> ## Documentation Index
> Fetch the complete documentation index at: https://docs.aseeflow.org/llms.txt
> Use this file to discover all available pages before exploring further.

# Extension Attributes

The following attributes are extension attributes for the `camunda` namespace `http://camunda.org/schema/1.0/dmn`.

## historyTimeToLive

<table class="table table-striped">
  <tr> <th>Description</th> <td> The attribute specifies the history time to live (in days) for the decision definition. It is used within [History cleanup](/user-guide/process-engine/history/history-cleanup). </td> </tr>
  <tr> <th>Type</th> <td><code>java.lang.Integer or java.lang.String</code></td> </tr>
  <tr> <th>Possible Values</th> <td> Any non-negative integer number or string containing a time in days defined by the ISO-8601 date format. </td> </tr>
  <tr> <th>Default Value</th> <td>null - means that decision definition history won't ever be removed during history cleanup run</td> </tr>
  <tr> <th>DMN 1.3 Elements</th> <td> Decision </td> </tr>
</table>

## inputVariable

<table class="table table-striped">
  <tr> <th>Description</th> <td> This attribute specifies the variable name which can be used to access the result of the input expression in an input entry expression. </td> </tr>
  <tr> <th>Type</th> <td><code>java.lang.String</code></td> </tr>
  <tr> <th>Possible Values</th> <td> The name of the variable as <code>java.lang.String</code>. </td> </tr>
  <tr> <th>Default Value</th> <td><code>cellInput</code></td> </tr>
  <tr> <th>DMN 1.3 Elements</th> <td> [Input](/reference/dmn/decision-table/input) </td> </tr>
</table>

## versionTag

<table class="table table-striped">
  <tr> <th>Description</th> <td> <p> The attribute specifies a version tag for the decision definition. </p> </td> </tr>
  <tr> <th>Type</th> <td><code>java.lang.String</code></td> </tr>
  <tr> <th>Possible Values</th> <td> Any value that has a meaning as version tag for the decision definition. <strong>Note:</strong> Sorting by versionTag is string based. The version will not be interpreted. As an example, the sorting could return v0.1.0, v0.10.0, v0.2.0. </td> </tr>
  <tr> <th>Default Value</th> <td>–</td> </tr>
  <tr> <th>DMN 1.3 Elements</th> <td> Decision </td> </tr>
</table>