Wrong 1284DeviceID attribute in hpcups for DeskJet 990C

[Tim Waugh]

hpcups.drv.in has this:

    {
      ModelName "HP Deskjet 990c"
      Attribute "NickName" "" "HP Deskjet 990c, $Version"
      Attribute "ShortNickName" "" "HP Deskjet 990c"
      Attribute "1284DeviceID" "" "MFG:HP;MDL:deskjet 990c;DES:deskjet 990c;"
      PCFileName "hp-deskjet_990c.ppd"
      Attribute "Product" "" "(HP Deskjet 990cxi Printer)"
      Attribute "Product" "" "(HP Deskjet 990cse Printer)"
      Attribute "Product" "" "(HP Deskjet 990cm Printer)"
      Attribute "Product" "" "(HP Deskjet 990c Printer)"
    }

But the actual device gives this Device ID:

MFG:HEWLETT-PACKARD;MDL:DESKJET 990C;DES:Hewlett-Packard DeskJet 990C;
(other fields removed)

This causes problems when trying to decide automatically which PPD to use for a given device.

How many of the device IDs in hpcups.drv are accurate and match what the device will say, and how many are just human-readable descriptions of the devices?