4 You can represent the empty sequence
5 with an empty inline sequence.
9 array('empty' => array())
13 You can represent the empty mapping
14 with an empty inline mapping.
18 array('empty' => array())
20 test: Empty Sequence as Entire Document
26 test: Empty Mapping as Entire Document
32 test: Null as Document
40 You can represent an empty string
41 with a pair of quotes.