016+ <books>
016- <books><book><title>The Grapes of Wrath</title><author>John Steinbeck</author></book><book><title>The Pearl</title><author>John Steinbeck</author></book></books>
017+ <book>
018+ <title>The Grapes of Wrath</title>
019+ <author>John Steinbeck</author>
020+ </book>
021+ <book>
022+ <title>The Pearl</title>
023+ <author>John Steinbeck</author>
024+ </book>
025+ </books>