User:Rich Farmbrough/ISBN/Template:Auto isbn
< User:Rich Farmbrough | ISBN
{{Rich Farmbrough/ISBN/Template:Auto isbn}} is called this way,
a. Suppose we have a 10 digit ISBN 0-593-01518-5
{{auto isbn|0|5|9|3|0|1|5|1|8|0-593-01518}}
b. Suppose we have a 13 digit ISBN 978-0-593-01518-6
{{auto isbn|0|5|9|3|0|1|5|1|8|0-593-01518}}
Up to 1 January 2007 this will display
ISBN 0-593-01518-5
Afterwards as
ISBN 978-0-593-01518-6
Clearly this would be tedious and error prone to do by hand so most uses of the template are expected to be set up by automated or semi-automated processes.
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