If you're trying to have the summary be three paragraphs, you should use the `<para>` tag http://msdn.microsoft.com/en-us/library/x640hcd2(v=vs.110).aspx. New lines are ignored in XML.

Example:

```
<summary>
<para>
Paragraph 1
</para>
<para>
Paragraph 2
</para>
</summary>
```