ANYXML_KEYWORD | IDENTIFIER) string? (SEMICOLON | (LEFT_BRACE (unknown_statement | identifier_stmt)* RIGHT_BRACE)*);
stmtend : (SEMICOLON) | (LEFT_BRACE identifier_stmt? RIGHT_BRACE);
+
+/* DO NOT replace stmtsep in rest of grammar with identifier_stmt!!! It might seems as code duplicity here, but this one is necessary.
+ Body of identifier_stmt generated from this grammar in YangParserListener is implemented in YangParserListenerImpl.
+ To ensure that all of the identifier_stmts will be resolved correctly the YangParserListenerImpl contains code that handles
+ specifcly identifier_stmts -> i.e. transforms identifier_stmt into QName. The stmtsep is used for parsing extension statements
+ placed outside of body_stmt.
+ */
+stmtsep : IDENTIFIER string? (stmtend | (LEFT_BRACE unknown_statement* RIGHT_BRACE));
deviate_replace_stmt : DEVIATE_KEYWORD string /* REPLACE_KEYWORD */ (SEMICOLON | (LEFT_BRACE (identifier_stmt |type_stmt | units_stmt | default_stmt | config_stmt | mandatory_stmt | min_elements_stmt | max_elements_stmt )* RIGHT_BRACE));
deviate_delete_stmt : DEVIATE_KEYWORD string /* DELETE_KEYWORD */ (SEMICOLON | (LEFT_BRACE (identifier_stmt |units_stmt | must_stmt | unique_stmt | default_stmt )* RIGHT_BRACE));
deviate_add_stmt : DEVIATE_KEYWORD string /*ADD_KEYWORD*/ (SEMICOLON | (LEFT_BRACE (identifier_stmt |units_stmt | must_stmt | unique_stmt | default_stmt | config_stmt | mandatory_stmt | min_elements_stmt | max_elements_stmt )* RIGHT_BRACE));
rpc_stmt : RPC_KEYWORD string (SEMICOLON | (LEFT_BRACE (identifier_stmt |if_feature_stmt | status_stmt | description_stmt | reference_stmt | typedef_stmt | grouping_stmt | input_stmt | output_stmt )* RIGHT_BRACE));
when_stmt : WHEN_KEYWORD string (SEMICOLON | (LEFT_BRACE (identifier_stmt |description_stmt | reference_stmt )* RIGHT_BRACE));
-augment_stmt : AUGMENT_KEYWORD string LEFT_BRACE (identifier_stmt |when_stmt | if_feature_stmt | status_stmt | description_stmt | reference_stmt | data_def_stmt | case_stmt)+ RIGHT_BRACE;
-uses_augment_stmt : AUGMENT_KEYWORD string LEFT_BRACE (identifier_stmt |when_stmt | if_feature_stmt | status_stmt | description_stmt | reference_stmt | data_def_stmt | case_stmt)+ RIGHT_BRACE;
+augment_stmt : AUGMENT_KEYWORD string LEFT_BRACE (identifier_stmt |when_stmt | if_feature_stmt | status_stmt | description_stmt | reference_stmt | data_def_stmt | case_stmt)* RIGHT_BRACE;
+uses_augment_stmt : AUGMENT_KEYWORD string LEFT_BRACE (identifier_stmt |when_stmt | if_feature_stmt | status_stmt | description_stmt | reference_stmt | data_def_stmt | case_stmt)* RIGHT_BRACE;
refine_anyxml_stmts : (identifier_stmt |must_stmt | config_stmt | mandatory_stmt | description_stmt | reference_stmt )*;
refine_case_stmts : (identifier_stmt |description_stmt | reference_stmt )*;
refine_choice_stmts : (identifier_stmt |default_stmt | config_stmt | mandatory_stmt | description_stmt | reference_stmt )*;
position_stmt : POSITION_KEYWORD string stmtend;
bit_stmt : BIT_KEYWORD string (SEMICOLON | (LEFT_BRACE (identifier_stmt |position_stmt | status_stmt | description_stmt | reference_stmt )* RIGHT_BRACE));
bits_specification : bit_stmt (bit_stmt | identifier_stmt)*;
-union_specification : type_stmt (identifier_stmt | type_stmt )+;
+union_specification : type_stmt (identifier_stmt | type_stmt )*;
identityref_specification : base_stmt ;
instance_identifier_specification : (require_instance_stmt )?;
require_instance_arg :string; // TRUE_KEYWORD | FALSE_KEYWORD;
yang_version_stmt : YANG_VERSION_KEYWORD string stmtend;
data_def_stmt : container_stmt | leaf_stmt | leaf_list_stmt | list_stmt | choice_stmt | anyxml_stmt | uses_stmt;
body_stmts : (( identifier_stmt| extension_stmt | feature_stmt | identity_stmt | typedef_stmt | grouping_stmt | data_def_stmt | augment_stmt | rpc_stmt | notification_stmt | deviation_stmt) )*;
-revision_stmts : (revision_stmt )*;
-linkage_stmts : (import_stmt | include_stmt )*;
-meta_stmts : (organization_stmt | contact_stmt | description_stmt | reference_stmt )*;
-submodule_header_stmts : (yang_version_stmt | belongs_to_stmt)+ ;
-module_header_stmts : (yang_version_stmt | namespace_stmt | prefix_stmt)+ ;
-submodule_stmt : SUBMODULE_KEYWORD string LEFT_BRACE submodule_header_stmts linkage_stmts meta_stmts revision_stmts body_stmts RIGHT_BRACE;
-module_stmt : MODULE_KEYWORD string LEFT_BRACE module_header_stmts linkage_stmts meta_stmts revision_stmts body_stmts RIGHT_BRACE;
+revision_stmts : (revision_stmt | stmtsep)*;
+linkage_stmts : (import_stmt stmtsep* | include_stmt stmtsep*)*;
+meta_stmts : (organization_stmt stmtsep* | contact_stmt stmtsep* | description_stmt stmtsep* | reference_stmt stmtsep*)*;
+submodule_header_stmts : (yang_version_stmt stmtsep* | belongs_to_stmt stmtsep*)+ ;
+module_header_stmts : (yang_version_stmt stmtsep* | namespace_stmt stmtsep* | prefix_stmt stmtsep*)+ ;
+submodule_stmt : SUBMODULE_KEYWORD string LEFT_BRACE stmtsep* submodule_header_stmts linkage_stmts meta_stmts revision_stmts body_stmts RIGHT_BRACE;
+module_stmt : MODULE_KEYWORD string LEFT_BRACE stmtsep* module_header_stmts linkage_stmts meta_stmts revision_stmts body_stmts RIGHT_BRACE;
\ No newline at end of file