Boolean logic rule evaluator

true

<rule id="1">
   <question id="123" answer="true" />
   <question id="124" answer="false" />
   <choice id="1">
      <question id="125" answer='true' />
      <choice id="2">
         <question id="126" answer='false' />
         <question id="127" answer='false' />
      </choice>
   </choice>
</rule>

bool IsRuleSatisfied(XmlElement rule)
 {
    bool satisfied = true;
    foreach (XmlElement child in rule.SelectNodes("*"))
    {
       if (child.Name == "question")
       {
          satisfied = satisfied && IsQuestionCorrect(child);
       }
       if (child.Name == "choice")
       {
          satisfed = satisfied && IsChoiceCorrect(child);
       }
       if (!satisfied)
       {
          return false;
       }
   }
   return true;
}