rem: gFolderDatasource = Components.classes[folderDSContractID].createInstance(Components.interfaces.nsIRDFDataSource); 
add: gFolderDatasource = Components.classes[folderDSContractID].getService(Components.interfaces.nsIRDFDataSource); 
context: function GetFolderDatasource(){    if (!gFolderDatasource)        gFolderDatasource = Components.classes[folderDSContractID].createInstance(Components.interfaces.nsIRDFDataSource);    return gFolderDatasource;}
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/2009617be24d9bb384cf6790d0e28eeb19329a27/SearchDialog.js/clean/mailnews/base/search/resources/content/SearchDialog.js