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: 5459	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5459/9cae7bb795a8be403430a5a7a7550a76adbfa8d8/SearchDialog.js/clean/mailnews/base/search/resources/content/SearchDialog.js