Few Words on XML Query

• XPath is also reused in XML Query
  • SQL-like language to query databases and return data in XML
  • eg, retrieve all mobile numbers for W3C:

for $a in document("AllAddresses.xml")/Team

    let $b := $a/@file

        for $c in $b=>//Addresses/Person[Tel/@where = 'mobile']

            return

               <dt>{ $c/Name }</dt>

               <dd>{ $c/Tel[@where = 'mobile'] }</dd>

• XML Query and XPath (2.0) are developed together
  • e.g., inclusion of XML Schema datatype handling
  • (but is still under development...)