See:
Description

JET
org.eclipse.jet: Defines core interfaces for executing JET transformations and templates.
org.eclipse.jet.compiler: Defines an AST for JET templates, and provides a compiler that generates an AST from a template source.
org.eclipse.jet.runtime.model: Defines interfaces for loading models into memory for access by JET templates (incomplete).
org.eclipse.jet.taglib: Interfaces and abstract classes for implement custom JET tags.
org.eclipse.jet.taglib.java: Define utility functions for interacting with the Standard JET Java tags.
org.eclipse.jet.taglib.workspace: Defines JET workspace actions that custom tags may perform as part of a JET transformation.
org.eclipse.jet.transform: Defines JET transformation related interfaces.
org.eclipse.jet.xpath: The JET XPath processor.
org.eclipse.jet.xpath.inspector: Interfaces allowing in-memory models to be handled by the JET XPath processor.

Other Packages
org.eclipse.jet.ui
org.eclipse.jet.ui.newproject

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