.. index:: single: transaction_dataset_protocol
.. _transaction_dataset_protocol/0:

.. rst-class:: right

**protocol**

``transaction_dataset_protocol``
================================

Protocol for transaction datasets used with frequent itemset mining algorithms. Transaction identifiers are expected to be unique within a dataset.

| **Availability:** 
|    ``logtalk_load(frequent_pattern_mining_protocols(loader))``

| **Author:** Paulo Moura
| **Version:** 1:0:0
| **Date:** 2026-04-29

| **Compilation flags:**
|    ``static``


| **Dependencies:**
|   (none)


| **Remarks:**
|    (none)

| **Inherited public predicates:**
|    (none)

.. contents::
   :local:
   :backlinks: top

Public predicates
-----------------

.. index:: items/1
.. _transaction_dataset_protocol/0::items/1:

``items/1``
^^^^^^^^^^^

Returns the declared transaction item domain as a canonical sorted list of unique items.

| **Compilation flags:**
|    ``static``

| **Template:**
|    ``items(Items)``
| **Mode and number of proofs:**
|    ``items(-list(atom))`` - ``one``


------------

.. index:: transaction/2
.. _transaction_dataset_protocol/0::transaction/2:

``transaction/2``
^^^^^^^^^^^^^^^^^

Enumerates by backtracking the transactions in the dataset. The transaction identifier is expected to be unique within the dataset. Each transaction is represented as a canonical sorted list of unique declared items.

| **Compilation flags:**
|    ``static``

| **Template:**
|    ``transaction(Id,Transaction)``
| **Mode and number of proofs:**
|    ``transaction(-integer,-list(atom))`` - ``zero_or_more``


------------

Protected predicates
--------------------

(none)

Private predicates
------------------

(none)

Operators
---------

(none)