kamailio/lib/srdb2/schema/tuple_extensions.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE table PUBLIC "-//iptel.org//DTD DBSchema V1.0//EN"
  "http://iptel.org/dbschema/dtd/1.0/dbschema.dtd" [

<!ENTITY % entities SYSTEM "entities.xml">
%entities;

]>

<table role="presence">

  <name>tuple_extensions</name>

  <!-- related to the version of presence snapshot -->
  <version>5</version>
  <description>Extension elements published within tuples.</description>

  <!-- presentity ID -->
  <column id="tuple_notes.pres_id">
	<name>pres_id</name>
	<type>string</type>
	<size>64</size>
	<description>Presentity ID.</description>
  </column>

  <column id="tuple_notes.tupleid">
	<name>tupleid</name>
	<type>string</type>
	<size>64</size>
	<description>Tuple identification.</description>
  </column>

  <!-- serialized XML element -->
  <column>
	<name>element</name>
	<type>binary</type>
	<description>Whole extension element in serialized form.</description>
  </column>

  <!-- 0 if it is not status extension, nonzero otherwise -->
  <column>
	<name>status_extension</name>
	<type>int</type>
	<size>1</size>
	<description>
	  Flag set to nonzero if element is nested in &lt;status&gt;,
	  otherwise is extension element nested in &lt;tuple&gt;.
	</description>
  </column>
  
</table>