  Each
+             version MUST be reported individually in the schema list,
+             i.e., with same identifier, possibly different location,
+             but different version.
+
+             For YANG data models, version is the value of the most
+             recent YANG 'revision' statement in the module or
+             submodule, or the empty string if no 'revision' statement
+             is present.";
+        }
+        leaf format {
+          type identityref {
+            base schema-format;
+          }
+          description
+            "The data modeling language the schema is written
+             in (currently xsd, yang, yin, rng, or rnc).
+             For YANG data models, 'yang' format MUST be supported and
+             'yin' format MAY also be provided.";
+        }
+        leaf namespace {
+          type inet:uri;
+          mandatory true;
+          description
+            "The XML namespace defined by the data model.
+
+             For YANG data models, this is the module's namespace.
+             If the list entry describes a submodule, this field
+             contains the namespace of the module to which the
+             submodule belongs.";
+        }
+        leaf-list location {
+          type union {
+            type enumeration {
+              enum "NETCONF";
+            }
+            type inet:uri;
+          }
+          description
+            "One or more locations from which the schema can be
+             retrieved.  This list SHOULD contain at least one
+             entry per schema.
+
+             A schema entry may be located on a remote file system
+             (e.g., reference to file system for ftp retrieval) or
+             retrieved directly from a server supporting the
+             <get-schema> operation (denoted by the value 'NETCONF').";
+        }
+      }
+    }
+
+    container sessions {
+      description
+        "The sessions container includes session-specific data for
+         NETCONF management sessions.  The session list MUST include
+         all currently active NETCONF sessions.";
+
+      list session {
+        key session-id;
+        description
+          "All NETCONF sessions managed by the NETCONF server
+           MUST be reported in this list.";
+
+        leaf session-id {
+          type uint32 {
+            range "1..max";
+          }
+          description
+            "Unique identifier for the session.  This value is the
+             NETCONF session identifier, as defined in RFC 4741.";
+          reference
+            "RFC 4741: NETCONF Configuration Protocol";
+        }
+        leaf transport {
+          type identityref {
+            base transport;
+          }
+          mandatory true;
+          description
+            "Identifies the transport for each session, e.g.,
+            'netconf-ssh', 'netconf-soap', etc.";
+        }
+        leaf username  {
+          type string;
+          mandatory true;
+          description
+            "The username is the client identity that was authenticated
+            by the NETCONF transport protocol.  The algorithm used to
+            derive the username is NETCONF transport protocol specific
+            and in addition specific to the authentication mechanism
+            used by the NETCONF transport protocol.";
+        }
+        leaf source-host {
+          type inet:host;
+          description
+            "Host identifier of the NETCONF client.  The value
+             returned is implementation specific (e.g., hostname,
+             IPv4 address, IPv6 address)";
+        }
+        leaf login-time {
+          type yang:date-and-time;
+          mandatory true;
+          description
+            "Time at the server at which the session was established.";
+        }
+        uses common-counters {
+          description
+            "Per-session counters.  Zero based with following reset
+             behaviour:
+               - at start of a session
+               - when max value is reached";
+        }
+      }
+    }
+
+    container statistics {
+      description
+        "Statistical data pertaining to the NETCONF server.";
+
+      leaf netconf-start-time {
+        type yang:date-and-time;
+        description
+          "Date and time at which the management subsystem was
+           started.";
+      }
+      leaf in-bad-hellos {
+        type yang:zero-based-counter32;
+        description
+          "Number of sessions silently dropped because an
+          invalid <hello> message was received.  This includes <hello>
+          messages with a 'session-id' attribute, bad namespace, and
+          bad capability declarations.";
+      }
+      leaf in-sessions {
+        type yang:zero-based-counter32;
+        description
+          "Number of sessions started.  This counter is incremented
+           when a <hello> message with a <session-id> is sent.
