<table_A field1="value" field2="value" pkField1="value" pkField2="value">
  <table_B field1="value" field2="value" pkField3="value" />
  <table_B field1="value" field2="value" pkField3="otherValue" timeField="+5 minutes"/>
</table_A>

<table_a ...>
  <table_b ... />
  <table_b ... />
  <table_b ... />
  <table_c ... />
  <table_c ... />
  <table_d ...>
    <table_e ...>
      <table_f ...>
        <table_g ... />
        <table_g ... />
        <table_h ...>
          <table_i ... />
          <table_i ... />
        </table_h>
      </table_f>
    </table_e>
  </table_d>
</table_a>