[java] xml

[mickey]

Hello,
I'm on Java and I put a xml in a dom. Now I need to check that all "mytag" as a ddiferent "id" value:

<xml........................>
  <mttag id="one"............./>
  <mttag id="two"............./>
  <mttag id="one"............./> //--error
  <mttag id="three".............>
          <mttag id="three.one"............./>
          <mttag id="three.one"............./> //--error
  </mtag>

<xml........................>
  <mttag id="one"............./>
  <mttag id="two"............./>
  <mttag id="one"............./> //--error
  <mttag id="three".............>
          <mttag id="three.one"............./>
          <mttag id="three.one"............./> //--error
  </mtag>

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How can I check it?
thanks,