nltk.sem.drt.DRS

Class DRS

A Discourse Representation Structure.

Instance Methods

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__init__(self, refs, conds)
x.__init__(...) initializes x; see x.__class__.__doc__ for signature

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replace(self, variable, expression, replace_bound=False)
Replace all instances of variable v with expression E in self, where v is free in self.

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variables(self)
Return a set of all the variables that are available to be replaced.

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free(self, indvar_only=True)
Return a set of all the free (non-bound) variables in self.

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get_refs(self)

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simplify(self)

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toFol(self)

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__eq__(self, other)
Defines equality modulo alphabetic variance.

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str(self, syntax=1)

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Inherited from AbstractDrs: __add__, __and__, __call__, __gt__, __lt__, __neg__, __or__, applyto, draw, get_EqualityExpression, is_pronoun_function, make_VariableExpression, negate, tp_equals

Inherited from logic.Expression: __hash__, __repr__, __str__, substitute_bindings

Inherited from object: __delattr__, __getattribute__, __new__, __reduce__, __reduce_ex__, __setattr__

Inherited from drt_resolve_anaphora.DRS: resolve_anaphora

Properties

[hide private]

Inherited from object: __class__

init(self, refs, conds)
(Constructor)

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x.__init__(...) initializes x; see x.__class__.__doc__ for signature

Parameters:

refs - list of DrtVariableExpression for the discourse referents
conds - list of Expression for the conditions

Overrides: object.__init__

variables(self)

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Return a set of all the variables that are available to be replaced. This includes free (non-bound) variables as well as predicates.

Returns:: set of Variables
Overrides: logic.Expression.variables

See Also: logic.Expression.variables()

free(self, indvar_only=True)

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Return a set of all the free (non-bound) variables in self. Variables serving as predicates are no included.

Parameters:

indvar_only - boolean only return individual variables?

Returns:

set of Variables

Overrides: logic.Expression.free

See Also: logic.Expression.free()

eq(self, other)
(Equality operator)

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Defines equality modulo alphabetic variance. If we are comparing \x.M and \y.N, then check equality of M and N[x/y].

Overrides: logic.Expression.__eq__

Class DRS

__init__(self, refs, conds) (Constructor)

variables(self)

free(self, indvar_only=True)

__eq__(self, other) (Equality operator)

init(self, refs, conds)
(Constructor)

eq(self, other)
(Equality operator)