KEY-param = KEY-uri-param / KEY-text-param
KEY-value = KEY-uri-value / KEY-text-value
  ; Value and parameter MUST match.

KEY-uri-param = "VALUE=uri" / mediatype-param
KEY-uri-value = URI

KEY-text-param = "VALUE=text"
KEY-text-value = text

KEY-param =/ altid-param / pid-param / pref-param / type-param
           / any-param
