diff --git a/utils/yangutils/src/test/java/org/onosproject/yangutils/ietfyang/IetfYangFileTest.java b/utils/yangutils/src/test/java/org/onosproject/yangutils/ietfyang/IetfYangFileTest.java
new file mode 100644
index 0000000..0f0a514
--- /dev/null
+++ b/utils/yangutils/src/test/java/org/onosproject/yangutils/ietfyang/IetfYangFileTest.java
@@ -0,0 +1,63 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * 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.
+ */
+
+package org.onosproject.yangutils.ietfyang;
+
+import org.apache.maven.plugin.MojoExecutionException;
+import org.junit.Test;
+import org.onosproject.yangutils.linker.impl.YangLinkerManager;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+import org.onosproject.yangutils.plugin.manager.YangUtilManager;
+import org.onosproject.yangutils.translator.tojava.utils.YangPluginConfig;
+import org.onosproject.yangutils.utils.io.impl.YangFileScanner;
+
+import java.io.IOException;
+
+import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.deleteDirectory;
+
+/**
+ * Test cases for testing IETF YANG files.
+ */
+public class IetfYangFileTest {
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+    private final YangUtilManager utilManager = new YangUtilManager();
+    private final YangLinkerManager yangLinkerManager = new YangLinkerManager();
+
+    /**
+     * Checks hierarchical intra with inter file type linking.
+     * Reference: https://datatracker.ietf.org/doc/draft-zha-l3sm-l3vpn-onos-deployment
+     */
+    @Test
+    public void l3vpnserviceyang()
+            throws IOException, ParserException, MojoExecutionException {
+
+        String searchDir = "src/test/resources/ietfyang/l3vpnservice";
+        utilManager.createYangFileInfoSet(YangFileScanner.getYangFiles(searchDir));
+        utilManager.parseYangFileInfoSet();
+        utilManager.resolveDependenciesUsingLinker();
+
+        String userDir = System.getProperty("user.dir");
+        YangPluginConfig yangPluginConfig = new YangPluginConfig();
+        yangPluginConfig.setCodeGenDir("target/ietfyang/l3vpnservice/");
+
+        utilManager.translateToJava(utilManager.getYangFileInfoSet(), yangPluginConfig);
+
+        deleteDirectory(userDir + "/target/ietfyang/");
+    }
+
+}
diff --git a/utils/yangutils/src/test/resources/ietfyang/l3vpnservice/ietf-inet-types.yang b/utils/yangutils/src/test/resources/ietfyang/l3vpnservice/ietf-inet-types.yang
new file mode 100644
index 0000000..851a4d7
--- /dev/null
+++ b/utils/yangutils/src/test/resources/ietfyang/l3vpnservice/ietf-inet-types.yang
@@ -0,0 +1,454 @@
+  module ietf-inet-types {
+
+    yang-version 1;
+
+    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";
+
+    }
+
+
+    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";
+
+    }
+
+    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";
+
+    }
+
+    typedef ip-address {
+      type union {
+        type ipv4-address;
+        type 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 ipv4-address-no-zone;
+        type 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 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 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 ipv4-prefix;
+        type 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";
+
+    }
+
+    typedef domain-name {
+      type string {
+        length "1..253";
+        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]\.?)|\.';
+      }
+      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 ip-address;
+        type 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)";
+
+    }
+  }  // module ietf-inet-types
diff --git a/utils/yangutils/src/test/resources/ietfyang/l3vpnservice/ietf-sd-onos-common-types.yang b/utils/yangutils/src/test/resources/ietfyang/l3vpnservice/ietf-sd-onos-common-types.yang
new file mode 100644
index 0000000..7cde2ec
--- /dev/null
+++ b/utils/yangutils/src/test/resources/ietfyang/l3vpnservice/ietf-sd-onos-common-types.yang
@@ -0,0 +1,141 @@
+   module ietf-sd-onos-common-types {
+     namespace "urn:ietf:params:xml:ns:yang:ietf-sd-onos-common-types";
+     prefix types ;
+     /*
+     import ietf-inet-types{
+        prefix inet;
+        }
+     import ietf-yang-types {
+       prefix yang-types;
+       }
+     */
+     organization "";
+     contact "";
+
+     description
+       "Defines common basic types of L3VPN.";
+
+     revision "2015-12-16" {
+       reference "";
+     }
+
+     typedef admin-status {
+       type enumeration {
+         enum admin-up {
+           value 0 ;
+           description "admin up, the operate-status is depend on the real
+   running status ." ;
+         }
+         enum admin-down {
+           value 1 ;
+           description "admin down,the operate-status is forced to down no
+   matter what the real status is" ;
+         }
+         enum config-up {
+           value 2 ;
+           description "the operate-status is forced to up no matter what
+   the real status is." ;
+         }
+       }
+       default admin-up;
+       description
+         "The administration status of the service.";
+     }
+
+     typedef notification-status {
+       type enumeration {
+         enum up {
+           value 0 ;
+           description "up." ;
+         }
+         enum down {
+           value 1 ;
+           description "down." ;
+         }
+       }
+       default up;
+       description
+         "The notification status of the service.";
+     }
+
+     typedef notification-type {