+
+          'in-sessions' - 'in-bad-hellos' =
+              'number of correctly started netconf sessions'";
+      }
+      leaf dropped-sessions {
+        type yang:zero-based-counter32;
+        description
+          "Number of sessions that were abnormally terminated, e.g.,
+           due to idle timeout or transport close.  This counter is not
+           incremented when a session is properly closed by a
+           <close-session> operation, or killed by a <kill-session>
+           operation.";
+      }
+      uses common-counters {
+        description
+          "Global counters, accumulated from all sessions.
+           Zero based with following reset behaviour:
+             - re-initialization of NETCONF server
+             - when max value is reached";
+      }
+    }
+  }
+
+  rpc get-schema {
+    description
+      "This operation is used to retrieve a schema from the
+       NETCONF server.
+
+       Positive Response:
+         The NETCONF server returns the requested schema.
+
+       Negative Response:
+         If requested schema does not exist, the <error-tag> is
+         'invalid-value'.
+
+         If more than one schema matches the requested parameters, the
+         <error-tag> is 'operation-failed', and <error-app-tag> is
+         'data-not-unique'.";
+
+    input {
+      leaf identifier {
+        type string;
+        mandatory true;
+        description
+          "Identifier for the schema list entry.";
+      }
+      leaf version {
+        type string;
+        description
+          "Version of the schema requested.  If this parameter is not
+           present, and more than one version of the schema exists on
+           the server, a 'data-not-unique' error is returned, as
+           described above.";
+      }
+      leaf format {
+        type identityref {
+          base schema-format;
+        }
+        description
+           "The data modeling language of the schema.  If this
+            parameter is not present, and more than one formats of
+            the schema exists on the server, a 'data-not-unique' error
+            is returned, as described above.";
+      }
+    }
+    output {
+        anyxml data {
+          description
+            "Contains the schema content.";
+      }
+    }
+  }
+}
diff --git a/tools/yang/ietf-yang-smiv2.yang b/tools/yang/ietf-yang-smiv2.yang
new file mode 100644
index 00000000..b06afc7a
--- /dev/null
+++ b/tools/yang/ietf-yang-smiv2.yang
@@ -0,0 +1,144 @@
+module ietf-yang-smiv2 {
+
+  namespace "urn:ietf:params:xml:ns:yang:ietf-yang-smiv2";
+  prefix "smiv2";
+  
+  organization
+   "IETF NETMOD (NETCONF Data Modeling Language) Working Group";
+  
+  contact
+   "WG Web:   <http://tools.ietf.org/wg/netmod/>
+    WG List:  <mailto:netmod@ietf.org>
+
+    WG Chair: David Kessens
+              <mailto:david.kessens@nsn.com>
+
+    WG Chair: Juergen Schoenwaelder
+              <mailto:j.schoenwaelder@jacobs-university.de>
+
+    Editor:   Juergen Schoenwaelder
+              <mailto:j.schoenwaelder@jacobs-university.de>";
+
+  description
+   "This module defines YANG extensions that are used to translate
+    SMIv2 concepts into YANG.
+
+    Copyright (c) 2011 IETF Trust and the persons identified as
+    authors of the code.  All rights reserved.
+
+    Redistribution and use in source and binary forms, with or
+    without modification, is permitted pursuant to, and subject
+    to the license terms contained in, the Simplified BSD License
+    set forth in Section 4.c of the IETF Trust's Legal Provisions
+    Relating to IETF Documents
+    (http://trustee.ietf.org/license-info).
+
+    This version of this YANG module is part of RFC XXXX; see 
+    the RFC itself for full legal notices.";
+    // RFC Ed.: replace XXXX with actual RFC number and remove this note
+
+  // RFC Ed.: please update the date to the date of publication
+  revision 2011-11-25 {
+    description
+     "Initial revision.";
+    reference
+     "RFC XXXX: Translation of SMIv2 MIB Modules to YANG Modules";
+    // RFC Ed.: replace XXXX with actual RFC number and remove this note
+  }
+
+  identity object-identity {
+    description
+     "Base identity for all SMIv2 OBJECT-IDENTITYs.";
+  }
+
+  typedef opaque {
+    type binary;
+    description
+     "The Opaque type supports the capability to pass arbitrary ASN.1
+      syntax.  A value is encoded using the ASN.1 Basic Encoding Rules
+      into a string of octets.  This, in turn, is encoded as an OCTET
+      STRING, in effect 'double-wrapping' the original ASN.1 value.
