+STR
+DOC
+MAP
=VAL :a
=VAL "double quotes
=VAL :b
=VAL :plain value
=VAL :c
=VAL :d
+SEQ
=VAL :seq1
-SEQ
+SEQ
=VAL :seq2
-SEQ
=VAL :e
+SEQ &node
+MAP
=VAL :x
=VAL :y
-MAP
-SEQ
=VAL :block
=VAL >abcde\n
-MAP
-DOC
-STR