XQuery Extension Modules - eXist: A NoSQL Database and Application Development Platform - page 521

This module doesn't follow the normal pattern for Java modules: it does not register a
default namespace prefix. You'll have to add import module namespace
xmlc="http://xmlcalabash.com"; at the top of your script (which is good practice
anyway) to be able to call xmlc:process .
xmldb
Description
Core module for working with the database
Namespace
xmldb="http://exist-db.org/xquery/xmldb"
Type/default status
Java; enabled in $EXIST_HOME/conf.xml
Class
org.exist.xquery.functions.xmldb.XMLDBModule
This module contains all the base functions for working with the database: exploring
the database content, creating collections and resources, logging in, and so on. More
information is available in “Controlling the Database from Code” on page 107 .
xmldiff
Description
Comparing XML documents
Namespace
xmldiff="http://exist-db.org/xquery/xmldiff"
Type/default status
Java; enabled in $EXIST_HOME/conf.xml ; enabled in $EXIST_HOME/extensions/
build.properties
Class
org.exist.xquery.modules.xmldiff.XmlDiffModule
This module allows you to compare two XML documents with the xmldiff:compare
function. It only returns whether the documents are equal (not a difference list).