Documentation for JIRA 4.0. Documentation for other versions of JIRA is available too. 
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The Issue Tab Panel plugin module allows you to add new tab panels to the View Issue screen.
You can add a new tab with a plugin, displaying information about a single issue (most likely pulled from an external source). This is how the Subversion and Perforce integration works.
Here is an example descriptor (from the Subversion plugin - source available):
<!--
The module class should implement
com.atlassian.jira.plugin.issuetabpanel.IssueTabPanel
-->
<issue-tabpanel key="subversion-commits-tabpanel" name="Subversion Changes Tab Panel"
class="com.atlassian.jira.plugin.ext.subversion.issuetabpanels.changes.SubversionRevisionsTabPanel">
<resource type="i18n" name="i18n" location="templates.plugins.subversion.issuetabpanels.subversion_jira_plugin"/>
<description>Show Subversion commits related to an issue in an issue tab panel.</description>
<label>Subversion Commits</label>
<resource type="velocity" name="view" location="templates/plugins/subversion/issuetabpanels/subversion-commits-view.vm"/>
</issue-tabpanel>