- Deprecated org.restlet.Component XML configuration.
	Usage of XML support in Spring extension is recommended instead.
      - Deprecated e4 extension.
	Usage of Guice or Spring extensions is recommended instead.
      - Deprecated JDBC extension.
	Use a persistence technology such as Mybatis or Hibernate instead.
      - Deprecated JiBX and XStream extensions.
        Use an XML serialization technology such as Jackson instead.
      - Deprecated jSSLUtils, ROME, XDB extensions.
	Libraries not actively developed anymore.
      - Deprecated Apache HTTP Client and Simple extensions.
        Will be removed to favor lower-level network extensions such as
        Jetty and Netty, allowing more control at the Restlet API level.
      - Deprecated SIP, WebDAV extensions.
	Will be removed to focus on Web APIs.