Extended XQL Examples

• Combination:

  • combine all books with customers via isbn$root//*?/book?[$i:=isbn]/ (* | $root//customer?[boughtbooks/isbn=$i])
  • New concepts
    • combination with nodes outside of search context ($root//review)
    • correlation variables for expressing join predicate [$i:=isbn]
    • $root used for clarity...
  • Irregular structure of bookstore is preserved

• Multidocuments/Delegation:

  • get multiple bookstores from a bookmark list (HTTP-GET)docref('http://www.bookstores')/docref(.//@href)//bookstore
  • the same with a form (HTTP-POST - simplified!)docref ('http://www.bookstores/search.cfm',‘country',‘us')//bookstore
  • the same with a wrapper (application program delivering XML)wrapper(„bookstore“)//bookstore

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