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Many languages provide support for describing composite and other user-defined types which in
turn depend upon built-in types. A built-in or primitive type is typically composed of a data
structure, a set of operations and a view or concrete external representation for that data
structure. User-defined types differ from primitive types in that they are typically composed of a
data structure and a set of operations only. This paper describes a view model which is an
integral part of an object-oriented development language named POOL (Persistent ObjectOriented Language). The language provides a facility for defining multiple and complex views of
a user-defined type as an integral part of a type definition. These view definitions are used to
enable values of user-defined types to be manipulated directly, for example, during marshalling
and input/output operations. This paper also addresses the view inheritance problem associated
with user-defined views, and also discusses a type inference strategy adopted for inferring types
from values of user-defined types.
M. Naeem, C. J. Harrison. (2008) A View Extension to an Object-Oriented Type System, Pakistan Journal of Engineering and Applied Sciences, Volume 2, Issue 1.
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