ension point by name:

<pre class="prettyprint">
	IExtensionPoint listeners = host.GetExtensionPoint( "DataPointProviders" );</pre>

<h4>Interface</h4>
<p>The extension object passed to Install must implement either the
   <b>IDataPointProvider</b> or the <b>IDataPointProvider2</b> interface:

<pre class="prettyprint">
	public interface IDataPointProvider
	{
		bool HasDataFor( ParameterInfo parameter );
		IEnumerable GetDataFor( ParameterInfo parameter );
	}

	public interface IDataPointProvider2 : IDatapoi