|Message: Are slashes allowed in volume names in GDML?||Not Logged In (login)|
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I am attempting to add GDML support to an existing application with a C++-generated geometry. The application uses a variety of factory classes with associated G4UImessengers to build the geometry with user-configurable parameters.
To simplify the coding, I re-use the factories' name string for both the Messenger path and for the volume names. In several cases, these names include slashes ("/") to provide both a G4UIcommand hierarchy and a human-readable volume hierarchy.
I was able to successfully export my entire geometry to a GDML file, but on readback, the GDML parser generates warning messages for all of the volume names containing slashes, and fails to construct the geometry:
G4GDML: Reading 'snolab+fridge.gdml'... G4GDML: VALIDATION ERROR! value 'Shield/MuMetalShield0xd641c00' is invalid NCName at line: 381 G4GDML: VALIDATION ERROR! value 'Shield/MuMetalShield0xd641e10' is invalid NCName at line: 386 G4GDML: VALIDATION ERROR! value 'Shield/MuMetalShield0xd641c00' is invalid NCName at line: 387 [...] G4GDML: VALIDATION ERROR! value 'Fridge/layer40xd65a0c0' is invalid NCName at line: 4452 G4GDML: VALIDATION ERROR! value 'Fridge/layer50xd65c670' is invalid NCName at line: 4456 G4GDML: Reading definitions... G4GDML: Reading materials... [...]
The visualization comes up empty. I believe this is a shortcoming of the GDML schema, since the volume name strings are apparently entirely acceptable within the GEANT4 application.
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