Work at SourceForge, help us to make it a better place! We have an immediate need for a Support Technician in our San Francisco or Denver office.


Gellish - A Product Modeling Language / News: Recent posts

Gellish Wiki

The Gellish Wiki is migrated to the Hosted Apps: Trac.
Also available via:

Posted by Andries van Renssen 2009-08-03

Gellish English Dictionary Aug 2008

The Gellish Dictionary version 8 (Aug 2008) is published (see the Download area).
Version 8 has extended semantic expression capabilities, for example:
- Relation types for the expression of facts that are by definition the case.
- Relation types for the definition of functions and roles in occurrences and roles of people inprojects.
- Relation types that support data modelling. This enables to specify conceptuel data models in Gellish, that can be used by generic software to create instances, thus eliminating the need for conventional data base design.
- Relation types to specify additional facts about documents and their structure, authors, etc.... read more

Posted by Andries van Renssen 2008-08-09

CROW selects Gellish as their knowledge modelling language

The Dutch organisation for infrastructure (including roads, railways, and public space) has selected the knowledge modelling language Gellish as their preferred language for conversion of knowledge that is currently contained in documents and textual specification manuals into computer interpretable knowledge. By doing so, CROW expects to remain at the forefront of selling state of the art knowledge and to prepare themselves for the era of the semantic web.
CROW selected Gellish because of its expression power, its relative simple structure, its opennesss for extensions and its robustness in view of future changes in technology.

Posted by Andries van Renssen 2007-07-30

PhD on the Gellish language

On September 14, 2005 Andries van Renssen got his PhD degree at the Delft University of Technology on a thesis called: Gellish, A generic extensible ontological language - Design and application of a universal data structure. A summary of the thesis in English and Dutch is available on this website (see 'Files'). The full thesis can be ordered via or downloaded via (Updates of Appendix A and B are available via this website as sheets in the TOPini file).

Posted by Andries van Renssen 2006-07-14

January 2007 release content

The January 2007 release contains the following files:
Part 0:
- Upper ontology (TOPini) with a definition of relation types, their required roles and the objects that can play those roles. All three are arranged in their own subtype/supertype hierarchy, starting with a common root object, called anything.
- TOPini-extensions, which contains additional relations between concepts in TOPini, especially relations that specify which relation types should be used to create facts about individual objects as guided by knowledge (relations between kinds of things).
Part 1:
- Activities, events and processes.
- Aspects, properties, qualities and roles of things & correlations and laws.
- Documents and identification of things.
- General physical objects, facilities, systems, static equipments, heat transfer equipment and civil and structural engineering & architectural and buildings.
Part 2:
- Materials of construction, substances, solid and fluid materials.
- Geographical objects, life forms and organizations.
- Electrical items, instrumentation, control, valves and IT hardware and software.
Part 3:
- Piping, connections and protection materials
- Mathematics and shapes.
- Qualitative aspects (property values) and qualitative information.
Part 4:
- Rotating equipment, electrical machines, transport and solids handling.
- Symbols and annotation.
- Units of measure (ASCII and Unicode) and scales.
- Roles of aspects (new!).
This includes roles that are played by aspects, especially when being possessed by a kind of physical object. For example, ‘bearing diameter’. This is not a subtype of diameter, but a role of a diameter when being possessed by a bearing. These roles are required e.g. when data in existing systems are mapped or when constraints are specified that are not generally valid for the aspect, but only in the context of being possessed by a particular kind of thing. ... read more

Posted by Andries van Renssen 2006-07-14

Open Source Data for Open Source Software

Open Source standard data.

Open Source generally means Open Source Software, but now the Gellish English Language
definition release extends the Open Source software community to Open Source Data. This
creates new opportunities for system independent computer interpretable data exchange.

The Gellish project released Open Source Standard Data in the form of a Gellish English
Dictionary, Taxonomy, Ontology and Knowledge base for the Semantic Web.
See: read more

Posted by Andries van Renssen 2005-06-10

Gellish English Usage Guidelines & Examples released

Guidelines for the application of Gellish English released in the download area.

Various files with Guides on the use of Gellish English are now released, together with
examples of Gellish usage in the form of Gellish Tables about individual products, product requirement specifications and modeled knowledge. For example a lubrication oil system and the specification of a road.

Gellish English is a neutral system independent data exchange language. It contains a
computer interpretable Open Source English Dictionary, Taxonomy, Ontology and
Knowledge base.... read more

Posted by Andries van Renssen 2005-06-10

Help wanted: Engineering disciplines domain experts

Domain experts are wanted in various disciplines to participate in peer groups in their discipline. Each peer group will raise and discuss proposals for extension or improvement of the Gellish Dictionary / Taxonomy.

Posted by Andries van Renssen 2005-01-13

Foundation of the Gellish Forum

In December 2004 the Gellish Forum was founded. Its members ensure the quality of the Gellish language. The Forum has the authority to approval proposals for inclusion in the Gellish Language Definition.

Posted by Andries van Renssen 2005-01-13