A unique value used by the device, along with the following
'xcmGenCodeIndexedStringCharSet', to identify this
charset-indexed string entry.
Usage: Conforming management agents SHALL NOT 'reuse' values of
'xcmGenCodeIndexedStringIndex' until its' 32-bit value wraps.
This prevents access to 'xcmGenCodeIndexedStringData' contents
via 'stale' pointers (previously cached from XCMI Job Monitoring
MIB or XCMI Resources MIB).
Note: Conforming management stations SHOULD interwork with
earlier (pre-XCMI 3.1) management agents which MAY 'reuse'
values of 'xcmGenCodeIndexedStringIndex'. By first reading the
pointer object in XCMI Job Monitoring MIB or XCMI Resources MIB,
the manager will avoid 'stale' pointer processing errors.