eXist 1.3 and OxygenXML

Here's the complete list of drivers needed to establish recent eXist 1.2.5(dev) and 1.3 builds to oXygen as a data source (via oXygen's Options -- Preferences -- Data Sources -- Data Sources -- eXist -- Data Sources Drivers):

• exist/exist.jar
• exist/lib/core/xmldb.jar
• exist/lib/core/xmlrpc-client-3.1.1.jar
• exist/lib/core/xmlrpc-common-3.1.1.jar
• exist/lib/core/ws-commons-util-1.0.2.jar

source: Mailinglist

For the older eXist 1.2 versions the instructions are found here and here.