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11.2.21 Term Handling

?T =.. ?L   ISO

the functor and arguments of term T comprise the list L.

?X = ?Y   ISO

terms X and Y are unified.

+X \= +Y   ISO

terms X and Y no not unify.


X and Y are either strictly identical or do not unify.

acyclic_term(+T)   since release 4.3, ISO

term T is a finite (acyclic) term.

arg(+N,+T,-A)   ISO

the Nth argument of term T is A.

atom_chars(?A,?L)   ISO

A is the atom containing the character atoms in list L.

atom_codes(?A,?L)   ISO

A is the atom containing the characters in code list L.

atom_concat(?Atom1,?Atom2,?Atom12)   ISO

Atom Atom1 concatenated with Atom2 gives Atom12.

atom_length(+Atom,-Length)   ISO

Length is the number of characters of the atom Atom.

char_code(?Char,?Code)   ISO

Code is the character code of the one-char atom Char.

copy_term(+T,-C)   ISO

C is a copy of T in which all variables have been replaced by new variables.


C is a copy of T in which all variables have been replaced by new variables, and G is a goal for reinstating any attributes in C.


Mutable is a new mutable term with current value Datum.


X and Y are constrained to be different.


Goal is the conjunction of all goals blocked on some variable in Term.

functor(?T,?F,?N)   ISO

the principal functor of term T has name F and arity N.


The current value of the mutable term Mutable is Datum.

name(?A,?L)   deprecated

the code list of atom or number A is L.

number_chars(?N,?L)   ISO

N is the numeric representation of list of character atoms L.

number_codes(?N,?L)   ISO

N is the numeric representation of code list L.


number the variables in term T from M to N-1.

sub_atom(+Atom,?Before,?Length,?After,?SubAtom)   ISO

The characters of SubAtom form a sublist of the characters of Atom, such that the number of characters preceding SubAtom is Before, the number of characters after SubAtom is After, and the length of SubAtom is Length.

subsumes_term(General,Specific)   since release 4.3, ISO

Specific is an instance of General.

term_variables(+Term,-Variables)   since release 4.3, ISO

Variables is the set of variables that occur in Term, in first occurrence order.

unify_with_occurs_check(?X,?Y)   ISO

True if X and Y unify to a finite (acyclic) term.

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