3 XMLIdealGeometryESSource = cms.ESSource(
"XMLIdealGeometryESSource",
4 geomXMLFiles = cms.vstring(
'Geometry/CMSCommonData/data/materials.xml',
5 'SimG4CMS/CherenkovAnalysis/data/singleDREAM.xml'),
6 rootNodeName = cms.string(
'singleDREAM:DREAM')