OpenSearch is available in the following versions:

1.0_pgwsdlNEWS.html at March 14 2011
1.1wsdlNEWS.html at March 9 2011
1.0wsdlNEWS.html at September 9 2010
0.14_pgwsdlNEWS.html at August 6 2010
0.14_testwsdlNEWS.html at July 1 2010
0.14wsdlNEWS.html at July 1 2010

Further information can be found at: oss.dbc.dk