I am trying to write a gdml description of a detector sensitive to optical photons.  The materials have indices of refraction that depend on wavelength, for example.  When I look at the gdml output I see two issues:

1) When the matrices containing the properties are defined their names are just given by the type of the property, "RINDEX" for example for the index of refraction.  The problem is that all of the matrices have the same name.  I don't see how they could end up being associated with different materials.  See below:

<define>
    <matrix coldim="2" name="ABSLENGTH" values="1.90745e-06 2.54e+06 1.93725e-06 2.54e+06 1.968e-06 2.54e+06 1.99974e-06 2.54e+06 2.03253e-06 2.54e"/>
1.90745e-06 2.54e+06 1.93725e-06 2.54e+06 1.968e-06 2.54e+06 1.99974e-06 2.54e+06 2.03253e-06 2.54e
    <matrix coldim="2" name="RINDEX" values="1.90745e-06 1.55403 1.93725e-06 1.55557 1.968e-06 1.55698 1.99974e-06 1.55827 2.03253e-06 1.55945 2"/>
    <matrix coldim="2" name="ABSLENGTH" values="1.90745e-06 2.33615e+06 1.93725e-06 2.19567e+06 1.968e-06 2.06162e+06 1.99974e-06 1.93381e+06 2.032"/>
    <matrix coldim="2" name="RINDEX" values="1.90745e-06 1.45653 1.93725e-06 1.45681 1.968e-06 1.4571 1.99974e-06 1.4574 2.03253e-06 1.45771 2.0"/>
    <matrix coldim="2" name="ABSLENGTH" values="1.90745e-06 40 1.93725e-06 40 1.968e-06 40 1.99974e-06 40 2.03253e-06 40 2.0664e-06 40 2.10143e-06 "/>
    <matrix coldim="2" name="RINDEX" values="1.90745e-06 1 1.93725e-06 1 1.968e-06 1 1.99974e-06 1 2.03253e-06 1 2.0664e-06 1 2.10143e-06 1 2.13"/>

I suppose an easy fix would be to append the value of the pointer to the material properties vector to the name?

2)  The other issue is that the values string seems to be limited to 100 characters.  Therefore the entire matrix is not written out.