https://www.linuxtopia.org/online_books/eclipse_documentation/eclipse_jet_development_guide/topic/org.eclipse.jet.doc/references/javadoc/org/eclipse/jet/taglib/eclipse_jet_ConditionalTag.html
Eclipse JET Guide (Galileo) - ConditionalTag (JET Javadoc)
Eclipse JDT Plugin Development Guide
jet guideeclipsegalileojavadoc