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2 changes: 1 addition & 1 deletion schemas/digitalIdentifier/ISBN.schema.tpl.json
Original file line number Diff line number Diff line change
Expand Up @@ -9,7 +9,7 @@
"properties": {
"identifier": {
"type": "string",
"pattern": "^([0-9]{3}-|)[0-9]{1}-[0-9]{3}-[0-9]{5}-[0-9]{1}$",
"pattern": "^([0-9]{3}-)?[0-9]{1}-[0-9]{3}-[0-9]{5}-[0-9]{1}|[0-9]{1}-[0-9]{2}-[0-9]{6}-[0-9]{1}$",
"_instruction": "Enter the numeric commercial book identifier 'International Standard Book Number' (ISBN) following the defined pattern (e.g., 123-4-567-89012-3 (13-digit ISBN) or 4-567-89012-3 (10-digit ISBN))."
}
}
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