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object --+ | CustomFeatureValue
An abstract base class for base values that define a custom
unification method. A CustomFeatureValue
's custom
unification method will be used during feature structure unification
if:
CustomFeatureValue
is unified with another base
value.
CustomFeatureValue
is not the value of a customized
Feature
(which defines its own unification method).
If two CustomFeatureValue
objects are unified with one
another during feature structure unification, then the unified base
values they return must be equal; otherwise, an
AssertionError
will be raised.
Subclasses must define unify() and __cmp__(). Subclasses may also wish to define __hash__().
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Inherited from |
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Inherited from |
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If this base value unifies with |
hash(x)
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