anchor.diff:  -----------------------------------------------------------
   // lets turn Object messages into XML then send to MQSeries
   from("activemq:My.Queue").
  -  marshal().xstream().
  +  marshal().json(JsonLibrary.XStream).
     to("mqseries:Another.Queue");
   -----------------------------------------------------------
   
  
positive.code:   to("mock:marshaled");
  ---------------------------------------------------------
  
  == XMLInputFactory and XMLOutputFactory
  
  http://xstream.codehaus.org/[The XStream library] uses the
  `javax.xml.stream.XMLInputFactory` and
  `javax.xml.stream.XMLOutputFactory`, you can control which
  implementation of this factory should be used.
  
  The Factory is discovered using this algorithm: 
   1. Use the `javax.xml.stream.XMLInputFactory` ,
  `javax.xml.stream.XMLOutputFactory` system property. 
   2. Use the `lib/xml.stream.properties` file in the `JRE_HOME`
  directory. 
   3. Use the Services API, if available, to determine the classname by
  looking in the `META-INF/services/javax.xml.stream.XMLInputFactory`,
  `META-INF/services/javax.xml.stream.XMLOutputFactory` files in jars
  available to the JRE. 
   4. Use the platform default XMLInputFactory,XMLOutputFactory instance.
  
  == How to set the XML encoding in Xstream DataFormat?
  
  You can set the encoding of XML in Xstream DataFormat
  by setting the Exchange's property with the key `Exchange.CHARSET_NAME`,
  or setting the encoding property on Xstream from DSL or Spring config.
  
  [source,java]
  -------------------------------
  from("activemq:My.Queue").
    marshal().xstream("UTF-8").
    to("mqseries:Another.Queue");
  -------------------------------
  
  == Setting the type permissions of Xstream DataFormat
  
  In Camel, one can always use its own processing step in the route to
  filter and block certain XML documents to be routed to the XStream's
  unmarhall step. You can set http://x-stream.github.io/security.html[XStream's type
  permissions] to automatically allow or deny the instantiation of certain
  types.
  
  The default type permissions setting used by Camel denies all types
  except for those from java.lang and java.util packages. This setting can
  be changed by setting System property
  org.apache.camel.xstream.permissions. Its value is a string of
  comma-separated permission terms, each representing a type being allowed
  or denied, depending on whether the term is prefixed with '+' (note '+'
  may be omitted) or with '-', respectively.
  
  Each term may contain a wildcard character '*'. For example, value
  "-*,java.lang.*,java.util.*" indicates denying all types except for
  java.lang.* and java.util.* classes. Setting this value to an empty
  string "" reverts to the default XStream's type permissions handling
  which denies certain blacklisted classes and allow others.
  
  The type permissions setting can be extended at an individual XStream
  DataFormat instance by setting its type permissions property.
  
  [source,java]
  -------------------------------------------------------------------
      <dataFormats>
          <xstream id="xstream-default" 
                   permissions="org.apache.camel.samples.xstream.*"/>
          ...
  
  -------------------------------------------------------------------
  
negative.code: 
  XStream is a Data Format which uses the
  http://xstream.codehaus.org/[XStream library] to marshal and unmarshal
  Java objects to and from JSon. However XStream was created primary for working
  with XML and therefore using JSon with XStream is not as popular as for example
  Jackson is for JSon.
  
  To use XStream in your camel routes you need to add the a dependency
  on *camel-xstream* which implements this data format.
  