Use Case

      for $a in doc("bib.xml")/bib
          $b in $a/book
      where $b/publisher = Addison-Wesley
            and $b/year > 1991
      return $a/book

Use Case Q1: Visual XQuery Graph

      for $a in doc("bib.xml")/bib
          $b in $a/article
          $c in $a/book
      where $b/publisher = "Great_Books"
            and $b/author = $c/author
      return $b/title $c/title

Use Case Q2: Visual XQuery Graph

Q3: "List titles of book published by Great_Books and article whereby the author has written in both media". It translates to the following XQuery statement.

for $a in doc("bib.xml")/bib, 
 $b in $a/article, 
 $c in $a/book
 where $b/publisher = "Morf mann"
 and $b/author = $c/author
 return $b/title, $c/title

Query 3 is similar to query 2 except the addition of the group node to ease user's visualization of the graph as the graph gets more complicated with the addition of more nodes and edges. The feature works similar to an element node except that it is connected to an incoming edge that has no edge label which symbolizes that the node is a group node as circled in blue .

Use Case Q3: Visual XQuery Graph (Group Node)

 

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Last Updated: 03 May 2007