DRAGOS is a database system which is developed according to the requirements of software systems for special application areas. This includes integrated development environments, case tools, re- and reverse engineering tools and other interactive applications using complex object structures. Common for these applications is the necessity to handle different types of objects on different levels efficiently: Coarse- and fine-grained objects (documents and paragraphs), hierarchical and non-hierarchical relations between them (compositions and cross references) and a vast number of differently sized attributes (chapter numbers and images) efficiently.
The predecessors of the DRAGOS project have been used in various projects at different sites. For more informations see the homepage of the GRAS project
This site contains the DRAGOS project documentation. If you came from our department website and wish to go back, click here.
Unlike the previous GRAS versions (e.g. RGRAS and GRAS3) DRAGOS utilizes third-party databases for storing graphs efficiently. Currently, three different graph storages are supported:
Subsequent releases will support other object-oriented and relational databases. Due to the service-oriented architecture of DRAGOS these graph storages can be developed and released indendently.
Another difference between DRAGOS and its predecessors is the graph model. RGRAS and GRAS3 only supported a very limited graph model, e.g. n-ary and attributed relations were not support. The graph model of DRAGOS supports the following graph constructs:
Compared to its predecessors DRAGOS offers only a very limited functionality. For example, neither incremental evaluation of attribute values nor undo/redo is supported. The support for this functionality has been moved from the DRAGOS Kernel to extension modules. This avoids performance pentalties in applications which do not require this functionality. At the moment the following extension modules exist:
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