@INPROCEEDINGS{EfftingeEtAl12GPCE,
author       = {Efftinge, S. and Eysholdt, M. and K\"ohnlein, J. and Zarnekow, S. and Hasselbring, W. and von Massow, R. and Hanus, M.},
title        = {Xbase: Implementing Domain-Specific Languages for Java},
year         = {2012},
booktitle    = {Proceedings of the 11th International Conference on
                Generative Programming and Component Engineering (GPCE'12)},
pages        = {112-121},
publisher    = {ACM Press},
abstract = {
Xtext is an open-source framework for implementing external, textual
domain-spec ific languages (DSLs).  So far, most DSLs implemented with
Xtext and similar tools focus on structural a spects such as service
specifications and entities.  Because behavioral aspects are
significantly more complicated to implement, they are often delegated
to general-purpose programming languages. This approach int roduces
complex integration patterns and the DSL's high level of abstraction
is compromised.

We present Xbase as part of Xtext, an expression language that can be
reused via language inheritance in any DSL implementation based on
Xtext. Xbase expression s provide both control structures and program
expressions in a uniform way.  Xbase is statically typed and tightly
integrated with the Java type system. Lang uages extending Xbase
inherit the syntax of a Java-like expression language as well as
language infrastructure components , including a parser, an unparser,
a linker, a compiler and an interpreter. Furt hermore, the framework
provides integration into the Eclipse IDE including debug and
refactoring support.

The application of Xbase is presented by means of a domain model
language which serves as a tutorial example and by the implementation
of the programming langua ge Xtend.  Xtend is a functional and
object-oriented general purpose language for the Java Virtual Machine
(JVM). It is built on top of Xbase which is the reusable express ion
language that is the foundation of Xtend.
}
}