Thanks for your response.
[QUOTE=kiwidude;1546108]The problem is that any value I applied could only be temporary and would not survive a calibre restart. QUOTE]
If the plugin created and used a 2nd column called ISBN Output. The output from the isbn extractor "show details " could be posted to the new column.
ISDN matched
ISBN not Found
ISBN Number result
In otherwords the results from the plugin would be posted to a new field in the database as well as to the ISBN field.
Then the results would be permanent in the DB and would survive a restart.
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