diff --git a/pyang/plugins/opc_ua.py b/pyang/plugins/opc_ua.py
new file mode 100644
index 00000000..691dc583
--- /dev/null
+++ b/pyang/plugins/opc_ua.py
@@ -0,0 +1,332 @@
+"""opc_ua output plugin
+1) Invoke with:
+>pyang -f opc_ua <file.yang> > <modeldesign.xml>
+"""
+
+from pyang import error
+from pyang import plugin
+
+
+def pyang_plugin_init():
+    plugin.register_plugin(OPCUAPlugin())
+
+
+yang_to_opcua_data_type = {
+    "binary": "ByteString",
+    "bits": "BitFieldMaskDataType",
+    "boolean": "Boolean",
+    "decimal64": "Double",
+    "empty": "BaseObjectType",
+    "enumeration": "EnumValueType",
+    "int8": "SByte",
+    "int16": "Int16",
+    "int32": "Int32",
+    "int64": "Int64",
+    "string": "String",
+    "uint8": "Byte",
+    "uint16": "UInt16",
+    "uint32": "UInt32",
+    "uint64": "UInt64",
+    "date-and-time": "DateTime",
+    "union": "Union"
+}
+
+
+class OPCUAPlugin(plugin.PyangPlugin):
+    def add_output_format(self, fmts):
+        self.multiple_modules = True
+        fmts['opc_ua'] = self
+
+    def pre_validate(self, ctx, modules):
+        module = modules[0]
+        self.mods = [module.arg] + [i.arg for i in module.search('include')]
+
+    def emit(self, ctx, modules, fd):
+        for epos, etag, eargs in ctx.errors:
+            if ((epos.top is None or epos.top.arg in self.mods) and
+                    error.is_error(error.err_level(etag))):
+                self.fatal("%s contains errors" % epos.top.arg)
+
+        opc_ua_doc = OPCUAEmitter(ctx)
+        opc_ua_doc.emit(modules, fd)
+
+    def fatal(self, exitCode=1):
+        raise error.EmitError(self, exitCode)
+
+
+def convert_to_camel_case(text):
+    return ''.join(word.capitalize() for word in text.split('-'))
+
+
+class OPCUAEmitter:
+    def __init__(self, ctx):
+        self._ctx = ctx
+
+    def emit(self, modules, fd):
+        for module in modules:
+            self.emit_module_header(module, fd)
+            for s in module.substmts:
+                self.emit_stmt(module, s, fd)
+            self.emit_module_footer(module, fd)
+
+            # print('!!!!!!!!!! Substatements !!!!!!!!!')
+            # for s in module.substmts:
+            #     print(f'Statemet {s}')
+            #     if s.keyword == 'container':
+            #         print('!!!!!!!!!!! Substatements !!!!!!!!!!')