+       type enumeration {
+         enum ne{
+           value 0 ;
+           description "ncd change." ;
+         }
+         enum link{
+           value 1 ;
+           description "link change." ;
+         }
+         enum ltp{
+           value 2 ;
+           description "ltp change." ;
+         }
+       }
+       default ltp;
+       description
+         "The notification-type of the service.";
+     }
+
+     typedef operate-status {
+       type enumeration {
+         enum operate-up {
+           value 0 ;
+           description "operate up." ;
+         }
+         enum operate-down {
+           value 1 ;
+           description "operate down." ;
+         }
+       }
+       default operate-up;
+       description
+         "The operation status of the service.";
+     }
+
+      grouping command-result {
+         description
+           "Reusable container of the result of the command.";
+        container command-result {
+           description
+             "The result of the command.";
+          leaf result {
+             type int8;
+             description
+               "1 : success, 2 : failed, 3 : partly failed" ;
+         }
+         container success-resources {
+           description
+             "The resources those are available." ;
+           list success-resource-list {
+             description
+               "The resource list shows those are available." ;
+             leaf resource-id {
+               type string;
+               description
+                 "The available resource id." ;
+             }
+           }
+         }
+         container failed-resources {
+           description
+             "The resources those are failed." ;
+           list failed-resource-list {
+             description
+               "The resources list shows those are failed." ;
+             leaf resource-id {
+               type string;
+               description
+                 "The failed resources ids." ;
+             }
+             leaf error-code {
+               type string;
+               description
+                 "The error code." ;
+             }
+           }
+         }
+       }
+     }
+   }
diff --git a/utils/yangutils/src/test/resources/ietfyang/l3vpnservice/ietf-sd-onos-service-l3vpn.yang b/utils/yangutils/src/test/resources/ietfyang/l3vpnservice/ietf-sd-onos-service-l3vpn.yang
new file mode 100644
index 0000000..7b55f71
--- /dev/null
+++ b/utils/yangutils/src/test/resources/ietfyang/l3vpnservice/ietf-sd-onos-service-l3vpn.yang
@@ -0,0 +1,316 @@
+   module ietf-sd-onos-service-l3vpn {
+     namespace "urn:ietf:params:xml:ns:yang:ietf-sd-onos-service-l3vpn";
+     prefix l3vpn ;
+     /*
+     import ietf-inet-types{
+       prefix inet;
+     }
+     import ietf-yang-types {
+       prefix yang-types;
+     }
+     */
+     import ietf-sd-onos-service-types {
+       prefix service-types;
+     }
+     import ietf-sd-onos-common-types {
+       prefix types;
+     }
+     organization "";
+     contact "";
+
+     description
+       "L3vpn configuration model in ONOS.";
+
+     revision "2015-12-16" {
+       reference "";
+     }
+
+      grouping l3vpn {
+       description
+         "The configuration module of l3 vpn.";
+       leaf name {
+         type string ;
+         mandatory true;
+         description "name of snc eline." ;
+       }
+       leaf id {
+         type uint32 ;
+         mandatory true;
+         description "ID of snc eline." ;
+       }
+       leaf user-label {
+         type string ;
+         description "user label of snc eline." ;
+       }
+       leaf parent-ncd-id {
+         type string ;
+         description "parent ncd id." ;
+       }
+
+       leaf admin-status {
+         type types:admin-status;
+         description "administration status." ;
+       }
+       leaf operate-status {
+         type types:operate-status;
+         description "operation status." ;
+       }
+
+       uses service-type-grouping;
+       container acess-information {
+              description "access information of the l3 vpn." ;
+
+           uses service-types:l3-ac;        }
+
+       container protect-policy{
+         description "L3VPN Service protect policy." ;
+         uses service-types:protect-policy;
+       }
+       container tunnel-service {
+         description "tunnel service." ;
+         uses service-types:tunnel-service;
+       }
+
+     }
+
+     grouping service-type-grouping {
+       description "Basic service type" ;
+       leaf service-topology {
+         type enumeration {
+           enum full-mesh {
+             value 1 ;
+             description "full-mesh." ;
+           }
+           enum hub-spoke {
+             value 2 ;
+             description "hub-spoke." ;
+           }
+         }
+         default full-mesh;
+         description "service topology type." ;
+       }
+     }
+
+     container service {
+       description
+         "Root level of L3vpn service module.";
+       container l3vpn-cfg {
+         description
+           "L3vpn configuration model in ONOS.";
+         list vpn-cfg {
+           key name;
+           description
+             "vpn configuration parameter list.";
+           uses l3vpn;
+         }
+       }
+       container service-paths {
+         description
+           "The service path of the l3 vpn.";
+       }
+     }
+
+
+
+     rpc create-l3vpn-instance {
+       description "Create l3vpn instance." ;
+       input {
