Writing schema in HTML
----------------------

The rule of writing schemas in both HTML and schema-script can be simple:
   put all HTML tags 
      at the beginning, before double-reverse-slash
      in the middle,    after comments starting with apostrophe
      at the end,       after statment |end
      (in other words, don't put HTML tags in the schema-body)

   don't use HTML-unsafe characters   >  <  &  in the schema-body
   " can be used in schema-body if browser understands it in plain text,
     and good browser always understands.