The input schema for a Java Emitter Template (JET) transformation describes
the input that a transformation expects.
When
you create a JET transformation project, the New Project wizard
creates an input schema with a root element. You can also import an
existing input schema into an existing JET project. Existing schemas
are Eclipse Modeling Framework core (Ecore) files with the name input.schema
in the root of a JET project. Using
a valid transformation input schema ensures that the input to the
transformation is structurally correct, and enables transformation
users to create input with fewer syntax or semantic errors.