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\page ExampleG04 Example G04
## GDML DETECTOR SENSITIVITY
This example demonstrates the usage of the GDML auxiliary information for
associating a sensitive detector to a volume.
The detector construction consists of a call to GDMLProcessor which parses a
GDML file and returns the pointer to the world volume. The user can also write
her/his own GDML file and use it as the primary input format for her/his Geant4
application.
A simple GDML files is provided:
- auxiliary.gdml, showing association of a volume with the auxiliary
information, related to the sensitive detector.
## HOW TO BUILD THE EXAMPLE ?
- You need to have built the persistency/gdml module by having
set the `-DGEANT4_USE_GDML=ON` flag during the CMAKE configuration step,
as well as the `-DXERCESC_ROOT_DIR=path_to_xercesc` flag pointing to
the path where the XercesC XML parser package is installed in your system.
- Compile and link to generate the executable (in your CMAKE build directory):
```
% make
```
- Execute the application for parsing interactively the GDML file:
```
% ./gdml_det auxiliary.gdml
```