+
+      In the value set and its semantics, this type is equivalent to
+      the Opaque type of the SMIv2. This type exists in the SMIv2
+      solely for backward-compatibility reasons and this is also 
+      true for this YANG data type.";
+    reference
+     "RFC 2578: Structure of Management Information Version 2 (SMIv2)";
+  }
+
+  extension display-hint {
+    argument "format";
+    description
+     "The display-hint statement takes as an argument the DISPLAY-HINT
+      assigned to an SMIv2 textual convention.";
+    reference
+     "RFC2579: Textual Conventions for SMIv2";
+  }
+
+  extension max-access {
+    argument "access";
+    description
+     "The max-access statement takes as an argument the MAX-ACCESS
+      assigned to an SMIv2 object definition";
+    reference
+     "RFC2578: Structure of Management Information Version 2 (SMIv2)";
+  }
+
+  extension defval {
+    argument "value";
+    description
+     "The defval statement takes as an argument a default value
+      defined by an SMIv2 DEFVAL clause. Note that the value is in 
+      the SMIv2 value space defined by the SMIv2 syntax of the
+      corresponding object and not in the YANG value space
+      defined by the corresponding YANG data type.";
+    reference
+     "RFC2578: Structure of Management Information Version 2 (SMIv2)";
+  }
+
+  extension implied {
+    argument "index";
+    description
+     "If an SMIv2 INDEX object is preceded by the IMPLIED keyword, then
+      the implied statement is present in the yang module and takes as
+      an argument the name of the IMPLIED index object.";
+    reference
+     "RFC2578: Structure of Management Information Version 2 (SMIv2)";
+   }
+
+  extension alias {
+    argument "descriptor";
+    description
+     "The alias statement introduces an SMIv2 descriptor. The body of
+      the alias statement is expected to contain an oid statement that
+      provides the numeric OID associated with the descriptor.";
+    reference
+     "RFC2578: Structure of Management Information Version 2 (SMIv2)";
+  }
+
+  extension oid {
+    argument "value";
+    description
+     "The oid statement takes as an argument the object identifier
+      assigned to an SMIv2 definition. The object identifier value
+      is written in decimal dotted notation.";
+    reference
+     "RFC2578: Structure of Management Information Version 2 (SMIv2)";
+  }
+
+  extension subid {
+    argument "value";
+    description
+     "The subid statement takes as an argument the last sub-identifier
+      of the object identifier assigned to an SMIv2 definition.  The
+      sub-identifier value is a single positive decimal natural number.
+      The subid statement may not be used as a substatement to any
+      top-level node in a YANG document.  The subid substatement may
+      be used only as a substatement to a node having a parent node
+      defined with either a smiv2:oid or smiv2:subid substatement.";
+    reference
+     "RFC2578: Structure of Management Information Version 2 (SMIv2)";
+  }
+
+}
diff --git a/tools/yang/ietf-yang-types.yang b/tools/yang/ietf-yang-types.yang
new file mode 100644
index 00000000..ee58fa3a
--- /dev/null
+++ b/tools/yang/ietf-yang-types.yang
@@ -0,0 +1,474 @@
+module ietf-yang-types {
+
+  namespace "urn:ietf:params:xml:ns:yang:ietf-yang-types";
+  prefix "yang";
+
+  organization
+   "IETF NETMOD (NETCONF Data Modeling Language) Working Group";
+
+  contact
+   "WG Web:   <http://tools.ietf.org/wg/netmod/>
+    WG List:  <mailto:netmod@ietf.org>
+
+    WG Chair: David Kessens
+              <mailto:david.kessens@nsn.com>
+
+    WG Chair: Juergen Schoenwaelder
+              <mailto:j.schoenwaelder@jacobs-university.de>
+
+    Editor:   Juergen Schoenwaelder
+              <mailto:j.schoenwaelder@jacobs-university.de>";
+
+  description
+   "This module contains a collection of generally useful derived
+    YANG data types.
