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Field 1:
Name Field
(8
bytes)
contains
the
last
qualified
name
of the data set identified by this entry.
resides on the volumes whose serial numters
are
given
in
control block pointed to by field 2.
name
of
the
The data set
the
volurre
Field 2:
Address Field .(3 bytes) -- contains the relative track address
of
the volume control block identifying the volumes containing the data
set named in field 1.
The address is in the form
~TR.
Field 3:
Half-word count (1 byte)
that one half word follows.
contains a binary one to
indicate
Field 4:
Zero Field (2 bytes) -- contains binary zeros.
A control volume pointer entry can appear only in volume indexes.
It
is 18 bytes long and contains four fields.
Field
1:
Name Field (8 bytes) -- contains a high level index name that
appears in the volume index of the control volume identified in field 4.
Field 2:
Address Field (3 bytes) -- contains binary zeros.
Field 3:
Half-word count
(1
byte)
indicate that three half words follow.
contains
a
binary
three
to
Field
4:
Control Volmne Serial Number (6 bytes) -- contains the serial
number of the control
volume
whose
volume
index
contains
an
entry
identifying the high level index name in field 1.
An
alias entry can appear in voluITe indexes only.
An alias entry is
20 bytes long and contains four fields.
Field 1:
Name Field (8 bytes) -- contains the alias of the
high
level
index identified in field 2.
Field 2:
Address Field (3 bytes) -- contains the relative track address
of the first block of the index named in field 4.
The address is in the
form TTR.
Field 3:
Half-word Count (1 byte) -- contains a binary four to indicate
that four half words follow.
Field
4:
True
Name Field (8 bytes) -- contains the name of the index
whose alias appears in field 1.
The address of the index is in field 2.
A generation index pointer entry can appear
in
all
indexes
except
generation indexes.
The entry is 16 bytes long and contains six fields.
Field
1:
Name
Field (8 'bytes) -- contains the name of the generation
index whose address is contained in field 2.
Field 2:
Address Field (3 bytes) -- contains the relative track address
of the generation index named in field 1.
The address is
in
the
form
TTR.
Field
3:
Half-word Count (1 byte) -- contains a binary two to indicate
that two half words follow.
Field 4:
Flags (1 byte) -- contains flags that govern the
uncataloging
of
data
sets as specified by the DELETE and EMPTY options of the INDEX
macro-instruction.
The options
and
their
hexadecimal
codes
are
as
follows:
Maintaining the Catalog and the Volume Table of Contents
27
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