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The T or Translate option is a database-level
indexing option that applies a custom translation table
to all Omnidex indexes in the installation that do not have
the ;NT (No Translate) option installed on them.
The ;NT (No Translate) prevents indexed values from being
upshifted. When excluding words
for No Translate indexes, it will be necessary to include
the different case sensitive spellings of the excluded word.
For example, if “CO” is an excluded word, the
keyword “Co” is still indexed for any No Translate
indexes unless "Co" is included in the excluded
words list.
Because the translation table affects the contents of the
Omnidex indexes, the translation table should be loaded before
building the indexes. Otherwise, the indexes will have to
be rebuilt after the translation table is loaded.
Creating a Translation Table
To create a translation table, create an ASCII text file
with 255 lines, one for each character in the ASCII collating
sequence.
- For each character to be translated to a different ASCII
counterpart, place the desired ASCII character in column
1 of the line that corresponds to the 8-bit character's
position in the collating sequence.
- To leave a character untranslated, enter a backslash (
\ ). A backslash ( \ ) in a line means the corresponding
character is not translated at all, even if it is an 8-bit
character or in lower case. Therefore, a character cannot
be redefined to be blank or a backslash.
- To use the default translation for that character, leave
the line blank.
- The first 32 ASCII characters, which are control codes,
cannot be redefined. They are translated to blanks regardless
of what is specified in lines 1 through 32 of the translation
table.
- Although some characters may represent the combination
of two letters, note that they can only be translated to
one ASCII character. Thus “ß” (the German
equivalent of “ss” or “sz”) can
only be “s” or “z” but not “ss”
or “sz”.
- The translation of these characters cannot be overriden.
For example, the Greek8 letter “F”, which Omnidex
translates as a Roman “O” (upper case) by default,
occupies position 214 in the ASCII collating sequence. To
define “F” as a Roman “F”, type the
ASCII character F in column 1 of line 214. To translate the
lower case “phi”( f )to “f”, type
an f on the appropriate line in collating sequence (here,
line 230). Lines 211 through 230 of the translation table
might look like this.
.
.
211
212
213
214 F
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230 f
.
.
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Recommendation
DISC recommends that the following special characters NOT
be redefined:
+ (plus)
, (comma)
- (minus)
: (colon)
* (asterisk)
? (question mark)
$ (dollar sign)
& (ampersand)
^ (carat)
< (less than)
> (greater than)
= (equal)
These characters are used internally by Omnidex for Boolean
operators, ranges, wild cards, and so on.
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Loading a Translation Table
To load the translation table, enter T at the Cmd: prompt.
DBINSTAL will prompt for the file that contains the translation
table. The sample listing below shows how to use the TRANSLATE
command to load a translation table named “ttable”:
Cmd: T
Translation table file: ttable
Table updated
To restore the translation table to defaults, create a blank
file of 255 lines, and load it using the TRANSLATE command
as shown above, or reinstall the Omnidex indexes without specifying
a translation table.
The translation table must be reloaded for an Omnidex environment
whenever the Omnidex indexes are reinstalled on the tables
in the environment catalog. Also, the indexes must be reloaded
after loading a new translation table.
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