ed-string  = ( <"> *(qdtext | quoted-pair ) <"> )
 qdtext         = <any TEXT except <">>
 </pre>
 <p>
  The backslash character ("\") MAY be used as a single-character quoting mechanism only 
  within quoted-string and comment constructs.
 </p>
 <pre>
 quoted-pair    = "\" CHAR
 </pre>
 <h>3.6 Transfer Codings</h>
 <p>
  Parameters are in the form of attribute/value pairs.
 </p>
 <pre>
 parameter               = attribute "=" value
 attribute               = token
 value                   = token | quoted-