+         container l3vpn-instance {
+           description "Create l3vpn instance." ;
+           uses l3vpn;
+         }
+       }
+     }
+
+     rpc delete-l3vpn-instance {
+       description "Delete l3vpn instance." ;
+       input {
+         leaf l3vpn-id {
+           type string;
+           description "vpn id." ;
+         }
+       }
+     }
+
+     rpc close-l3vpn {
+     description "Close l3vpn." ;
+         input {
+             leaf l3vpn-id {
+                 type string;
+           description "vpn id." ;
+             }
+             container ac-status {
+           description "Access status of the vpn." ;
+                 list acs{
+                     key "id";
+             description "Access information." ;
+                     leaf id {
+                         type string;
+               description "Access id." ;
+                     }
+                     leaf admin-status {
+                         type types:admin-status;
+               description "Administration status." ;
+                     }
+                 }
+             }
+         }
+     }
+
+     rpc modify-l3vpn-instance-basic {
+       description "Modify l3vpn instance basic information." ;
+       input {
+         leaf l3vpn-id {
+           type string;
+           description "vpn id." ;
+         }
+         leaf user-label {
+           type string ;
+           description "user label." ;
+         }
+       }
+     }
+
+     rpc modify-l3vpn-instance-ac-qos {
+       description "Modify l3vpn instance ac qos information." ;
+       input {
+         leaf l3vpn-id {
+           type string;
+           description "L3vpn ID." ;
+         }
+         container ac-qos {
+           description "ac qos information." ;
+           list acs{
+           key "id";
+           description "acs list." ;
+                 leaf id {
+                   type string;
+                   description "acs ID." ;
+               }
+               container qos-policy {
+             description "qos policy." ;
+                   container qos-if-cars {
+               description "cars qos policy." ;
+                          uses service-types:qos-if-car;
+
+                   }
+               }
+           }
+         }
+       }
+     }
+     rpc modify-l3vpn-instance-connection {
+       description "Modify a l3vpn connection." ;
+       input {
+         leaf l3vpn-id {
+           type string;
+           description "L3vpn ID." ;
+         }
+         container ac-connection {
+           description "ac connection." ;
+           list acs{
+             key "id";
+             description "acs ID." ;
+             leaf id {
+               type string ;
+               description "acs ID." ;
+             }
+             container connection {
+               description "CE to PE  connection." ;
+               uses service-types:connection;
+             }
+           }
+         }
+       }
+     }
+     rpc inquire-l3vpn-instance-work-path {
+       description "Inquire a L3VPN instance work path." ;
+        input {
+              leaf service-id {
+                type string;
+             description "service ID." ;
+              }
+               leaf ingress-ne-id {
+                 type string ;
+              description "ingress network element ID." ;
+               }
+               leaf destination-ne-id {
+                 type string ;
+              description "destination network element ID." ;
+               }
+               leaf ingress-ac-id {
+                 type string ;
+              description "ingress ac ID." ;
+               }
+               leaf destination-ac-id {
+                 type string ;
+              description "destination ac ID." ;
+               }
+               leaf path-layer {
+                  type string ;
+               description "path layer." ;
+               }
+               leaf path-role {
+                  type string ;
+             description "path role." ;
+               }
+       }
+       output {
+           container service-path {
+            description "service path." ;
+              leaf service-id {
+                type string;
+             description "service ID." ;
+              }
+               leaf ingress-ne-id {
+                 type string ;
+              description "ingress network element ID." ;
+               }
+               leaf destination-ne-id {
+                 type string ;
+               description "destination network element ID." ;
+               }
+               leaf ingress-ac-id {
+                 type string ;
+              description "ingress access circuit ID." ;
+               }
+               leaf destination-ac-id {
+                 type string ;
+              description "destination access circuit ID." ;
+               }
+               leaf path-layer {
+                  type string ;
+               description "path layer." ;
+               }
+               leaf path-role {
+                  type string ;
+               description "path role." ;
+               }
+               list path-list {
+                   key "ne-id";
+             description "path list." ;
+                   leaf ne-id {
+                      type string;
+              description "network element ID." ;
+                   }
+                   leaf ingress-ltp-id {
+                      type string;
+              description "LTP ID." ;
+                   }