+            #         for substmt in s.substmts:
+            #             print(f'sub - {substmt}')
+            #             if substmt.keyword == 'leaf':
+            #                 val = substmt.search_one('type')
+            #                 print(f'Type of substatement - {val}')
+            #                 print(f'Value of substatement - {val.arg}')
+
+    def emit_stmt(self, mod, stmt, fd):
+        if stmt.keyword == 'container':
+            self.emit_container(stmt, fd, 4)
+
+        elif stmt.keyword == 'leaf' or stmt.keyword == 'leaf-list':
+            self.emit_leaf(stmt, fd, 4)
+
+        elif stmt.keyword == 'typedef':
+            self.emit_typedef(stmt, fd, 4)
+
+        elif stmt.keyword == 'rpc':
+            self.emit_rpc(stmt, fd, 4)
+
+        elif stmt.keyword == 'grouping':
+            self.emit_grouping(stmt, fd, 4)
+
+        elif stmt.keyword == 'list':
+            self.emit_list(stmt, fd, 4)
+
+    def emit_child_stmt(self, parent, node, fd, num_spaces):
+        if node.keyword == 'leaf' or node.keyword == 'leaf-list':
+            if parent.keyword == 'rpc':
+                self.emit_leaf(node, fd, num_spaces + 2, is_rpc=True)
+            else:
+                self.emit_leaf(node, fd, num_spaces + 2, is_rpc=False)
+
+        elif node.keyword == 'container':
+            self.emit_container(node, fd, num_spaces + 2)
+
+        elif node.keyword == 'rpc':
+            self.emit_rpc(node, fd, num_spaces + 2)
+
+        elif node.keyword == 'uses':
+            parent_name = node.arg
+            self.emit_uses(node, fd, num_spaces + 2, parent_name)
+
+        elif node.keyword == 'list':
+            self.emit_list(node, fd, num_spaces + 2)
+
+    def emit_module_header(self, module, fd):
+        namespace = 'http://opcfoundation.org/UA/default/'
+        namespace_name = ''
+        version = '1.0'
+        prefix = ''
+        if module.search_one('namespace') is not None:
+            namespace = module.search_one('namespace').arg
+        if module.search_one('revision') is not None:
+            version = module.search_one('revision').arg
+        if module.search_one('prefix') is not None:
+            prefix = module.search_one('prefix').arg
+
+        if len(namespace.split("/")) > 1:
+            namespace_name = namespace.split("/")[-2]
+        else:
+            namespace_name = namespace.split(":")[-1]
+        fd.write('<?xml version="1.0" encoding="utf-8"?>\n'
+                 '<opc:ModelDesign\n'
+                 '    xmlns:uax="http://opcfoundation.org/UA/2008/02/Types.xsd"\n'
+                 '    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"\n'
+                 '    xmlns:ua="http://opcfoundation.org/UA/"\n'
+                 '    xmlns:opc="http://opcfoundation.org/UA/ModelDesign.xsd"\n'
+                 '    xmlns:xsd="http://www.w3.org/2001/XMLSchema"\n'
+                 '    xmlns=\"%s\"\n'
+                 '    TargetNamespace=\"%s\"\n'
+                 '    TargetVersion=\"%s\">\n\n' % (namespace, namespace, version))
+
+        fd.write('    <opc:Namespaces>\n'
+                 '        <opc:Namespace Name=\"%s\" Prefix=\"%s\" XmlPrefix=\"%s\">%s</opc:Namespace>\n'
+                 '%s'
+                 '    </opc:Namespaces>\n\n' % (
+                     namespace_name, prefix, prefix, namespace, self.emit_import_include(module, fd)))
+
+    def emit_import_include(self, module, fd):
+        namespace = 'http://opcfoundation.org/UA/default/'
+        temp_str = ''
+        if module.search('import') is not None or module.search('include') is not None:
+            for stmt in module.substmts:
+                if stmt.keyword == 'import' or stmt.keyword == 'include':
+                    for s in stmt.substmts:
+                        import_name = stmt.arg
+                        prefix = s.arg
+                        temp_str += f'        <opc:Namespace Name="{import_name}" Prefix="{prefix}" XmlPrefix="{prefix}">{namespace}</opc:Namespace>\n'
