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> I don't think you need to know the datatype to form the query - Here are two SQL queries for which the filter is expressed differently based on the type of the employee ID (empID) column. To match a numeric ID, you use the first query. To match a character string ID, you use the second: select emp_name from employee where empID = 200 select emp_name from employee where empID = '200' The type was stated when the table was created. To have a common API for LDAP and XML, you'll have to provide similar support for types. Extensible directory structures must be described with schemas, or some other mechanism for declaring types and constraints. You'll also need APIs to return type information. The LDAP API can return type information for LDAP attributes and use types when doing comparisons and sorts.
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