Parsed ARRAY looks like this:
array(1) {
  ["spies"]=>
  array(1) {
    ["spy"]=>
    array(4) {
      [0]=>
      array(4) {
        ["name"]=>
        string(10) "James Bond"
        ["email"]=>
        string(13) "mi5@london.uk"
        ["address"]=>
        string(26) "Wherever he is needed most"
        ["_attributes"]=>
        array(2) {
          ["id"]=>
          string(3) "007"
          ["type"]=>
          string(8) "SuperSpy"
        }
      }
      [1]=>
      array(4) {
        ["name"]=>
        string(8) "Number 6"
        ["email"]=>
        array(2) {
          ["_attributes"]=>
          array(2) {
            ["type"]=>
            string(7) "private"
            ["location"]=>
            string(6) "office"
          }
          ["_content"]=>
          string(13) "mi6@london.uk"
        }
        ["address"]=>
        string(22) "123 Island Prison Lane"
        ["_attributes"]=>
        array(2) {
          ["id"]=>
          string(1) "6"
          ["type"]=>
          string(10) "RetiredSpy"
        }
      }
      ["_num"]=>
      int(3)
      [2]=>
      array(4) {
        ["name"]=>
        string(16) "Inspector Gadget"
        ["email"]=>
        string(12) "lost@aol.com"
        ["friends"]=>
        array(1) {
          ["friend"]=>
          array(3) {
            [0]=>
            array(3) {
              ["name"]=>
              array(2) {
                ["first"]=>
                string(6) "little"
                ["last"]=>
                string(4) "girl"
              }
              ["age"]=>
              string(2) "12"
              ["hair"]=>
              array(1) {
                ["_attributes"]=>
                array(2) {
                  ["color"]=>
                  string(5) "brown"
                  ["length"]=>
                  string(4) "long"
                }
              }
            }
            [1]=>
            array(3) {
              ["name"]=>
              array(2) {
                ["first"]=>
                string(6) "smelly"
                ["last"]=>
                string(3) "dog"
              }
              ["age"]=>
              string(2) "14"
              ["hair"]=>
              array(1) {
                ["_attributes"]=>
                array(2) {
                  ["color"]=>
                  string(12) "dirtry blond"
                  ["length"]=>
                  string(5) "short"
                }
              }
            }
            ["_num"]=>
            int(2)
          }
        }
        ["_attributes"]=>
        array(2) {
          ["id"]=>
          string(2) "13"
          ["type"]=>
          string(13) "NotReallyASpy"
        }
      }
    }
  }
}


OUTPUT of fromArray() *with* OPTIONAL 'attributes' options set (for spy:id, email:location, hair:length, type, color)
<?xml version="1.0"?>
 <spies>
  <spy id="007" type="SuperSpy">
   <name> James Bond </name>
   <email> mi5@london.uk </email>
   <address> Wherever he is needed most </address>
  </spy>
  <spy id="6" type="RetiredSpy">
   <name> Number 6 </name>
   <email type="private" location="office"> mi6@london.uk </email>
   <address> 123 Island Prison Lane </address>
  </spy>
  <spy id="13" type="NotReallyASpy">
   <name> Inspector Gadget </name>
   <email> lost@aol.com </email>
   <friends>
    <friend>
     <name>
      <first> little </first>
      <last> girl </last>
     </name>
     <age> 12 </age>
     <hair color="brown" length="long" />
    </friend>
    <friend>
     <name>
      <first> smelly </first>
      <last> dog </last>
     </name>
     <age> 14 </age>
     <hair color="dirtry blond" length="short" />
    </friend>
   </friends>
  </spy>
 </spies>