
so on. These are all attributes associated, by definition, with market identifiers, as
described below.
Another major problem that data users encounter is the lack of a concordance between
coding schemes. The International Securities Identification Number (ISIN) goes a fair
way to addressing this problem, but does have its own limitations. For example, it is
quite common to find that newly issued clearing numbers are not reflected in ISIN num-
bers on a sufficiently timely basis. As a result, processing tends to continue to be based
on the original clearing number independently. Worse, expired and/or deleted identi-
fiers have a tendency to not be pur ...