+
+        return temp_str
+
+    def emit_module_footer(self, module, fd):
+        fd.write('</opc:ModelDesign>')
+
+    def emit_container(self, node, fd, num_space):
+        spaces = ' ' * num_space
+        container_name = node.arg
+        fd.write(
+            f'{spaces}<opc:ObjectType SymbolicName="{convert_to_camel_case(container_name)}Type" BaseType="ua:BaseObjectType">\n'
+            f'{" " * (num_space + 2)}<opc:Children>\n')
+
+        for s in node.substmts:
+            self.emit_child_stmt(node, s, fd, num_space + 4)
+
+        fd.write(f'{" " * (num_space + 2)}</opc:Children>\n'
+                 f'{spaces}</opc:ObjectType>\n\n'
+                 f'{spaces}<opc:Object SymbolicName="{convert_to_camel_case(container_name)}" TypeDefinition="{convert_to_camel_case(container_name)}Type">\n'
+                 f'{" " * (num_space + 2)}<opc:Children>\n'
+                 f'{" " * (num_space + 4)}<opc:References>\n'
+                 f'{" " * (num_space + 6)}<opc:Reference IsInverse="true">\n'
+                 f'{" " * (num_space + 8)}<opc:ReferenceType>SignalTo</opc:ReferenceType>\n'
+                 f'{" " * (num_space + 6)}</opc:Reference>\n'
+                 f'{" " * (num_space + 4)}</opc:References>\n'
+                 f'{" " * (num_space + 2)}</opc:Children>\n'
+                 f'{spaces}</opc:Object>\n')
+
+    def emit_leaf(self, node, fd, num_space, is_rpc=False):
+        spaces = ' ' * num_space
+        leaf_name = node.arg
+        leaf_type = yang_to_opcua_data_type.get(node.search_one('type').arg, 'Unknown OPC UA data type')
+        leaf_default_value = None
+        leaf_description = None
+        leaf_property = 'Property'
+
+        if node.search_one('config') is not None and node.search_one('config').arg == 'true':
+            leaf_property = 'Variable'
+
+        if is_rpc:
+            leaf_property = 'Argument'
+
+        if node.search_one('default') is not None:
+            leaf_default_value = node.search_one('default').arg
+
+        if node.search_one('description') is not None:
+            leaf_description = node.search_one('description').arg
+
+        fd.write(
+            f'{spaces}<opc:{leaf_property} SymbolicName="{convert_to_camel_case(leaf_name)}" DataType="{leaf_type}" AccessLevel="Read"> \n')
+        if leaf_default_value is not None:
+            fd.write(
+                f'{spaces}  <opc:DefaultValue> <uax:{leaf_type}>{leaf_default_value}</uax:{leaf_type}> </opc:DefaultValue>\n')
+        if leaf_description is not None:
+            fd.write(f'{spaces}  <opc:Description>{leaf_description}</opc:Description>\n')
+        fd.write(f'{spaces}</opc:{leaf_property}>\n')
+
+    def emit_rpc(self, node, fd, num_space):
+        spaces = ' ' * num_space
+        rpc_name = node.arg
+        fd.write(
+            f'\n{spaces}<opc:Method SymbolicName="{convert_to_camel_case(rpc_name)}" ModellingRule="Mandatory">\n')
+
+        for stmt in node.substmts:
+            if stmt.keyword == 'input':
+                for s in stmt.substmts:
+                    fd.write(f'{" " * (num_space + 2)}<opc:InputArguments>\n')
+                    self.emit_child_stmt(node, s, fd, num_space + 4)
+                    fd.write(f'{" " * (num_space + 2)}</opc:InputArguments>\n')
+
+            elif stmt.keyword == 'output':
+                for s in stmt.substmts:
+                    fd.write(f'{" " * (num_space + 2)}<opc:OutputArguments>\n')
+                    self.emit_child_stmt(node, s, fd, num_space + 4)
+                    fd.write(f'{" " * (num_space + 2)}</opc:OutputArguments>\n')
+
+        fd.write(f'{spaces}</opc:Method>\n\n')
+
+    def emit_typedef(self, node, fd, num_space):
+        spaces = ' ' * num_space
+        typedef_name = node.arg
+        typedef_default_value = None
+        typedef_description = None
+        typedef_type = None
+
+        if node.search_one('default') is not None:
+            typedef_default_value = node.search_one('default').arg
+