+                   leaf backward-peer-id {
+                      type string;
+              description "backward peer ID." ;
+                   }
+                   leaf egress-ltp-id {
+                      type string;
+              description "egress ltp ID." ;
+                   }
+                   leaf forward-peer-id {
+                      type string;
+              description "forward peer ID." ;
+                   }
+               }
+             }
+       }
+     }
+   }
diff --git a/utils/yangutils/src/test/resources/ietfyang/l3vpnservice/ietf-sd-onos-service-types.yang b/utils/yangutils/src/test/resources/ietfyang/l3vpnservice/ietf-sd-onos-service-types.yang
new file mode 100644
index 0000000..7fd7700
--- /dev/null
+++ b/utils/yangutils/src/test/resources/ietfyang/l3vpnservice/ietf-sd-onos-service-types.yang
@@ -0,0 +1,816 @@
+   module ietf-sd-onos-service-types {
+       namespace "urn:ietf:params:xml:ns:yang:ietf-sd-onos-service-types";
+       prefix service-types ;
+
+       import ietf-inet-types {prefix inet; }
+       import ietf-sd-onos-common-types {prefix  types;}
+
+     organization "";
+     contact "";
+
+     description
+       "Defines basic service types for L3VPN service.";
+
+     revision "2015-12-16" {
+       reference "";
+     }
+
+       typedef exp {
+           type enumeration {
+               enum BE {
+                   value 0 ;
+                   description "BE." ;
+               }
+               enum AF1 {
+                   value 1 ;
+                   description "AF1." ;
+               }
+               enum AF2 {
+                   value 2 ;
+                   description "AF2." ;
+               }
+               enum AF3 {
+                   value 3 ;
+                   description "AF3." ;
+               }
+               enum AF4 {
+                   value 4 ;
+                   description "AF4." ;
+               }
+               enum EF {
+                   value 5 ;
+                   description "EF." ;
+               }
+               enum CS6 {
+                   value 6 ;
+                   description "CS6." ;
+               }
+               enum CS7 {
+                   value 7 ;
+                   description "CS7." ;
+               }
+           }
+           default CS7;
+           description
+             "exp parameter.";
+       }
+
+       typedef pw-role{
+           type enumeration {
+               enum normal{
+                   value 0 ;
+                   description "normal." ;
+               }
+               enum master {
+                   value 1 ;
+                   description "master." ;
+               }
+               enum slave {
+                   value 2 ;
+                   description "slave." ;
+               }
+               enum DNI-PW {
+                   value 3 ;
+                   description "DNI PW." ;
+               }
+           }
+           default normal;
+           description
+             "The role of the PW.";
+       }
+
+       grouping qos-if-car {
+           description "qos parameter." ;
+         list qos-if-car {
+       key "direction";
+           description "cars qos policy." ;
+           leaf direction {
+               type enumeration {
+                   enum inbound{
+                       value 0 ;
+                       description "inbound." ;
+                   }
+                   enum outbound {
+                       value 1 ;
+                       description "outbound." ;
+                   }
+               }
+        description "qos for interface car" ;
+           }
+
+           leaf cir {
+               type int32;
+          description "forward CIR. unit:Kbps" ;
+           }
+           leaf pir {
+               type int32;
+          description "forward PIR. unit:Kbps" ;
+           }
+           leaf cbs {
+               type int32;
+          description "forward CBS. unit:Kbps" ;
+           }
+           leaf pbs {
+               type int32;
+          description "forward PBS. unit:Kbps" ;
+           }
+        }
+       }
+
+       grouping protect-policy {
+           description "The protect policy of the VPN" ;
+           leaf protect-type {
+               type enumeration {
+                   enum unprotected {
+                       value 0 ;
+                       description "unprotected." ;
+                   }
+                   enum protected {
+                       value 1 ;
+                       description "protection." ;
+                   }
+               }
+               default unprotected ;
+          description "protection type" ;
+           }
+
+           leaf revertive-type {
+               type enumeration {
+                   enum no-revertive {
+                       value 0 ;
+                       description "unprotected." ;
+                   }
+                   enum revertive {
+                       value 1 ;
+                       description "protection." ;
+                   }
+               }
+          description "revertive mode" ;
+           }
+           leaf wtr {
+               type uint32;
+               default 300;
+          description "WTR.unit:s" ;
+           }
+       }
+       grouping oam-policy {
+         description "The oam policy of the vpn service." ;
+           leaf detect-type {
+               type enumeration {
+                   enum undetect {
+                       value 0 ;
