Page History

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The ISBN modulus 11 (used for 

Gloss
t UK NHS

 number) picks up more errors than the IBM checksum. Leaving 2% to 3% of errors undetected. However, it generates a check-sum value of 0 to 10 and thus cannot be represented as a single

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t check-digit

 in about 9% of cases. The ISBN convention is to use "X" to represent the

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t check-digit

 value 10 but this is incompatible with an integer

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RefType (data type) t Integer

 representation. The

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t UK NHS

 number uses this check-sum but regards and number generating a check-sum of 10 as an invalid identifier. This approach could be applied to the 

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t SCTID

 but this would render 9% of possible values unusable in each partition and

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t namespace

. This would prevent a simple sequence of values from being allocated as the item identifier within any

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t namespace

. More significantly the unusable item identifier would differ in each 

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t namespace

 or partition and this would prevent simple transpositions of item identifiers between partitions and 

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t namespaces

.

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