Examples

The examples below require some XML documents to be stored in the database. If you have not yet imported these files, go to Examples Setup.

XQueryServlet (just eXist, no Cocoon)

XQuery Sandbox	A web interface to execute XQueries on the server. Uses AJAX technology to validate your XQuery while you type. Requires Javascript to be enabled. Demonstrates more advanced techniques for writing web applications with XQuery, XML/HTML, CSS and Javascript.
Guess a Number	Simple number guessing game to illustrate different servlet features.
XQuery Function Library Search	The search interface for XQuery functions demonstrates usage of the NGram index or AJAX. The function documentation is generated once from the Java classes and stored in XQDoc format.
Search the Documentation	A not too complex example featuring full text queries and post-processing of query results to show keywords in context.
Built-in functions	A simple example which lists all functions in the built-in XQuery function library. It uses the transform function to transform XML output into HTML using an XSL stylesheet (also check the function search interface.
Simple HTML Example	Prints a table in HTML with 10x10 cells.
Fibonacci	Calculates the first 10 Fibonacci numbers.
XML Acronyms	XQuery version of the XML Acronym Demystifier, entirely implemented in XQuery.
Session example	Presents a login page. Only valid database users can log in. User and password are stored in the HTTP session.
Basic form example	Presents a form page. The response echoes the name entered.
Form example with XUpdate	Presents a form page. The response echoes all the names entered since database creation.
Twitter client	A simple twitter client, which demonstrates how to use the http client library to retrieve XML data from external data sources. For a more complex twitter example, see an article published on DevX.
First-class functions example	Demonstrates the use of first-class functions. First-class functions are supported through the eXist-specific extension functions: util:function and util:call.
W3C XQuery Test suite (XQTS)	Using this web application you can run the official XQuery test suite on eXist. You will need to download the test suite data (read the notice shown when you first access the page). The test runner is entirely written in XQuery and is a good example for a complex script using lots of AJAX.
Transform XML fragments to JSON	An XQuery does not necessarily need to return XML.
URL Rewriting	eXist's XQueryURLRewrite servlet filter calls a user-defined XQuery to decide how a HTTP request is handled. The XML fragment returned by the query determines how the request is processed. This happens transparently to the client. One or more "views" can be applied to a request to further processes it. This is how most of the pages here are rendered (except the Cocoon examples). Have a look the main controller XQuery, which resides in webapp/controller.xql.
Bibliography 2	Another bibliographic demo from previous releases of eXist. No AJAX.

Misc Examples

XInclude Sample Document	Dynamically generates a page out of the database by expanding XInclude tags found in the source document.
Retrieve a document through REST	Retrieves a document through the REST-style API. The document contains an XSL processing instruction. The XSL stylesheet is read from the database and applied to the output. Please note that also the CSS file referenced by the HTML output is loaded from the database.

Cocoon Examples

These are older examples based on different Cocoon features. Some of the examples have been rewritten in XQuery, so there are now two versions of these. Please note: the demonstrated features, in particular: XSP and the XML:DB transformer, are still functional, but not actively maintained!

Bibliography	A bibliographic demo, based on the MODS bibliographic format, which is maintained by the Library of Congress. Shows session handling and user authentication as well as some AJAX goodies.
Cocoon XML:DB Pseudo-Protocol
Cocoon-based Database Browser	A database browser which uses Cocoon's xmldb:// pseudo-protocol and XSL stylesheets for the rendering.
eXist's XSP Logicsheet
XML Acronyms	An XSP-based version of the XML Acronym Demystifier

External Examples

AtomicWiki

AtomicWiki is a combined Wiki and Weblog entirely written in XQuery (and some XSLT) and using XQuery as a scripting language within Wiki entries and Blog posts.