<?xml version  =  "1.0"?>
<library  >
    <book   id  =  "1">
        <author  >
            <author-name  >author1</author-name  >
            <author-dob  >a date</author-dob  >
        </author  >
        <genre  >genre1</genre  >
    </book  >
    <book   id  =  "2">
        <author  >
            <author-name  >author2</author-name  >
            <author-dob  >a date2</author-dob  >
        </author  >
        <genre  >genre2</genre  >
    </book  >
    <book   id  =  "3">
        <author  >
            <author-name  >author3</author-name  >
            <author-dob  >a date3</author-dob  >
        </author  >
        <genre  >genre3</genre  >
    </book  >
</library  >