Visual DataFlex Web Service for testing ISBN Numbers

Visual DataFlex Web Service to validate ISBN numbers.

The following operations are available. For a formal definition, please review the Service Description.-
**IsValidISBN13**

The test is done by calculation on the first 12 digits and compare the result with the checksum number at the end. You have to pass a 13 digits number. -
**IsValidISBN10**

The test is done by calculation on the first 9 digits and compare the result with the checksum number at the end. You have to pass a 10 digits number or 8 digits and an X.