Return a if statement : return « XQuery « XML

1. XML
2. XQuery
3. return

Return a if statement

File: Data.xml


<?xml version="1.0"?>
<bib>
  <book year="1988">
    <title>title 1</title>
    <author>
      <last>A</last>
      <first>B</first>
    </author>
    <author>
      <last>C</last>
      <first>D</first>
    </author>
  </book>

  <book year="2004">
    <title>title 2</title>
    <author>
      <last>E</last>
      <first>F</first>
    </author>
  </book>
</bib>


File: Query.xquery
<MultiAuthor>
{for $book in doc("Data.xml")/bib/book
return  if (count($book/author) gt 2)
  then <book>
        <title>{$book/title/text()}</title>
        <idOfAuthors>{count($book/author)}</idOfAuthors>
       </book>
  else ()
}
</MultiAuthor>


Output:

<?xml version="1.0" encoding="UTF-8"?>
<MultiAuthor/>

 

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