anchor.diff:  xml_attributes_clause
       : XMLATTRIBUTES
        '(' (ENTITYESCAPING | NOENTITYESCAPING)? (SCHEMACHECK | NOSCHEMACHECK)?
  -     xml_multiuse_expression_element (',' xml_multiuse_expression_element)* ')'
  +     (','? xml_multiuse_expression_element)+ ')'
       ;
   
   xml_namespaces_clause
  
positive.code:     ;
  
  create_index
      : CREATE UNIQUE? INDEX index_name ON tableview_name '(' column_name (',' column_name)* ')' (COMPUTE STATISTICS)? ';'
      ;
  
  alter_index
  
negative.code:     ;
  
  model_rules_clause
      : model_rules_part? '(' (','? model_rules_element)* ')'
      ;
  
  model_rules_part
  