+                       description "unprotected." ;
+                   }
+                   enum APS {
+                       value 1 ;
+                       description "protection." ;
+                   }
+                   enum BFD {
+                       value 2 ;
+                       description "unprotected." ;
+                   }
+               }
+          description "detect type" ;
+           }
+           container bfd-detect-para {
+          description "bfd detect parameters." ;
+               leaf ingress-discriminator {
+                   type int32;
+            description "ingress-discriminator" ;
+               }
+               leaf egress-discriminator {
+                   type int32;
+            description "egress-discriminator" ;
+               }
+               leaf tx-interval {
+                   type int32;
+            description "tx-interval" ;
+               }
+               leaf rx-interval {
+                   type int32;
+            description "rx-interval" ;
+               }
+               leaf detect-interval {
+                   type int32;
+            description "detect-interval" ;
+              }
+           }
+       }
+       grouping ac {
+        description "Access information." ;
+           leaf id{
+               type string;
+          mandatory true;
+          description "ac id." ;
+           }
+           leaf name{
+               type string;
+          config false;
+          description "ac name." ;
+           }
+
+           leaf ne-id {
+               type string ;
+            mandatory true;
+            description "ne id." ;
+           }
+
+           leaf ltp-id {
+               type string ;
+               mandatory true;
+               description "ltp id." ;
+           }
+           leaf admin-status {
+                                     type types:admin-status;
+               description "Administration status." ;
+           }
+           leaf operate-status {
+              type types:operate-status;
+              description "Operation status." ;
+           }
+           container l2-access {
+               description "link layer access information of ac." ;
+               uses l2-access;
+           }
+
+           leaf role {
+               type enumeration {
+                   enum master {
+                       value 0 ;
+                       description "master." ;
+                   }
+                   enum slave {
+                       value 1 ;
+                       description "slave." ;
+                   }
+                   enum hub {
+                       value 2 ;
+                       description "slave." ;
+                   }
+                   enum spoke {
+                       value 3 ;
+                       description "slave." ;
+                   }
+               }
+               default master;
+          description "role of snc lsp." ;
+           }
+           container qos-policy {
+          description "The qos policy of the vpn service." ;
+               container qos-if-cars {
+             description "qos policy if car." ;
+                   list qos-if-car {
+                     //key "direction";
+                     uses qos-if-car;
+             description "List of qos parameters." ;
+                   }
+               }
+           }
+       }
+       grouping l3-ac {
+        description "Access information of l3vpn." ;
+       list access-circuit {
+           key "id";
+           description "list of access circuit." ;
+           uses ac;
+           container connection {
+               description "connection information of ac." ;
+               uses connection;
+           }
+        }
+       }
+       grouping l2-access {
+        description "Access information of l2vpn." ;
+           leaf access-type{
+               type enumeration {
+                   enum Port {
+                       value 0 ;
+                       description "master." ;
+                   }
+                   enum Dot1Q {
+                       value 1 ;
+                       description "slave." ;
+                   }
+                   enum QinQ {
+                       value 2 ;
+                       description "master." ;
+                   }
+               }
+        mandatory true;
+        description "The access type of the vpn service." ;
+           }
+           leaf dot1q-vlan-bitmap {
+               type string;
+          mandatory true;
+               description "Dot1Q Vlan Bitmap." ;
+           }
+
+           leaf qinq-svlan-bitmap {
+               type string;
+          mandatory true;
+               description "QinQ svlan Bitmap." ;
+           }
+
+           leaf qinq-cvlan-bitmap {
+               type string;
+          mandatory true;
+               description "QinQ cvlan Bitmap." ;
+           }
+           leaf access-action {
+               type enumeration {
+                   enum Keep {
+                       value 0 ;
+                       description "keep." ;
+                   }
+                   enum Push {
+                       value 1 ;
+                       description "push." ;
+                   }
+                   enum Pop {
+                       value 2 ;
+                       description "pop." ;
+                   }
+                   enum Swap {
+                       value 3 ;
+                       description "swap." ;