+        if node.search_one('description') is not None:
+            typedef_description = node.search_one('description').arg
+
+        if node.search_one('type') is not None:
+            if node.search_one('type').arg == 'enumeration':
+                typedef_type = 'Enumeration'
+                fd.write(
+                    f'{spaces}<opc:DataType SymbolicName="{convert_to_camel_case(typedef_name)}Type" BaseType="ua:{typedef_type}"> \n'
+                    f'{spaces}  <opc:Fields>\n')
+
+                for stmt in node.substmts:
+                    enum_names = stmt.search('enum')
+                    k = 0
+                    for s in stmt.substmts:
+                        fd.write(f'{spaces}    <opc:Field Name="{enum_names[k]}" ')
+                        k += 1
+                        if s.search_one('value') is not None:
+                            value = s.search_one('value').arg
+                            fd.write(f' Identifier="{value}" ')
+                        if s.search_one('description') is not None:
+                            desc = s.search_one('description').arg
+                            fd.write(f' Description="{desc}" ')
+                        fd.write('/>\n')
+                fd.write(f'{spaces}  </opc:Fields>\n'
+                         f'{spaces}</opc:DataType>\n')
+                return
+
+            else:
+                typedef_type = yang_to_opcua_data_type.get(node.search_one('type').arg, "Unknown OpcUa data type")
+                if typedef_type != 'Unknown OpcUa data type':
+                    yang_to_opcua_data_type[typedef_type] = typedef_type
+
+        fd.write(
+            f'{spaces}<opc:DataType SymbolicName="{convert_to_camel_case(typedef_name)}" BaseType="ua:{typedef_type}"> \n')
+        if typedef_default_value is not None:
+            fd.write(
+                f'{spaces}  <opc:DefaultValue> <uax:{typedef_type}>{typedef_default_value}</uax:{typedef_type}> </opc:DefaultValue>\n')
+        if typedef_description is not None:
+            fd.write(f'{spaces}  <opc:Description>{typedef_description}</opc:Description>\n')
+        fd.write(f'{spaces}</opc:DataType>\n')
+
+    def emit_uses(self, node, fd, num_space, parent_name):
+        spaces = ' ' * num_space
+        grouping_name = node.arg
+        fd.write(
+            f'{spaces}<opc:Object SymbolicName="{convert_to_camel_case(parent_name)}" TypeDefinition="{convert_to_camel_case(grouping_name)}Type">\n'
+            f'{spaces}</opc:Object>\n')
+
+    def emit_list(self, node, fd, num_space):
+        spaces = ' ' * num_space
+        list_name = node.arg
+
+        fd.write(
+            f'{spaces}<opc:ObjectType SymbolicName="{convert_to_camel_case(list_name)}EntryType" BaseType="ua:BaseObjectType">\n'
+            f'{" " * (num_space + 2)}<opc:Children>\n')
+
+        for s in node.substmts:
+            self.emit_child_stmt(node, s, fd, num_space + 4)
+
+        fd.write(f'{" " * (num_space + 2)}</opc:Children>\n'
+                 f'{spaces}</opc:ObjectType>\n'
+                 f'{spaces}<opc:ObjectType SymbolicName="{convert_to_camel_case(list_name)}Type" BaseType="ua:BaseObjectType">\n'
+                 f'{" " * (num_space + 2)}<opc:Children>\n'
+                 f'{" " * (num_space + 4)}<opc:ReferenceType TypeDefinition="{convert_to_camel_case(list_name)}EntryType"/>\n'
+                 f'{" " * (num_space + 2)}</opc:Children>\n'
+                 f'{spaces}</opc:ObjectType>\n')
+
+    def emit_grouping(self, node, fd, num_space):
+        spaces = ' ' * num_space
+        grouping_name = node.arg
+        fd.write(
+            f'{spaces}<opc:ObjectType SymbolicName="{convert_to_camel_case(grouping_name)}Type" BaseType="ua:BaseObjectType">\n'
+            f'{" " * (num_space + 2)}<opc:Children>\n')
+
+        for s in node.substmts:
+            self.emit_child_stmt(node, s, fd, num_space + 2)
+
+        fd.write(f'{" " * (num_space + 2)}</opc:Children>\n'
+                 f'{spaces}</opc:ObjectType>\n\n')