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1992-01-04
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FILE NAMES
==========
Every type of file is uniquely identified in the OzGIS system. This means that
the same name can be used for different types of files.
e.g. the attribute and geographics example files for australia are both called
"OZ".
This is accomplished by the use of different extensions, so the two australian
files are OZ.ATT and OZ.GEO
However, you NEVER use the extensions to the file names; the system adds them
automatically.
The only time you have to worry about extensions is when handling files
external to OzGIS e.g. backing up.
One important point is that external data files have to have names with
extensions ".DAT" before they can be read into the system (with OzEnter).
A standard interface is used to give file names. You usually just type in the
name (without extension) e.g. "PHRED". If the file is in another directory you
can put that on the front e.g. "\MYDATA\PHRED". Similarly, files can be on
other devices e.g. "A:PHRED" to read off a floppy.
The \OZGIS directory is used to hold "system" files. These can be selected by
typing "*" on the front of the file name. e.g. "*C16SV4" is the same as typing
"\OZGIS\C16SV4". System files include device files, marker files and font files
supplied with the system. You can of course put any files you use a lot into
the OZGIS directory too.
The file name interface has two other options. If you give the file name as "L"
(or "l"), a list of all that type of file in the current directory and also any
system files of that type, is generated.
You can also give the file name as"E" (or "e"), which exits from the procedure
back to the previous menu.