Milestone M5 of the OT changes from Ant 1.7 to Ant 1.8 and no longer uses the Xerces bundled with Ant. This breaks running the Toolkit from within Oxygen because the right Xerces library isn't found: /Applications/oxygen/frameworks/dita/DITA-OT/plugins/org.dita.base/build_pre process.xml:27: java.lang.NoSuchMethodError: org.apache.xerces.impl.xs.SubstitutionGroupHandler.<init>(Lorg/apache/xerces /impl/xs/XSGrammarBucket;)V at org.apache.xerces.impl.xs.XMLSchemaValidatorXerces.<init>(Unknown Source) Is there a way to locally update the classpath Oxygen uses in order to pick up the right Xerces jar? Note that I've simply replace the as-installed DITA-OT distribution with the 1.5.6M5 distribution swapping it into the directory DITA-OT. Cheers, E. -- Eliot Kimber Senior Solutions Architect, RSI Content Solutions "Bringing Strategy, Content, and Technology Together" Main: 512.554.9368 www.rsicms.com www.rsuitecms.com Book: DITA For Practitioners, from XML Press, http://xmlpress.net/publications/dita/practitioners-1/