+
+    Copyright (c) 2013 IETF Trust and the persons identified as
+    authors of the code.  All rights reserved.
+
+    Redistribution and use in source and binary forms, with or
+    without modification, is permitted pursuant to, and subject
+    to the license terms contained in, the Simplified BSD License
+    set forth in Section 4.c of the IETF Trust's Legal Provisions
+    Relating to IETF Documents
+    (http://trustee.ietf.org/license-info).
+
+    This version of this YANG module is part of RFC 6991; see
+    the RFC itself for full legal notices.";
+
+  revision 2013-07-15 {
+    description
+     "This revision adds the following new data types:
+      - yang-identifier
+      - hex-string
+      - uuid
+      - dotted-quad";
+    reference
+     "RFC 6991: Common YANG Data Types";
+  }
+
+  revision 2010-09-24 {
+    description
+     "Initial revision.";
+    reference
+     "RFC 6021: Common YANG Data Types";
+  }
+
+  /*** collection of counter and gauge types ***/
+
+  typedef counter32 {
+    type uint32;
+    description
+     "The counter32 type represents a non-negative integer
+      that monotonically increases until it reaches a
+      maximum value of 2^32-1 (4294967295 decimal), when it
+      wraps around and starts increasing again from zero.
+
+      Counters have no defined 'initial' value, and thus, a
+      single value of a counter has (in general) no information
+      content.  Discontinuities in the monotonically increasing
+      value normally occur at re-initialization of the
+      management system, and at other times as specified in the
+      description of a schema node using this type.  If such
+      other times can occur, for example, the creation of
+      a schema node of type counter32 at times other than
+      re-initialization, then a corresponding schema node
+      should be defined, with an appropriate type, to indicate
+      the last discontinuity.
+
+      The counter32 type should not be used for configuration
+      schema nodes.  A default statement SHOULD NOT be used in
+      combination with the type counter32.
+
+      In the value set and its semantics, this type is equivalent
+      to the Counter32 type of the SMIv2.";
+    reference
+     "RFC 2578: Structure of Management Information Version 2
+                (SMIv2)";
+  }
+
+  typedef zero-based-counter32 {
+    type yang:counter32;
+    default "0";
+    description
+     "The zero-based-counter32 type represents a counter32
+      that has the defined 'initial' value zero.
+
+      A schema node of this type will be set to zero (0) on creation
+      and will thereafter increase monotonically until it reaches
+      a maximum value of 2^32-1 (4294967295 decimal), when it
+      wraps around and starts increasing again from zero.
+
+      Provided that an application discovers a new schema node
+      of this type within the minimum time to wrap, it can use the
+      'initial' value as a delta.  It is important for a management
+      station to be aware of this minimum time and the actual time
+      between polls, and to discard data if the actual time is too
+      long or there is no defined minimum time.
+
+      In the value set and its semantics, this type is equivalent
+      to the ZeroBasedCounter32 textual convention of the SMIv2.";
+    reference
+      "RFC 4502: Remote Network Monitoring Management Information
+                 Base Version 2";
+  }
+
+  typedef counter64 {
+    type uint64;
+    description
+     "The counter64 type represents a non-negative integer
+      that monotonically increases until it reaches a
+      maximum value of 2^64-1 (18446744073709551615 decimal),
+      when it wraps around and starts increasing again from zero.
+
+      Counters have no defined 'initial' value, and thus, a
+      single value of a counter has (in general) no information
+      content.  Discontinuities in the monotonically increasing
+      value normally occur at re-initialization of the
+      management system, and at other times as specified in the
+      description of a schema node using this type.  If such
+      other times can occur, for example, the creation of
+      a schema node of type counter64 at times other than
+      re-initialization, then a corresponding schema node
+      should be defined, with an appropriate type, to indicate
+      the last discontinuity.
+
+      The counter64 type should not be used for configuration
+      schema nodes.  A default statement SHOULD NOT be used in
+      combination with the type counter64.
