==GDS ==

* source svn checkout  http://gdsparal.googlecode.com/svn/trunk/ gdsparal-read-only

gdsparal - Revision 7: /trunk

Compiling failed. It seemed that the source code is incomplete.

==DARQ ==

1. The source code is temperately unavailable.

2. The project has not been updated since 2006.

3. The project announced the following limitations of DARQ system:

Limitations and known issues:

1. DARQ is in an early stage of development. No extensive testing has been performed.

2. Since DARQ uses predicates to decide where to send triple patterns, no ?s ?p ?o queries are supported - predicates must be bound.

3. Joins using Blank nodes are not supported. If a join operation finds a blank node an exception will be thrown.

4. DESCRIBE is not supported.

5. GRAPH is not supported.

6. Query optimization is not very good and will not support many endpoints or triples.