The parent node, price, has two child nodes, member and public. However, the Nodes argument specifies only member; therefore, only its value is output. Title, author, and year are siblings of price. The first document has multiple author and year siblings, so the values of those siblings are separated by the specified delimiter, semicolon (;).
|1||1||price||Carl Sagan;Ann Druyan||1980;1981||Cosmos||49.99|