+                   }
+               }
+          mandatory true;
+               description "access type." ;
+           }
+
+           leaf action-vlan-id {
+               type int32 {
+                   range "1..4094";
+               }
+          description "action vlan id." ;
+           }
+       }
+       grouping connection {
+           description "Describe the connection of the vpn service." ;
+           leaf ip-address {
+               type inet:ip-address ;
+          description "ip address of access circuit's connection." ;
+           }
+           leaf mask-length {
+               type int32 {
+                   range "1..32";
+               }
+          description "mask length of ip address." ;
+           }
+           leaf protocols {
+               type enumeration {
+                   enum static {
+                       value 0 ;
+                       description "static." ;
+                   }
+                   enum ospf {
+                       value 1 ;
+                       description "ospf." ;
+                   }
+                   enum isis {
+                       value 2 ;
+                       description "bgp" ;
+                   }
+                   enum bgp {
+                       value 3 ;
+                       description "bgp" ;
+                   }
+               }
+        description "protocols between PE and CE." ;
+           }
+           container static-routes {
+          description "Defines the static routes." ;
+               list static-route {
+              key "ip-prefix mask-length";
+              description "List of static route." ;
+                   leaf ip-prefix {
+                       type inet:ipv4-address;
+               description "ip prefix" ;
+                   }
+                   leaf mask-length {
+                       type uint32 {
+                            range "1..32";
+                       }
+              description "mast length" ;
+                   }
+                   leaf next-hop {
+                       type inet:ipv4-address ;
+               description "next hop" ;
+                   }
+                   leaf preference {
+                       type uint32 {
+                           range "1..65535";
+                       }
+              description "preference of the route." ;
+                   }
+               }
+           }
+       }
+
+       grouping pw{
+           description "PW definition ";
+           leaf id {
+               type string ;
+          description "ID of pw." ;
+           }
+           uses encaplate-type-grouping;
+
+           leaf ingress-ne-id {
+               type string ;
+          description "ingress ne id." ;
+           }
+
+           leaf egress-ne-id {
+               type string ;
+          description "egress ne id." ;
+           }
+
+           leaf ctrl-word-support {
+               type enumeration {
+                   enum not-support {
+                       value 0 ;
+                       description "pw doesn't support control word" ;
+                   }
+                   enum support {
+                       value 1 ;
+                       description "pw supports control word" ;
+                   }
+               }
+               default support;
+          description "ctrl word support. 0 : not support, 1 : support" ;
+           }
+
+           leaf sn-support {
+               type enumeration {
+                   enum not-support {
+                       value 0 ;
+                       description "pw doesn't support control word" ;
+                   }
+                   enum support {
+                       value 1 ;
+                       description "pw supports control word" ;
+                   }
+               }
+               default not-support;
+          description "serial number support. 0 : not support, 1 : support" ;
+           }
+
+           leaf vccv-type {
+               type enumeration {
+                   enum not-support {
+                       value 0 ;
+                       description "pw doesn't support vccv" ;
+                   }
+                   enum CWD {
+                       value 1 ;
+                       description "pw supports vccv" ;
+                   }
+                   enum Label-alert {
+                       value 2 ;
+                       description "pw supports vccv" ;
+                   }
+                   enum TTL {
+                       value 3 ;
+                       description "pw supports vccv" ;
+                   }
+                   enum CWD&Label-alert {
+                       value 4 ;
+                       description "pw supports vccv" ;
+                   }
+                   enum CWD&TTL {
+                       value 5 ;
+                       description "pw supports vccv" ;
+                   }
+                   enum Label-alert&TTL {
+                       value 6 ;
+                       description "pw supports vccv" ;
+                   }
+                   enum CWD&Label-alert&TTL {
+                       value 7 ;
+                       description "pw supports vccv" ;
+                   }
+               }
+               default not-support;
+               description "vccv type" ;
+           }
+
+           leaf conn-ack-type {
+               type enumeration {
+                   enum not-support {
+                       value 0 ;
