Statement tags

Statements are:

    <print> 
  | <eval> 
  | <if> 
  | <while> 
  | <return> 
  | <break> 
  | <continue> 
  | <switch> 
  | <foreach> 
  | <for> 
  | <call> 
  | <invoke> 
  | <preserve> 
  | <compress> 
  | <silent> 
  | <pack> 
  | tags
  | cdata