See Chapter 5. Resource Loading.

For example:

@Inject
@Resource("WEB-INF/beans.xml")
URL beansXml;

or

@Inject
@Resource("WEB-INF/web.xml")
Collection<InputStream> webXmls;

OpenOn should open the corresponding resource which is to be injected.

See http://docs.jboss.org/seam/3/solder/latest/reference/en-US/html/resourceloading.html