+                       description "pw doesn't support connection ack" ;
+                   }
+                   enum support {
+                       value 1 ;
+                       description "pw supports connection ack" ;
+                   }
+               }
+               default not-support;
+               description "Connectivity test type" ;
+           }
+           container tunnels {
+               description "Define tunnels." ;
+               list tunnel{
+                   key "tunnel-id";
+                   description "The list of tunnel id." ;
+                   uses tunnel;
+               }
+           }
+       }
+       grouping tunnel {
+           description "Reusable entity of tunnel." ;
+           leaf tunnel-id {
+               type string ;
+               description "ID of tunnel." ;
+           }
+       }
+       grouping encaplate-type-grouping {
+           description "encaplate type" ;
+           leaf encaplate-type {
+               type enumeration {
+                   enum NONE {
+                       value 0 ;
+                       description "none." ;
+                   }
+                   enum fr-dlci-martini {
+                       value 1 ;
+                       description "fr-dlci-martini." ;
+                   }
+                   enum atm-aal5-sdu {
+                       value 2 ;
+                       description "atm-aal5-sdu." ;
+                   }
+                   enum atm-transparent {
+                       value 3 ;
+                       description "atm-transparent." ;
+                   }
+                   enum ethernet-vlan {
+                       value 4 ;
+                       description "ethernet-vlan." ;
+                   }
+                   enum ethernet  {
+                       value 5 ;
+                       description "ethernet ." ;
+                   }
+                   enum  hdlc {
+                       value 6 ;
+                       description " hdlc." ;
+                   }
+                   enum ppp {
+                       value 7 ;
+                       description "ppp." ;
+                   }
+                   enum cep-mpls {
+                       value 8 ;
+                       description " cep-mpls." ;
+                   }
+                   enum atm-ntol {
+                       value 9 ;
+                       description "atm-ntol." ;
+                   }
+                   enum atm-nto1-vpc {
+                       value 10 ;
+                       description "atm-nto1-vpc." ;
+                   }
+                   enum ip-layer2 {
+                       value 11 ;
+                       description " ip-layer2." ;
+                   }
+                   enum atm-1to1-vcc {
+                       value 12 ;
+                       description "atm-1to1-vcc." ;
+                   }
+                   enum atm-1to1-vpc {
+                       value 13 ;
+                       description "atm-1to1-vpc." ;
+                   }
+                   enum atm-aal5-pdu {
+                       value 14 ;
+                       description "atm-aal5-pdu." ;
+                   }
+                   enum fr-port {
+                       value 15 ;
+                       description "fr-port." ;
+                   }
+                   enum cep-packet {
+                       value 16 ;
+                       description "cep-packet." ;
+                   }
+                   enum e1 {
+                       value 17 ;
+                       description "e1." ;
+                   }
+                    enum t1 {
+                       value 18 ;
+                       description "t1." ;
+                   }
+                   enum e3 {
+                       value 19 ;
+                       description "e3." ;
+                   }
+                   enum t3 {
+                       value 20 ;
+                       description " t3." ;
+                   }
+                   enum cesopsn-basic {
+                       value 21 ;
+                       description "cesopsn-basic." ;
+                   }
+                   enum tdmoip-aal1 {
+                       value 22 ;
+                       description "tdmoip-aal1." ;
+                   }
+                   enum cesopsn-tdm {
+                       value 23 ;
+                       description "cesopsn-tdm." ;
+                   }
+                   enum tdmoip-aal2 {
+                       value 24 ;
+                       description "tdmoip-aal2." ;
+                   }
+                   enum fr-dlci {
+                       value 25 ;
+                       description "fr-dlci." ;
+                   }
+               }
+          description "encaplate type." ;
+           }
+       }
+
+       grouping pw-trail{
+       description "pw trail information." ;
+           leaf id {
+               type string ;
+          description "ID of pw-trail." ;
+           }
+
+           leaf role {
+               type pw-role;
+          description "role of pw-trail." ;
+            }
+           container pw-lists {
+          description "List of pw information." ;
+               list pw-list {
+                    key id;
+             description "List of pw information." ;
+                    uses pw ;
+               }
+           }
+       }
+       grouping tunnel-service {
+           description "Reusable entity of tunnel service." ;
