Fixing examples pipeline due to changes in GDML material files

[jgalan]

[jgalan]

Hi @lobis, what we could do with the 3 reference examples? Not sure how to proceed now.

[lobis]

Hi @lobis, what we could do with the 3 reference examples? Not sure how to proceed now.

I think we need to also include the materials.xml in the geometry.

instead of

<!DOCTYPE gdml [
        <!ENTITY geometry SYSTEM "geometry.gdml">
        <!ENTITY materials SYSTEM "https://sultan.unizar.es/materials/gases.xml">
        ]>

do something like

<!DOCTYPE gdml [
        <!ENTITY geometry SYSTEM "geometry.gdml">
        <!ENTITY materials SYSTEM "https://sultan.unizar.es/materials/materials.xml">
        <!ENTITY gases SYSTEM "https://sultan.unizar.es/materials/gases.xml">
        ]>

and dereference them appropriately (&gases, &materials).

Looks like this is not needed for the latest Geant4 versions but if we want to keep compatiblity with older version we may need to do this.