Newer device classes not documented

[Johannes Meixner]

Traditional HPLIP device classes are properly documeted at
http://hplipopensource.com/hplip-web/tech_docs/device_classes.html

But newer HPLIP device classes are not documented there.

Examples

http://hplipopensource.com/hplip-web/models/deskjet_aio/deskjet_2510_series.html
"APDK device class(es): PyramidPlus"

http://hplipopensource.com/hplip-web/models/officejet/officejet_pro_8500_a910.html
"APDK device class(es): Corbett"

The HPLIP source file data/models/models.dat lists a lot of
newer HPLIP device classes ("tech-class") where no proper
documentation is public available.

Missing public HPLIP device classes documentation is a bug
from my point of view because without proper HPLIP device
classes documentation it is in practice impossible for others
to really help HPLIP users when they have issues that might
depend on the particular printer device model.

If HP does not provide public accessible proper HPLIP
device classes documentation at least I could no longer
help in any way HPLIP users with any HPLIP issue if the
user's particular printer device model belongs to an
undocumented device class.

The basic reason is that I must know if a user's device
behaves like a regular PCL or PostScript printer or
if the device could have arbitrary special behaviour
that nobody can reproduce except those who also
have exactly that particular device.