our data is like in the following structure
<article>...<coden></coden><volume></volume><issue></issue><paper></ paper>....</article>

the following are examples of the data, each tag <article> means one xml in marklogic:

article 1:
<article>...<coden>AAA</coden><volume>1</volume><issue>1</ issue><paper>123</paper>....</article>
article 2:
<article>....<coden>AAA</coden><volume>1</volume><issue>2</ issue><paper>233</paper>....</article>
article 3:
<article>....<coden>AAA</coden><volume>2</volume><issue>3</ issue><paper>355</paper>....</article>
article 4:
<article>....<coden>ACD</coden><volume>5</volume><issue>2</ issue><paper>899</paper>....</article>
article 5:
<article>....<coden>ABC</coden><volume>1</volume><issue>3</ issue><paper>667</paper>....</article>


I want to build a tree list based on coden

coden
     volume
        issue


so based on the above example data, if I say I want to build the tree for coden AAA, I should get:
AAA
   vol 1
     iss1
     iss 2
  vol 2
      iss 3

Any suggestions on how to build it using marklogic?

Thanks, Helen
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