<xs:group name="schema_definition_and_manipulation">
  <xs:annotation>
    <xs:documentation xml:lang="en">Schema definition and manipulation. this group is used for documentation only, not used in XML file.</xs:documentation>
  </xs:annotation>
  <xs:all>
    <xs:element ref="schema_definition"/>
    <xs:element ref="drop_schema_statement"/>
    <xs:element ref="table_definition"/>
    <xs:element ref="column_definition"/>
    <xs:element ref="default_clause"/>
    <xs:element ref="table_constraint_definition"/>
    <xs:element ref="unique_constraint_definition"/>
    <xs:element ref="referential_constraint_definition"/>
    <xs:element ref="check_constraint_definition"/>
    <xs:element ref="alter_table_statement"/>
    <xs:element ref="add_column_definition"/>
    <xs:element ref="alter_column_definition"/>
    <xs:element ref="set_column_default_clause"/>
    <xs:element ref="drop_column_default_clause"/>
    <xs:element ref="add_column_scope_clause"/>
    <xs:element ref="drop_column_scope_clause"/>
    <xs:element ref="alter_identity_column_specification"/>
    <xs:element ref="drop_column_definition"/>
    <xs:element ref="add_table_constraint_definition"/>
    <xs:element ref="drop_table_constraint_definition"/>
    <xs:element ref="drop_table_statement"/>
    <xs:element ref="view_definition"/>
    <xs:element ref="drop_view_statement"/>
    <xs:element ref="domain_definition"/>
    <xs:element ref="alter_domain_statement"/>
    <xs:element ref="set_domain_default_clause"/>
    <xs:element ref="drop_domain_default_clause"/>
    <xs:element ref="add_domain_constraint_definition"/>
    <xs:element ref="drop_domain_constraint_definition"/>
    <xs:element ref="drop_domain_statement"/>
    <xs:element ref="character_set_definition"/>
    <xs:element ref="drop_character_set_statement"/>
    <xs:element ref="collation_definition"/>
    <xs:element ref="drop_collation_statement"/>
    <xs:element ref="transliteration_definition"/>
    <xs:element ref="drop_transliteration_statement"/>
    <xs:element ref="assertion_definition"/>
    <xs:element ref="drop_assertion_statement"/>
    <xs:element ref="trigger_definition"/>
    <xs:element ref="drop_trigger_statement"/>
    <xs:element ref="user_defined_type_definition"/>
    <xs:element ref="attribute_definition"/>
    <xs:element ref="alter_type_statement"/>
    <xs:element ref="add_attribute_definition"/>
    <xs:element ref="drop_attribute_definition"/>
    <xs:element ref="add_original_method_specification"/>
    <xs:element ref="add_overriding_method_specification"/>
    <xs:element ref="drop_method_specifcation"/>
    <xs:element ref="drop_data_type_statement"/>
    <xs:element ref="sql_invoked_routine"/>
    <xs:element ref="alter_routine_statement"/>
    <xs:element ref="drop_routine_statement"/>
    <xs:element ref="user_defined_cast_definition"/>
    <xs:element ref="drop_user_defined_cast_statement"/>
    <xs:element ref="user_defined_ordering_definition"/>
    <xs:element ref="drop_user_defined_ordering_statement"/>
    <xs:element ref="transform_definition"/>
    <xs:element ref="alter_transform_statement"/>
    <xs:element ref="add_transform_element_list"/>
    <xs:element ref="drop_transform_element_list"/>
    <xs:element ref="drop_transform_statement"/>
    <xs:element ref="sequence_generator_definition"/>
    <xs:element ref="alter_sequence_generator_statement"/>
    <xs:element ref="drop_sequence_generator_statement"/>
  </xs:all>
</xs:group>