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+   module ietf-netconf-nmda {
+     yang-version 1.1;
+     namespace "urn:ietf:params:xml:ns:yang:ietf-netconf-nmda";
+     prefix ncds;
+
+     import ietf-yang-types {
+       prefix yang;
+       reference
+         "RFC 6991: Common YANG Data Types";
+     }
+     import ietf-inet-types {
+       prefix inet;
+       reference
+         "RFC 6991: Common YANG Data Types";
+     }
+     import ietf-datastores {
+       prefix ds;
+       reference
+         "RFC 8342: Network Management Datastore Architecture
+                    (NMDA)";
+     }
+     import ietf-origin {
+       prefix or;
+       reference
+         "RFC 8342: Network Management Datastore Architecture
+                    (NMDA)";
+     }
+     import ietf-netconf {
+       prefix nc;
+       reference
+         "RFC 6241: Network Configuration Protocol (NETCONF)";
+     }
+     import ietf-netconf-with-defaults {
+       prefix ncwd;
+       reference
+         "RFC 6243: With-defaults Capability for NETCONF";
+     }
+
+     organization
+       "IETF NETCONF Working Group";
+
+     contact
+       "WG Web:   <https://datatracker.ietf.org/wg/netconf/>
+
+        WG List:  <mailto:netconf@ietf.org>
+
+        Author:   Martin Bjorklund
+                  <mailto:mbj@tail-f.com>
+
+        Author:   Juergen Schoenwaelder
+                  <mailto:j.schoenwaelder@jacobs-university.de>
+
+        Author:   Phil Shafer
+                  <mailto:phil@juniper.net>
+
+        Author:   Kent Watsen
+                  <mailto:kent+ietf@watsen.net>
+
+        Author:   Robert Wilton
+                  <mailto:rwilton@cisco.com>";
+     description
+       "This YANG module defines a set of NETCONF operations to support
+        the Network Management Datastore Architecture (NMDA).
+
+        The key words 'MUST', 'MUST NOT', 'REQUIRED', 'SHALL', 'SHALL
+        NOT', 'SHOULD', 'SHOULD NOT', 'RECOMMENDED', 'NOT RECOMMENDED',
+        'MAY', and 'OPTIONAL' in this document are to be interpreted as
+        described in BCP 14 (RFC 2119) (RFC 8174) when, and only when,
+        they appear in all capitals, as shown here.
+
+        Copyright (c) 2019 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
+        (https://trustee.ietf.org/license-info).
+
+        This version of this YANG module is part of RFC 8526; see
+        the RFC itself for full legal notices.";
+
+     revision 2019-01-07 {
+       description
+         "Initial revision.";
+       reference
+         "RFC 8526: NETCONF Extensions to Support the Network Management
+                    Datastore Architecture";
+     }
+
+     feature origin {
+       description
+         "Indicates that the server supports the 'origin' annotation.";
+       reference
+         "RFC 8342: Network Management Datastore Architecture (NMDA)";
+     }
+
+     feature with-defaults {
+       description
+         "NETCONF :with-defaults capability.  If the server advertises
+          the :with-defaults capability for a session, then this
+          feature must also be enabled for that session.  Otherwise,
+          this feature must not be enabled.";
+       reference
+         "RFC 6243: With-defaults Capability for NETCONF, Section 4; and
+          RFC 8526: NETCONF Extensions to Support the Network Management
+                    Datastore Architecture, Section 3.1.1.2";
+     }
+
+     rpc get-data {
+       description
+         "Retrieve data from an NMDA datastore.  The content returned
+          by get-data must satisfy all filters, i.e., the filter
+          criteria are logically ANDed.
+
+          Any ancestor nodes (including list keys) of nodes selected by
+          the filters are included in the response.
+
+          The 'with-origin' parameter is only valid for an operational
+          datastore.  If 'with-origin' is used with an invalid
+          datastore, then the server MUST return an <rpc-error> element
+          with an <error-tag> value of 'invalid-value'.
+
+          The 'with-defaults' parameter only applies to the operational
+          datastore if the NETCONF :with-defaults and
+          :with-operational-defaults capabilities are both advertised.
+          If the 'with-defaults' parameter is present in a request for
+          which it is not supported, then the server MUST return an
+          <rpc-error> element with an <error-tag> value of
+          'invalid-value'.";
+       input {
+         leaf datastore {
+           type ds:datastore-ref;
+           mandatory true;
+           description
+             "Datastore from which to retrieve data.
+
+              If the datastore is not supported by the server, then the
+              server MUST return an <rpc-error> element with an
+              <error-tag> value of 'invalid-value'.";
+         }
+         choice filter-spec {
+           description
+             "The content filter specification for this request.";
+           anydata subtree-filter {
+             description
+               "This parameter identifies the portions of the
+                target datastore to retrieve.";
+             reference
+               "RFC 6241: Network Configuration Protocol (NETCONF),
+                          Section 6";
+           }
+           leaf xpath-filter {
+             if-feature "nc:xpath";
+             type yang:xpath1.0;
+             description
+               "This parameter contains an XPath expression identifying
+                the portions of the target datastore to retrieve.
+
+                If the expression returns a node-set, all nodes in the
+                node-set are selected by the filter.  Otherwise, if the
+                expression does not return a node-set, then the
+                <get-data> operation fails.
+
+                The expression is evaluated in the following XPath
+                context:
+
+                  o  The set of namespace declarations are those in
+                     scope on the 'xpath-filter' leaf element.
+
+                  o  The set of variable bindings is empty.
+
+                  o  The function library is the core function library,
+                     and the XPath functions are defined in Section 10
+                     of RFC 7950.
