  Recent advances in the area of legal information systems have led to a
variety of applications that promise support in processing and accessing legal
documents. Unfortunately, these applications have various limitations, e.g.,
regarding scope or extensibility. Furthermore, we do not observe a trend
towards open access in digital libraries in the legal domain as we observe in
other domains, e.g., economics of computer science. To improve open access in
the legal domain, we present our approach for an open source platform to
transparently process and access Legal Open Data. This enables the sustainable
development of legal applications by offering a single technology stack.
Moreover, the approach facilitates the development and deployment of new
technologies. As proof of concept, we implemented six technologies and
generated metadata for more than 250,000 German laws and court decisions. Thus,
we can provide users of our platform not only access to legal documents, but
also the contained information.
