galaxy/config/plugins/visualizations/example/static/example.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE visualization SYSTEM "../../visualization.dtd">
<visualization name="Minimal Example" hidden="true">
    <description>Welcome to the Minimal Visualization Plugin</description>
    <data_sources>
        <data_source>
            <model_class>HistoryDatasetAssociation</model_class>
            <test test_attr="ext">tabular</test>
        </data_source>
    </data_sources>
    <params>
        <param required="true">dataset_id</param>
    </params>
    <entry_point entry_point_type="script" src="script.js" />
    <settings>
        <input>
            <name>setting_input</name>
            <help>setting help</help>
            <type>setting_type</type>
        </input>
    </settings>
    <tracks>
        <input>
            <name>track_input</name>
            <help>track help</help>
            <type>track_type</type>
        </input>
    </tracks>
    <specs>
        <spec_name>spec_value</spec_name>
    </specs>
    <tests>
        <test>
            <param name="dataset_id" value="http://cdn.jsdelivr.net/gh/galaxyproject/galaxy-test-data/1.tabular" ftype="tabular" />
        </test>
    </tests>
    <help format="markdown"><![CDATA[
Learn more at:
[https://charts.galaxyproject.org](https://charts.galaxyproject.org)
    ]]></help>
</visualization>