+
+                  o  The context node is the root node of the target
+                     datastore.";
+           }
+         }
+         leaf config-filter {
+           type boolean;
+           description
+             "Filter for nodes with the given value for their 'config'
+              property.  When this leaf is set to 'true', only 'config
+              true' nodes are selected, and when set to 'false', only
+              'config false' nodes are selected.  If this leaf is not
+              present, no nodes are filtered.";
+         }
+         choice origin-filters {
+           when 'derived-from-or-self(datastore, "ds:operational")';
+           if-feature "origin";
+           description
+             "Filters configuration nodes based on the 'origin'
+              annotation.  Configuration nodes that do not have an
+              'origin' annotation are treated as if they have the
+              'origin' annotation 'or:unknown'.
+
+              System state nodes are not affected by origin-filters and
+              thus not filtered.  Note that system state nodes can be
+              filtered with the 'config-filter' leaf.";
+
+           leaf-list origin-filter {
+             type or:origin-ref;
+             description
+               "Filter based on the 'origin' annotation.  A
+                configuration node matches the filter if its 'origin'
+                annotation is derived from or equal to any of the given
+                filter values.";
+           }
+           leaf-list negated-origin-filter {
+             type or:origin-ref;
+             description
+               "Filter based on the 'origin' annotation.  A
+                configuration node matches the filter if its 'origin'
+                annotation is neither derived from nor equal to any of
+                the given filter values.";
+           }
+         }
+         leaf max-depth {
+           type union {
+             type uint16 {
+               range "1..65535";
+             }
+             type enumeration {
+               enum unbounded {
+                 description
+                   "All descendant nodes are included.";
+               }
+             }
+           }
+           default "unbounded";
+           description
+             "For each node selected by the filters, this parameter
+              selects how many conceptual subtree levels should be
+              returned in the reply.  If the depth is 1, the reply
+              includes just the selected nodes but no children.  If the
+              depth is 'unbounded', all descendant nodes are included.";
+         }
+         leaf with-origin {
+           when 'derived-from-or-self(../datastore, "ds:operational")';
+           if-feature "origin";
+           type empty;
+           description
+             "If this parameter is present, the server will return
+              the 'origin' annotation for the nodes that have one.";
+         }
+         uses ncwd:with-defaults-parameters {
+           if-feature "with-defaults";
+         }
+       }
+       output {
+         anydata data {
+           description
+             "Copy of the source datastore subset that matched
+              the filter criteria (if any).  An empty data
+              container indicates that the request did not
+              produce any results.";
+         }
+       }
+     }
+
+     rpc edit-data {
+       description
+         "Edit data in an NMDA datastore.
+
+          If an error condition occurs such that an error severity
+          <rpc-error> element is generated, the server will stop
+          processing the <edit-data> operation and restore the
+          specified configuration to its complete state at
+          the start of this <edit-data> operation.";
+       input {
+         leaf datastore {
+           type ds:datastore-ref;
+           mandatory true;
+           description
+             "Datastore that is the target of the <edit-data> operation.
+
+              If the target datastore is not writable, or is not
+              supported by the server, then the server MUST return an
+              <rpc-error> element with an <error-tag> value of
+              'invalid-value'.";
+         }
+         leaf default-operation {
+           type enumeration {
+             enum merge {
+               description
+                 "The default operation is merge.";
+             }
+             enum replace {
+               description
+                 "The default operation is replace.";
+             }
+             enum none {
+               description
+                 "There is no default operation.";
+             }
+           }
+           default "merge";
+           description
+             "The default operation to use.";
+         }
+         choice edit-content {
+           mandatory true;
+           description
+             "The content for the edit operation.";
+           anydata config {
+             description
+               "Inline config content.";
+           }
+           leaf url {
+             if-feature "nc:url";
+             type inet:uri;
+             description
+               "URL-based config content.";
+           }
+         }
+       }
+     }
+
+     /*
+      * Augment the <lock> and <unlock> operations with a
+      * "datastore" parameter.
+      */
+
+     augment "/nc:lock/nc:input/nc:target/nc:config-target" {
+       description
+         "Add NMDA datastore as target.";
+       leaf datastore {
+         type ds:datastore-ref;
+         description
+           "Datastore to lock.
+
+            The <lock> operation is only supported on writable
+            datastores.
+
+            If the <lock> operation is not supported by the server on
+            the specified target datastore, then the server MUST return
+            an <rpc-error> element with an <error-tag> value of
+            'invalid-value'.";
+       }
+     }
+
+     augment "/nc:unlock/nc:input/nc:target/nc:config-target" {
+       description
+         "Add NMDA datastore as target.";
+       leaf datastore {
+         type ds:datastore-ref;
+         description
+           "Datastore to unlock.
+
+            The <unlock> operation is only supported on writable
+            datastores.
+
+            If the <unlock> operation is not supported by the server on
+            the specified target datastore, then the server MUST return
+            an <rpc-error> element with an <error-tag> value of
+            'invalid-value'.";
+       }
+     }
+
+     /*
+      * Augment the <validate> operation with a
+      * "datastore" parameter.
+      */
+
+     augment "/nc:validate/nc:input/nc:source/nc:config-source" {
+       description
+         "Add NMDA datastore as source.";
+       leaf datastore {
+         type ds:datastore-ref;
+         description
+           "Datastore to validate.
+
+            The <validate> operation is supported only on configuration
+            datastores.
+
+            If the <validate> operation is not supported by the server
+            on the specified target datastore, then the server MUST
+            return an <rpc-error> element with an <error-tag> value of
+            'invalid-value'.";
+       }
+     }
+   }