+
+      In the value set and its semantics, this type is equivalent
+      to the Counter64 type of the SMIv2.";
+    reference
+     "RFC 2578: Structure of Management Information Version 2
+                (SMIv2)";
+  }
+
+  typedef zero-based-counter64 {
+    type yang:counter64;
+    default "0";
+    description
+     "The zero-based-counter64 type represents a counter64 that
+      has the defined 'initial' value zero.
+
+      A schema node of this type will be set to zero (0) on creation
+      and will thereafter increase monotonically until it reaches
+      a maximum value of 2^64-1 (18446744073709551615 decimal),
+      when it wraps around and starts increasing again from zero.
+
+      Provided that an application discovers a new schema node
+      of this type within the minimum time to wrap, it can use the
+      'initial' value as a delta.  It is important for a management
+      station to be aware of this minimum time and the actual time
+      between polls, and to discard data if the actual time is too
+      long or there is no defined minimum time.
+
+      In the value set and its semantics, this type is equivalent
+      to the ZeroBasedCounter64 textual convention of the SMIv2.";
+    reference
+     "RFC 2856: Textual Conventions for Additional High Capacity
+                Data Types";
+  }
+
+  typedef gauge32 {
+    type uint32;
+    description
+     "The gauge32 type represents a non-negative integer, which
+      may increase or decrease, but shall never exceed a maximum
+      value, nor fall below a minimum value.  The maximum value
+      cannot be greater than 2^32-1 (4294967295 decimal), and
+      the minimum value cannot be smaller than 0.  The value of
+      a gauge32 has its maximum value whenever the information
+      being modeled is greater than or equal to its maximum
+      value, and has its minimum value whenever the information
+      being modeled is smaller than or equal to its minimum value.
+      If the information being modeled subsequently decreases
+      below (increases above) the maximum (minimum) value, the
+      gauge32 also decreases (increases).
+
+      In the value set and its semantics, this type is equivalent
+      to the Gauge32 type of the SMIv2.";
+    reference
+     "RFC 2578: Structure of Management Information Version 2
+                (SMIv2)";
+  }
+
+  typedef gauge64 {
+    type uint64;
+    description
+     "The gauge64 type represents a non-negative integer, which
+      may increase or decrease, but shall never exceed a maximum
+      value, nor fall below a minimum value.  The maximum value
+      cannot be greater than 2^64-1 (18446744073709551615), and
+      the minimum value cannot be smaller than 0.  The value of
+      a gauge64 has its maximum value whenever the information
+      being modeled is greater than or equal to its maximum
+      value, and has its minimum value whenever the information
+      being modeled is smaller than or equal to its minimum value.
+      If the information being modeled subsequently decreases
+      below (increases above) the maximum (minimum) value, the
+      gauge64 also decreases (increases).
+
+      In the value set and its semantics, this type is equivalent
+      to the CounterBasedGauge64 SMIv2 textual convention defined
+      in RFC 2856";
+    reference
+     "RFC 2856: Textual Conventions for Additional High Capacity
+                Data Types";
+  }
+
+  /*** collection of identifier-related types ***/
+
+  typedef object-identifier {
+    type string {
+      pattern '(([0-1](\.[1-3]?[0-9]))|(2\.(0|([1-9]\d*))))'
+            + '(\.(0|([1-9]\d*)))*';
+    }
+    description
+     "The object-identifier type represents administratively
+      assigned names in a registration-hierarchical-name tree.
+
+      Values of this type are denoted as a sequence of numerical
+      non-negative sub-identifier values.  Each sub-identifier
+      value MUST NOT exceed 2^32-1 (4294967295).  Sub-identifiers
+      are separated by single dots and without any intermediate
+      whitespace.
+
+      The ASN.1 standard restricts the value space of the first
+      sub-identifier to 0, 1, or 2.  Furthermore, the value space
+      of the second sub-identifier is restricted to the range
+      0 to 39 if the first sub-identifier is 0 or 1.  Finally,
+      the ASN.1 standard requires that an object identifier
+      has always at least two sub-identifiers.  The pattern
+      captures these restrictions.
