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__NAME__ purpose
string is a valid ISBN-10/ISBN-13 code
__END__
__NAME__ see also
__END__
__NAME__ description
Verification of the form field value succeeds if
the passed value is a valid &glos-ISBN;-10/ISBN-13 code.
</para>
<para>
The check can be advised to only accept ISBN-10 resp. ISBN-13 code.
__END__
__NAME__ notes
__END__
__NAME__ example: Verifying ISBN code
<programlisting>
FORM_FIELD_NAME=__FILENAME__ "Not a valid ISBN code"
</programlisting>
__END__
__NAME__ example: Verifying ISBN-13 code
<programlisting>
FORM_FIELD_NAME=__FILENAME__ 13 "Not a valid ISBN-13 code"
</programlisting>
__END__
__NAME__ example: Verifying ISBN-10 code
<programlisting>
FORM_FIELD_NAME=__FILENAME__ 10 "Not a valid ISBN-10 code"
</programlisting>
__END__
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