This document discusses XQuery and how it can be used for web applications. It addresses some common misconceptions about XQuery, such as that it is not a scripting language, has no application server, lacks open source tools, and has no utility functions for the web. It then introduces Sausalito, an open source XQuery application server, and describes some of its features like the AtomPub module and utility functions across many modules that enable building web applications with XQuery in the cloud.

1. XQuery in the Cloud
Cutting Edge Web Applications with
XQuery and Sausalito
William Candillon {william.candillon@28msec.com}

2. PHP & XQuery

3. A Complementary Couple?

4. Some Misconceptions
• XQuery:
- is not a scripting language
- has no application serveur
- has no open source development tools
- has no utility functions for the Web

5. Some Misconceptions
• XQuery:
- is not a scripting language
- has no application serveur
- has no open source development tools
- has no utility functions for the Web

6. Some Misconceptions
XQuery is not a
scripting language!

7. XQuery Scripting (WC3)
• XQuery Scripting Extension 1.0 and XQuery Update Facility 1.0
• Imperative programming
declare function sequential local:hello-world() {
declare $hello := "Hello";
declare $world := "World";
exit with concat($hello, " ", $world);
}
• Side-effects
replace value of $client/@id with "foo";
• Loops
while(true()) { server:handle() }

8. XQuery Scripting (Zorba)
• Try/Catch
try { 3 + "2" } catch * { "Caught an error" }
• Eval
let $x := "21" return using $x
eval { concat($x, "+ xs:double ($x)") }
• Command-line Input/Output
let $name := util:read-line()
return util:print("Hello", $name)

9. Some Misconceptions
XQuery has no
Application Server

10. Sausalito
• XQuery Application Server based on Zorba XQuery Processor
and Amazom Cloud Computing Stack
• Success Story: http://doodlendar.my28msec.com

11. Some Misconceptions
XQuery has no
Open Source Tools

12. XQuery Development Tools
http://www.eclipse.org/webtools/incubator/

13. Some Misconceptions
XQuery has no utility
functions for the Web

14. Utility Functions
More than 28 modules in Sausalito library
- HTTP - AtomPub - Collections
- REST - Captchas - Strings
- Security - AtomPub - Maths
- Sessions - Emails - Media
- OAuth - Serializer - Etc...

15. AtomPub Module
• Compliant with RFC 5023
• AtomPub Server for the Cloud
declare function atom:entries(){
atompub:handle($serviceDocument)
};
• Atom Store
atomstore:new-feed("/atom/entries",
<a:feed><a:title>Demo Blog</a:title></a:feed>);
• Model helpers
declare $e := f:new-entry(util:uuid(), "XQuery Meetup");
f:set-content($e, f:new-content("Go for a drink with XML/
XQuery lovers!"))

16. Thank You!
Questions ?
contact@28msec.com
More info
http://sausalito.28msec.com
Because green is the new blue...

17. Take it for a ride
http://try.zorba-xquery.com