I apologize - the XML example I provided was not valid. I attempted to abstract the actual XML because it's much bigger and I wanted to simplify it for this post. But I did a poor job. The following appears to pass a validator:

<AccountDetailsRsp AccountNum="1" AccountStatus="AccountStatus1">

<PlayerInfo PlayerID="1" FirstName="FirstName1" LastName="LastName1">

<AddressList>

<PlayerAddress>

<Address AddressType="primary" City="City1" State="State1" Zip="Zip1"/>

<FutureUse />

<Phone PhoneNumber="PhoneNumber1" PhoneType="Type1" />

<Phone PhoneNumber="PhoneNumber2" PhoneType="Type2" />

</PlayerAddress>

<PlayerAddress>

<Address AddressType="billing" City="City1" State="State1" Zip="Zip1"/>

<FutureUse />

<Phone PhoneNumber="PhoneNumber1" PhoneType="Type1" />

<Phone PhoneNumber="PhoneNumber2" PhoneType="Type2" />

</PlayerAddress>

</AddressList>

</PlayerInfo>

</AccountDetailsRsp>