如何在REST中传递复杂的查询?

<xml>
  <service>account</service>
  <resource>invoice</resource>
  <action>query</action>
  <parameters>
    <page>1</page>
    <page_len>10</page_len>
    <order>date</order>
    <fields>*</fields>
    <conditions>
      <date>2009-01-01..2009-01-31</date>
      <customer_id>24</customer_id>
    </conditions>
  </parameters>
</xml>

http://account/invoice/?_page=1&_page_len=10&_order=date&_fields=*&date=2009-01-01..2009-01-31&customer_id=24

[...]
    <_order>date</_order>
    <_fields>*</_fields>
    <date>2009-01-01..2009-01-31</date>
    <customer_id>24</customer_id>
[...]