How to read xml childs from a closed tag parent in c#

I know how to read normal xml files with c# using XmlDocument. But this time the xml file is different, this is the structure:

<year>2010</year>
  <value>20000</value>
  <exp>k(x + y)/m</exp>
  <item>30</item>
    <law>Ley 10, art. 40</law>
    <law>Ley 10, art. 50</law>
  <item>140</item>
    <law>Ley 10, art. 40</law>
  <year>2011</year>

As you can see, year is the parent node of value, exp and item and item is the parent of law childs. So this is not like the normal

<parent> <child>a</child> </parent>

xml file structure. Can you please give me a hint. Thanks.