+           leaf signaling-type {
+               type enumeration {
+                   enum RSVP-TE {
+                       value 0 ;
+                       description "RSVP-TE" ;
+                   }
+                   enum LDP {
+                       value 1 ;
+                       description "LDP" ;
+                   }
+                   enum GRE {
+                       value 2 ;
+                       description "GRE" ;
+                   }
+                   enum SR-BE {
+                       value 3 ;
+                       description "SR-BE" ;
+                   }
+                   enum SR-TE {
+                       value 4 ;
+                       description "SR-TE" ;
+                   }
+               }
+               default RSVP-TE;
+          description "signaling type." ;
+           }
+           leaf tunnel-mode {
+               type enumeration {
+                   enum Nto1 {
+                       value 0 ;
+                       description "multi service one tunnel" ;
+                   }
+                   enum 1to1 {
+                       value 1 ;
+                       description "oner service one tunnel" ;
+                   }
+               }
+               default Nto1;
+          description "service to tunnel mode." ;
+           }
+           container protect-policy {
+          description "Protect policy." ;
+               uses protect-policy;
+           }
+           container oam-policy {
+          description "oam policy." ;
+               uses oam-policy;
+           }
+           leaf latency {
+               type int32;
+          description "tunnel latency requirement." ;
+           }
+       }
+       grouping service-path {
+           description "Service path of l3vpn." ;
+         list service-path{
+          key "service-id source-ne-id source-ac-id destination-ne-id destination-ac-id";
+        description
+         "The list of service path.";
+           leaf service-id {
+               type string ;
+          description "l2vpn or l3vpn service id." ;
+           }
+           leaf source-ne-id {
+               type string ;
+          description "source ne id." ;
+           }
+
+           leaf source-ac-id {
+               type string ;
+          description "source ltp id." ;
+           }
+           leaf destination-ne-id {
+               type string ;
+          description "destination ne id." ;
+           }
+
+           leaf destination-ac-id {
+               type string ;
+          description "destination ltp id." ;
+           }
+           container path-lists{
+          description "The path list of service path." ;
+               list path-list {
+                   key "path-layer path-role";
+               description "The path list of service path." ;
+                   leaf path-layer {
+                       type enumeration {
+                           enum PW {
+                               value 0 ;
+                               description "pw path." ;
+                           }
+                           enum BGP-LSP {
+                               value 1 ;
+                               description "BGP-LSP Path." ;
+                           }
+                           enum LSP {
+                               value 2 ;
+                               description "LSP Path." ;
+                           }
+                       }
+               description "path type. 0 : PW, 1 : BGP-LSP, 2 : PW" ;
+                   }
+                   leaf path-role {
+                       type enumeration {
+                           enum Primary {
+                               value 0 ;
+                               description "master path." ;
+                           }
+                           enum Backup {
+                               value 1 ;
+                               description "backup path." ;
+                           }
+                           enum Active {
+                               value 2 ;
+                               description "active path." ;
+                           }
+                       }
+                description "path role.. 0 : master, 1 : backup, 2 :
+   Bypass." ;
+                   }
+                   container paths {
+               description "path definition." ;
+                       list path {
+                           key "ne-id";
+                   description "Network element id list." ;
+                           leaf ne-id {
+                              type string;
+                   description "Network element id." ;
+                           }
+                           leaf ingress-ltp-id {
+                              type string;
+                   description "ingress ltd id." ;
+                           }
+                           leaf backward-peer-id {
+                              type string;
+                   description "backward peer id." ;
+                           }
+                           leaf egress-ltp-id {
+                              type string;
+                   description "egress ltd id." ;
+                           }
+                           leaf forward-peer-id {
+                              type string;
+                   description "forward peer id." ;
+                           }
+                       }
+                   }
+               }
+           }
+
+       }
+     }
+   }