The catalogues in DIRA2 are organized in tables of data. The
files on tape are arranged on "ANSI Labelled Magnetic Tape " The
catalogues on disk are formatted ASCII files.
The records of a catalogue must have the same length on Unix systems,
while can be of variable or fixed length form on VAX/VMS machines; the
latter form is strongly recommended. On the VAX/VMS systems the users
can transform catalogues from variable record structure to fixed length
structure and vice versa by DB_FIXA and DB_UNFIX commands.
Properties of the DIRA2 catalogues are:
- Each record of a catalogue contains the information about
an object, in fields of defined length.
- It is not possible to use more than one record for the same
- The maximum allowed length for a record is 2880 characters.
- The maximum allowed number of fields in a catalogue record is 512.
- Non homogeneous records within tables (e.g., a title, labels ) do
not exist in a catalogue.
- The record fields can contain integer numbers, floating point numbers or a
string of characters. When there are floating point numbers, the
decimal point must be explicitly expressed.
- The maximum allowed size of a field is 128 characters.
- No restriction exists for field formats except coordinates,
that must be defined in a single field.
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