The function getAttrOrDefault(xml::Element e, xml::XmlChar attr_name, T default_value)
will return the attribute converted to to type T but if it is not found it will return
default_value. When building new detectors supplying this is useful for
supplying default attribute values.

Improve the CMS example. Add word for the raw generator status of generator particles to Geant4Particle

Improve the CMS example. Add word for the raw generator status of generator particles to Geant4Particle

Improve the CMS example. Add word for the raw generator status of generator particles to Geant4Particle

modified:   include/DDRec/CellIDPositionConverter.h
modified:   src/CellIDPositionConverter.cpp