Abstract class

abstract cl-ss

in object-oriented programming, a cl-ss designed only as a parent from which sub-cl-sses may be derived, but which is not itself suitable for instantiation. often used to “abstract out” incomplete sets of features which may then be shared by a group of sibling sub-cl-sses which add different variations of the missing pieces.
historical examples

now the mere fact of proceeding thus is equivalent to setting up the concept as a symbol of an abstract cl-ss.
a new philosophy: henri bergson edouard le roy

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