+
+      Although the number of sub-identifiers is not limited,
+      module designers should realize that there may be
+      implementations that stick with the SMIv2 limit of 128
+      sub-identifiers.
+
+      This type is a superset of the SMIv2 OBJECT IDENTIFIER type
+      since it is not restricted to 128 sub-identifiers.  Hence,
+      this type SHOULD NOT be used to represent the SMIv2 OBJECT
+      IDENTIFIER type; the object-identifier-128 type SHOULD be
+      used instead.";
+    reference
+     "ISO9834-1: Information technology -- Open Systems
+      Interconnection -- Procedures for the operation of OSI
+      Registration Authorities: General procedures and top
+      arcs of the ASN.1 Object Identifier tree";
+  }
+
+  typedef object-identifier-128 {
+    type object-identifier {
+      pattern '\d*(\.\d*){1,127}';
+    }
+    description
+     "This type represents object-identifiers restricted to 128
+      sub-identifiers.
+
+      In the value set and its semantics, this type is equivalent
+      to the OBJECT IDENTIFIER type of the SMIv2.";
+    reference
+     "RFC 2578: Structure of Management Information Version 2
+                (SMIv2)";
+  }
+
+  typedef yang-identifier {
+    type string {
+      length "1..max";
+      pattern '[a-zA-Z_][a-zA-Z0-9\-_.]*';
+      pattern '.|..|[^xX].*|.[^mM].*|..[^lL].*';
+    }
+    description
+      "A YANG identifier string as defined by the 'identifier'
+       rule in Section 12 of RFC 6020.  An identifier must
+       start with an alphabetic character or an underscore
+       followed by an arbitrary sequence of alphabetic or
+       numeric characters, underscores, hyphens, or dots.
+
+       A YANG identifier MUST NOT start with any possible
+       combination of the lowercase or uppercase character
+       sequence 'xml'.";
+    reference
+      "RFC 6020: YANG - A Data Modeling Language for the Network
+                 Configuration Protocol (NETCONF)";
+  }
+
+  /*** collection of types related to date and time***/
+
+  typedef date-and-time {
+    type string {
+      pattern '\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}(\.\d+)?'
+            + '(Z|[\+\-]\d{2}:\d{2})';
+    }
+    description
+     "The date-and-time type is a profile of the ISO 8601
+      standard for representation of dates and times using the
+      Gregorian calendar.  The profile is defined by the
+      date-time production in Section 5.6 of RFC 3339.
+
+      The date-and-time type is compatible with the dateTime XML
+      schema type with the following notable exceptions:
+
+      (a) The date-and-time type does not allow negative years.
+
+      (b) The date-and-time time-offset -00:00 indicates an unknown
+          time zone (see RFC 3339) while -00:00 and +00:00 and Z
+          all represent the same time zone in dateTime.
+
+      (c) The canonical format (see below) of data-and-time values
+          differs from the canonical format used by the dateTime XML
+          schema type, which requires all times to be in UTC using
+          the time-offset 'Z'.
+
+      This type is not equivalent to the DateAndTime textual
+      convention of the SMIv2 since RFC 3339 uses a different
+      separator between full-date and full-time and provides
+      higher resolution of time-secfrac.
+
+      The canonical format for date-and-time values with a known time
+      zone uses a numeric time zone offset that is calculated using
+      the device's configured known offset to UTC time.  A change of
+      the device's offset to UTC time will cause date-and-time values
+      to change accordingly.  Such changes might happen periodically
+      in case a server follows automatically daylight saving time
+      (DST) time zone offset changes.  The canonical format for
+      date-and-time values with an unknown time zone (usually
+      referring to the notion of local time) uses the time-offset
+      -00:00.";
+    reference
+     "RFC 3339: Date and Time on the Internet: Timestamps
+      RFC 2579: Textual Conventions for SMIv2
+      XSD-TYPES: XML Schema Part 2: Datatypes Second Edition";
+  }
+
+  typedef timeticks {
+    type uint32;
+    description
+     "The timeticks type represents a non-negative integer that
+      represents the time, modulo 2^32 (4294967296 decimal), in
+      hundredths of a second between two epochs.  When a schema
+      node is defined that uses this type, the description of
+      the schema node identifies both of the reference epochs.
