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<p><code>mod_pubsub</code> supports the following node configuration and publish options:</p>
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<ul>
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<li><ahref="https://xmpp.org/extensions/xep-0060.html#accessmodels"><code>pubsub#access_model</code></a>: controls who can access a node. Supported values are <code>open</code> and <code>presence</code>.</li>
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<li><code>pubsub#max_items</code>: controls how many published items are stored for later retrieval. It defaults to <code>max</code>, which stores all published items. A non-negative integer limits stored items for the node; when the limit is exceeded, the oldest stored item is removed. <code>0</code> allows publish notifications but does not persist items for later retrieval.</li>
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<li><code>pubsub#max_items</code>: controls how many published items are stored for later retrieval. It defaults to <code>max</code>, which stores all published items up to the server-wide <ahref="#modulesmod_pubsubmax_items_per_node"><code>max_items_per_node</code></a> limit. A non-negative integer limits stored items for the node; when the limit is exceeded, the oldest stored item is removed. <code>0</code> allows publish notifications but does not persist items for later retrieval.</li>
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</ul>
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<h3id="known-omissions-and-limitations">Known omissions and limitations<aclass="headerlink" href="#known-omissions-and-limitations" title="Permanent link">¶</a></h3>
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<p><code>mod_pubsub</code> is intended to grow over time, but it does not implement the full XEP-0060 feature set yet.
<p>Database backend used to store PEP nodes, subscriptions, and items.
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The <code>rdbms</code> backend requires a <code>default</code> RDBMS connection pool in <ahref="../../configuration/outgoing-connections/#rdbms-options"><code>outgoing_pools</code></a>.</p>
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