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

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE visualization SYSTEM "../../visualization.dtd">
<visualization name="Example" embeddable="false">
    <description>This is a developer example which demonstrates how to implement and configure a basic d3-based plugin for charts.</description>
    <data_sources>
        <data_source>
            <model_class>HistoryDatasetAssociation</model_class>
            <test type="isinstance" test_attr="datatype" result_type="datatype">tabular.Tabular</test>
            <test type="isinstance" test_attr="datatype" result_type="datatype">tabular.CSV</test>
            <to_param param_attr="id">dataset_id</to_param>
        </data_source>
    </data_sources>
    <params>
        <param type="dataset" var_name_in_template="hda" required="true">dataset_id</param>
    </params>
    <entry_point entry_point_type="chart" src="script.js"/>
    <settings>
        <input>
            <name>data_dialog</name>
            <label>Some data selector</label>
            <type>data_dialog</type>
            <multiple>false</multiple>
        </input>
    </settings>
    <groups>
        <input>
            <name>x</name>
            <label>Bubble x-position</label>
            <type>data_column</type>
            <is_numeric>true</is_numeric>
        </input>
        <input>
            <name>y</name>
            <label>Bubbles y-position</label>
            <type>data_column</type>
            <is_numeric>true</is_numeric>
        </input>
        <input>
            <name>z</name>
            <label>Bubble size</label>
            <type>data_column</type>
            <is_numeric>true</is_numeric>
        </input>
    </groups>
</visualization>