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# ->clear()
 -  clears all parameters
 -  clears all parameters
# ->get()
 -  returns the parameter value for the given key
 -  returns null if the key does not exist
 -  takes the default value as its second argument
 -  takes an optional namespace as its third argument
 -  can have the same key for several namespaces
# ->getNames()
 -  returns all key names for the default namespace
 -  takes a namepace as its first argument
# ->getNamespaces()
 -  returns all non empty namespaces
# ->setDefaultNamespace()
 -  sets the default namespace
 -  moves values from the old namespace to the new
 -  moves values from the old namespace to the new
 -  does not move old values to the new namespace if the second argument is false
 -  does not move old values to the new namespace if the second argument is false
# ->getAll()
 -  returns all parameters from the default namespace
# ->has()
 -  returns true if the key exists
 -  returns false if the key does not exist
 -  returns false if the key exists but in another namespace
 -  returns true if the key exists in the namespace given as its second argument
# ->hasNamespace()
 -  returns true for the default namespace
 -  returns true if the namespace exists
 -  returns false if the namespace does not exist
# ->remove()
 -  removes the key from parameters
 -  removes the key from parameters
 -  removes the key from parameters for a given namespace
 -  takes a namespace as its third argument
 -  takes a default value as its second argument
 -  removes the key from parameters
# ->removeNamespace()
 -  removes all keys and values from a namespace
 -  removes all keys and values from a namespace
 -  does not remove keys in other namepaces
 -  removes all keys and values from the default namespace by default
 -  removes all keys and values from the default namespace by default
 -  does not remove keys in other namepaces
 -  takes a namespace as its first parameter
 -  removes all the keys from parameters
# ->set()
 -  sets the value for a key
 -  sets the value for a key, not a reference
 -  takes a namespace as its third parameter
# ->setByRef()
 -  sets the value for a key
 -  sets the value for a key as a reference
 -  takes a namespace as its third parameter
# ->add()
 -  adds an array of parameters
 -  takes a namespace as its second argument
 -  adds an array of parameters, not a reference
# ->addByRef()
 -  adds an array of parameters
 -  takes a namespace as its second argument
 -  adds a reference of an array of parameters
# ->serialize() ->unserialize()
 - sfNamespacedParameterHolder implements the Serializable interface
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