求个循环读取xml某个可能嵌套的节点的方式

xml文档如下(精简过):
    <organization identifier="golf_sample_default_org" adlseq:objectivesGlobalToSystem="false">
      <title>Golf Explained - Simple Remediation</title>      <item identifier="content_wrapper" isvisible="false">
        <title>Remediation Wrapper</title>        <item identifier="playing_item" identifierref="playing_resource">
          <title>Playing the Game</title>
          <imsss:sequencing IDRef="content_seq_rules">          </imsss:sequencing>
        </item>
        <item identifier="etuqiette_item" identifierref="etiquette_resource">
          <title>Etiquette</title>
          <imsss:sequencing IDRef="content_seq_rules">          </imsss:sequencing>
        </item>
        <item identifier="handicapping_item" identifierref="handicapping_resource">
          <title>Handicapping</title>
          <imsss:sequencing IDRef="content_seq_rules">          </imsss:sequencing>
        </item>
        <item identifier="havingfun_item" identifierref="havingfun_resource">
          <title>Having Fun</title>
          <imsss:sequencing IDRef="content_seq_rules">          </imsss:sequencing>
        </item>
        <imsss:sequencing>
          <imsss:controlMode choice="false" flow="true" choiceExit="false"/>          <imsss:sequencingRules>
          </imsss:sequencingRules>        </imsss:sequencing>
      </item>      <imsss:sequencing>
        <imsss:controlMode choice="false" flow="true" />
      </imsss:sequencing>
    </organization>一级一级的取得相应的xml内容,但是不包含儿子item内(包括儿子item自己)的xml内容.比如:取得第一个xml的内容应该如下:
    <organization identifier="golf_sample_default_org" adlseq:objectivesGlobalToSystem="false">
      <title>Golf Explained - Simple Remediation</title>     
      <imsss:sequencing>
        <imsss:controlMode choice="false" flow="true" />
      </imsss:sequencing>
    </organization>
取得的第二个xml的内容应该如下:      <item identifier="content_wrapper" isvisible="false">
        <title>Remediation Wrapper</title>
        <imsss:sequencing>
          <imsss:controlMode choice="false" flow="true" choiceExit="false"/>          <imsss:sequencingRules>
          </imsss:sequencingRules>        </imsss:sequencing>
      </item>
取得的第三个xml的内容应该如下:
  <item identifier="playing_item" identifierref="playing_resource">
          <title>Playing the Game</title>
          <imsss:sequencing IDRef="content_seq_rules">          </imsss:sequencing>
        </item>XMLHTML