+
+      In the value set and its semantics, this type is equivalent
+      to the TimeTicks type of the SMIv2.";
+    reference
+     "RFC 2578: Structure of Management Information Version 2
+                (SMIv2)";
+  }
+
+  typedef timestamp {
+    type yang:timeticks;
+    description
+     "The timestamp type represents the value of an associated
+      timeticks schema node at which a specific occurrence
+      happened.  The specific occurrence must be defined in the
+      description of any schema node defined using this type.  When
+      the specific occurrence occurred prior to the last time the
+      associated timeticks attribute was zero, then the timestamp
+      value is zero.  Note that this requires all timestamp values
+      to be reset to zero when the value of the associated timeticks
+      attribute reaches 497+ days and wraps around to zero.
+
+      The associated timeticks schema node must be specified
+      in the description of any schema node using this type.
+
+      In the value set and its semantics, this type is equivalent
+      to the TimeStamp textual convention of the SMIv2.";
+    reference
+     "RFC 2579: Textual Conventions for SMIv2";
+  }
+
+  /*** collection of generic address types ***/
+
+  typedef phys-address {
+    type string {
+      pattern '([0-9a-fA-F]{2}(:[0-9a-fA-F]{2})*)?';
+    }
+
+    description
+     "Represents media- or physical-level addresses represented
+      as a sequence octets, each octet represented by two hexadecimal
+      numbers.  Octets are separated by colons.  The canonical
+      representation uses lowercase characters.
+
+      In the value set and its semantics, this type is equivalent
+      to the PhysAddress textual convention of the SMIv2.";
+    reference
+     "RFC 2579: Textual Conventions for SMIv2";
+  }
+
+  typedef mac-address {
+    type string {
+      pattern '[0-9a-fA-F]{2}(:[0-9a-fA-F]{2}){5}';
+    }
+    description
+     "The mac-address type represents an IEEE 802 MAC address.
+      The canonical representation uses lowercase characters.
+
+      In the value set and its semantics, this type is equivalent
+      to the MacAddress textual convention of the SMIv2.";
+    reference
+     "IEEE 802: IEEE Standard for Local and Metropolitan Area
+                Networks: Overview and Architecture
+      RFC 2579: Textual Conventions for SMIv2";
+  }
+
+  /*** collection of XML-specific types ***/
+
+  typedef xpath1.0 {
+    type string;
+    description
+     "This type represents an XPATH 1.0 expression.
+
+      When a schema node is defined that uses this type, the
+      description of the schema node MUST specify the XPath
+      context in which the XPath expression is evaluated.";
+    reference
+     "XPATH: XML Path Language (XPath) Version 1.0";
+  }
+
+  /*** collection of string types ***/
+
+  typedef hex-string {
+    type string {
+      pattern '([0-9a-fA-F]{2}(:[0-9a-fA-F]{2})*)?';
+    }
+    description
+     "A hexadecimal string with octets represented as hex digits
+      separated by colons.  The canonical representation uses
+      lowercase characters.";
+  }
+
+  typedef uuid {
+    type string {
+      pattern '[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-'
+            + '[0-9a-fA-F]{4}-[0-9a-fA-F]{12}';
+    }
+    description
+     "A Universally Unique IDentifier in the string representation
+      defined in RFC 4122.  The canonical representation uses
+      lowercase characters.
+
+      The following is an example of a UUID in string representation:
+      f81d4fae-7dec-11d0-a765-00a0c91e6bf6
+      ";
+    reference
+     "RFC 4122: A Universally Unique IDentifier (UUID) URN
+                Namespace";
+  }
+
+  typedef dotted-quad {
+    type string {
+      pattern
+        '(([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\.){3}'
+      + '([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])';
+    }
+    description
+      "An unsigned 32-bit number expressed in the dotted-quad
+       notation, i.e., four octets written as decimal numbers
+       and separated with the '.' (full stop) character.";
+  }
+}