grddl 0.4: June 2010
  - a couple of minor bug fixes to do with security
  - no longer hits W3C site for xhtml DTD (uses a local 'cache'), and other files
    See documentation page, section titled: HTTP 503 Errors and copies of W3C DTDs
    for more detail.
  - upgraded Saxon to Saxon9HE
  

grddl 0.3: Sept 2007
  - implements Rec (modulo security limitations)
  - HTTP header support
  - Transparent Content Negotiation support
  - RDFa support
  - predefined transform support (for microformats)
  

grddl 0.2: March 2007
  - added Java sandbox to improve security
  - added license dialog
  - added http headers support (LINK and PROFILE)

grddl 0.1: January 2007
   first release.
   Implements my best guess of the next version of
     http://www.w3.org/TR/2006/WD-grddl-20061024/
   Does not respect HTTP expiry headers.