An opaque data type is a user-defined data type that is fully encapsulated. That is, its internal structure is unknown to the database server. User-defined types (UDTs) that are not DISTINCT types whose source types are built-in types are opaque.
The built-in data types BLOB, BOOLEAN, CLOB, and LVARCHAR are implemented as opaque data types. You cannot access these built-in opaque data types in cross-server distributed operations, but you can access them in other databases of the same Dynamic Server instance.
For more information, see the section Opaque (IDS). See also IBM Informix: User-Defined Routines and Data Types Developer's Guide.
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