Read a file /tmp/in.xml into YCP map:
 map config	= (map)SCR::Read (.anyxml, "/tmp/in.xml")
 Using the agent this way, these default options of XML::Simple library
 will be used for reading:
	ForceContent	=> 1
	ForceArray	=> 1
	KeepRoot	=> 1,
	KeyAttr		=> [],
 Find the description of these arguments in the XML::Simple documentaion.
 For example, ForceArray set to 1 "forces nested elements to be represented
 as arrays even when there is only one".
 Alternative way of reading is using the argument map. This way it is
 possible to specify non-default read options in the "args" submap:
 map config	= (map)SCR::Read (.anyxml, $[
	"file"  : "/tmp/in.xml",
	"args"	: $[
		"ForceArray"	: 0,
		"KeepRoot"	: 1
	]
 ])
 Writing with the default options:
 Write (.anyxml, $[
	"file"  : "/tmp/config.xml",
	"xml"   : config,
 ])
 Non-default write options could be used by passing extra submap with
 "args" key in the write map:
 Write (.anyxml, $[
	"file"	: "c.xml",
	"xml"	: config,
	"args	: $[
		"XMLDecl"	: <?xml version="123456789"?>,
		"RootName"	: "test"
	]
 ]);