.. index:: single: json_graph_data_protocol
.. _json_graph_data_protocol/0:

.. rst-class:: right

**protocol**

``json_graph_data_protocol``
============================

Canonical JSON graph data protocol for object-backed graph sources and sinks using atom identifiers.

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

| **Author:** Paulo Moura
| **Version:** 1:0:0
| **Date:** 2026-07-03

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


| **Dependencies:**
|   (none)


| **Remarks:**
|    (none)

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

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

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

.. index:: graph/2
.. _json_graph_data_protocol/0::graph/2:

``graph/2``
^^^^^^^^^^^

Enumerates or stores graph properties for an atom graph identifier.

| **Compilation flags:**
|    ``dynamic``

| **Template:**
|    ``graph(GraphId,Properties)``
| **Mode and number of proofs:**
|    ``graph(?atom,?list)`` - ``zero_or_more``


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

.. index:: node/3
.. _json_graph_data_protocol/0::node/3:

``node/3``
^^^^^^^^^^

Enumerates or stores node properties for atom graph and node identifiers.

| **Compilation flags:**
|    ``dynamic``

| **Template:**
|    ``node(GraphId,NodeId,Properties)``
| **Mode and number of proofs:**
|    ``node(?atom,?atom,?list)`` - ``zero_or_more``


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

.. index:: edge/5
.. _json_graph_data_protocol/0::edge/5:

``edge/5``
^^^^^^^^^^

Enumerates or stores edge properties for atom graph, edge, source node, and target node identifiers.

| **Compilation flags:**
|    ``dynamic``

| **Template:**
|    ``edge(GraphId,EdgeId,Source,Target,Properties)``
| **Mode and number of proofs:**
|    ``edge(?atom,?atom,?atom,?atom,?list)`` - ``zero_or_more``


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

.. index:: hyperedge/4
.. _json_graph_data_protocol/0::hyperedge/4:

``hyperedge/4``
^^^^^^^^^^^^^^^

Enumerates or stores undirected hyperedge properties for atom graph and hyperedge identifiers and a list of atom node identifiers.

| **Compilation flags:**
|    ``dynamic``

| **Template:**
|    ``hyperedge(GraphId,HyperedgeId,Nodes,Properties)``
| **Mode and number of proofs:**
|    ``hyperedge(?atom,?atom,?list(atom),?list)`` - ``zero_or_more``


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

.. index:: hyperedge/5
.. _json_graph_data_protocol/0::hyperedge/5:

``hyperedge/5``
^^^^^^^^^^^^^^^

Enumerates or stores directed hyperedge properties for atom graph and hyperedge identifiers and lists of atom source and target node identifiers.

| **Compilation flags:**
|    ``dynamic``

| **Template:**
|    ``hyperedge(GraphId,HyperedgeId,Sources,Targets,Properties)``
| **Mode and number of proofs:**
|    ``hyperedge(?atom,?atom,?list(atom),?list(atom),?list)`` - ``zero_or_more``


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

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

(none)

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

(none)

Operators
---------

(none)